diff --git a/akka-http/pom.xml b/akka-http/pom.xml
new file mode 100644
index 0000000000..51e70fb583
--- /dev/null
+++ b/akka-http/pom.xml
@@ -0,0 +1,48 @@
+
+
+
+ 4.0.0
+ akka-http
+ akka-http
+
+
+ parent-modules
+ com.baeldung
+ 1.0.0-SNAPSHOT
+
+
+
+
+ com.typesafe.akka
+ akka-http_2.12
+ ${akka.http.version}
+
+
+ com.typesafe.akka
+ akka-stream_2.12
+ 2.5.11
+
+
+ com.typesafe.akka
+ akka-http-jackson_2.12
+ ${akka.http.version}
+
+
+ com.typesafe.akka
+ akka-http-testkit_2.12
+ ${akka.http.version}
+ test
+
+
+
+
+ UTF-8
+ UTF-8
+ 1.8
+ 10.0.11
+ 2.5.11
+
+
diff --git a/akka-http/src/main/java/com/baeldung/akkahttp/User.java b/akka-http/src/main/java/com/baeldung/akkahttp/User.java
new file mode 100644
index 0000000000..43c21eca62
--- /dev/null
+++ b/akka-http/src/main/java/com/baeldung/akkahttp/User.java
@@ -0,0 +1,26 @@
+package com.baeldung.akkahttp;
+
+public class User {
+
+ private final Long id;
+
+ private final String name;
+
+ public User() {
+ this.name = "";
+ this.id = null;
+ }
+
+ public User(Long id, String name) {
+ this.name = name;
+ this.id = id;
+ }
+
+ public String getName() {
+ return name;
+ }
+
+ public Long getId() {
+ return id;
+ }
+}
\ No newline at end of file
diff --git a/akka-http/src/main/java/com/baeldung/akkahttp/UserActor.java b/akka-http/src/main/java/com/baeldung/akkahttp/UserActor.java
new file mode 100644
index 0000000000..431014a88b
--- /dev/null
+++ b/akka-http/src/main/java/com/baeldung/akkahttp/UserActor.java
@@ -0,0 +1,41 @@
+package com.baeldung.akkahttp;
+
+import akka.actor.AbstractActor;
+import akka.actor.Props;
+import akka.japi.pf.FI;
+import com.baeldung.akkahttp.UserMessages.ActionPerformed;
+import com.baeldung.akkahttp.UserMessages.CreateUserMessage;
+import com.baeldung.akkahttp.UserMessages.GetUserMessage;
+
+
+class UserActor extends AbstractActor {
+
+ private UserService userService = new UserService();
+
+ static Props props() {
+ return Props.create(UserActor.class);
+ }
+
+ @Override
+ public Receive createReceive() {
+ return receiveBuilder()
+ .match(CreateUserMessage.class, handleCreateUser())
+ .match(GetUserMessage.class, handleGetUser())
+ .build();
+ }
+
+ private FI.UnitApply handleCreateUser() {
+ return createUserMessageMessage -> {
+ userService.createUser(createUserMessageMessage.getUser());
+ sender().tell(new ActionPerformed(String.format("User %s created.", createUserMessageMessage.getUser()
+ .getName())), getSelf());
+ };
+ }
+
+ private FI.UnitApply handleGetUser() {
+ return getUserMessageMessage -> {
+ sender().tell(userService.getUser(getUserMessageMessage.getUserId()), getSelf());
+ };
+ }
+
+}
diff --git a/akka-http/src/main/java/com/baeldung/akkahttp/UserMessages.java b/akka-http/src/main/java/com/baeldung/akkahttp/UserMessages.java
new file mode 100644
index 0000000000..995b92bcb0
--- /dev/null
+++ b/akka-http/src/main/java/com/baeldung/akkahttp/UserMessages.java
@@ -0,0 +1,49 @@
+package com.baeldung.akkahttp;
+
+import java.io.Serializable;
+
+public interface UserMessages {
+
+ class ActionPerformed implements Serializable {
+
+ private static final long serialVersionUID = 1L;
+
+ private final String description;
+
+ public ActionPerformed(String description) {
+ this.description = description;
+ }
+
+ public String getDescription() {
+ return description;
+ }
+ }
+
+ class CreateUserMessage implements Serializable {
+
+ private static final long serialVersionUID = 1L;
+ private final User user;
+
+ public CreateUserMessage(User user) {
+ this.user = user;
+ }
+
+ public User getUser() {
+ return user;
+ }
+ }
+
+ class GetUserMessage implements Serializable {
+ private static final long serialVersionUID = 1L;
+ private final Long userId;
+
+ public GetUserMessage(Long userId) {
+ this.userId = userId;
+ }
+
+ public Long getUserId() {
+ return userId;
+ }
+ }
+
+}
diff --git a/akka-http/src/main/java/com/baeldung/akkahttp/UserServer.java b/akka-http/src/main/java/com/baeldung/akkahttp/UserServer.java
new file mode 100644
index 0000000000..0c1dbd1f60
--- /dev/null
+++ b/akka-http/src/main/java/com/baeldung/akkahttp/UserServer.java
@@ -0,0 +1,70 @@
+package com.baeldung.akkahttp;
+
+import java.util.Optional;
+import java.util.concurrent.CompletionStage;
+import java.util.concurrent.TimeUnit;
+
+import akka.actor.ActorRef;
+import akka.actor.ActorSystem;
+import akka.http.javadsl.marshallers.jackson.Jackson;
+import akka.http.javadsl.model.StatusCodes;
+import akka.http.javadsl.server.HttpApp;
+import akka.http.javadsl.server.Route;
+import akka.pattern.PatternsCS;
+import akka.util.Timeout;
+import com.baeldung.akkahttp.UserMessages.ActionPerformed;
+import com.baeldung.akkahttp.UserMessages.CreateUserMessage;
+import com.baeldung.akkahttp.UserMessages.GetUserMessage;
+import scala.concurrent.duration.Duration;
+import static akka.http.javadsl.server.PathMatchers.*;
+
+class UserServer extends HttpApp {
+
+ private final ActorRef userActor;
+
+ Timeout timeout = new Timeout(Duration.create(5, TimeUnit.SECONDS));
+
+ UserServer(ActorRef userActor) {
+ this.userActor = userActor;
+ }
+
+ @Override
+ public Route routes() {
+ return path("users", this::postUser)
+ .orElse(path(segment("users").slash(longSegment()), id ->
+ route(getUser(id))));
+ }
+
+ private Route getUser(Long id) {
+ return get(() -> {
+ CompletionStage> user = PatternsCS.ask(userActor, new GetUserMessage(id), timeout)
+ .thenApply(obj -> (Optional) obj);
+
+ return onSuccess(() -> user, performed -> {
+ if (performed.isPresent())
+ return complete(StatusCodes.OK, performed.get(), Jackson.marshaller());
+ else
+ return complete(StatusCodes.NOT_FOUND);
+ });
+ });
+ }
+
+ private Route postUser() {
+ return route(post(() -> entity(Jackson.unmarshaller(User.class), user -> {
+ CompletionStage userCreated = PatternsCS.ask(userActor, new CreateUserMessage(user), timeout)
+ .thenApply(obj -> (ActionPerformed) obj);
+
+ return onSuccess(() -> userCreated, performed -> {
+ return complete(StatusCodes.CREATED, performed, Jackson.marshaller());
+ });
+ })));
+ }
+
+ public static void main(String[] args) throws Exception {
+ ActorSystem system = ActorSystem.create("userServer");
+ ActorRef userActor = system.actorOf(UserActor.props(), "userActor");
+ UserServer server = new UserServer(userActor);
+ server.startServer("localhost", 8080, system);
+ }
+
+}
diff --git a/akka-http/src/main/java/com/baeldung/akkahttp/UserService.java b/akka-http/src/main/java/com/baeldung/akkahttp/UserService.java
new file mode 100644
index 0000000000..50dc1e1b28
--- /dev/null
+++ b/akka-http/src/main/java/com/baeldung/akkahttp/UserService.java
@@ -0,0 +1,35 @@
+package com.baeldung.akkahttp;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.Optional;
+
+public class UserService {
+
+ private final static List users = new ArrayList<>();
+
+ static {
+ users.add(new User(1l, "Alice"));
+ users.add(new User(2l, "Bob"));
+ users.add(new User(3l, "Chris"));
+ users.add(new User(4l, "Dick"));
+ users.add(new User(5l, "Eve"));
+ users.add(new User(6l, "Finn"));
+ }
+
+ public Optional getUser(Long id) {
+ return users.stream()
+ .filter(user -> user.getId()
+ .equals(id))
+ .findFirst();
+ }
+
+ public void createUser(User user) {
+ users.add(user);
+ }
+
+ public List getUsers(){
+ return users;
+ }
+
+}
diff --git a/akka-http/src/test/java/com/baeldung/akkahttp/UserServerUnitTest.java b/akka-http/src/test/java/com/baeldung/akkahttp/UserServerUnitTest.java
new file mode 100644
index 0000000000..1170a2d761
--- /dev/null
+++ b/akka-http/src/test/java/com/baeldung/akkahttp/UserServerUnitTest.java
@@ -0,0 +1,50 @@
+package com.baeldung.akkahttp;
+
+import akka.actor.ActorRef;
+import akka.actor.ActorSystem;
+import akka.http.javadsl.model.ContentTypes;
+import akka.http.javadsl.model.HttpEntities;
+import akka.http.javadsl.model.HttpRequest;
+import akka.http.javadsl.testkit.JUnitRouteTest;
+import akka.http.javadsl.testkit.TestRoute;
+import org.junit.Test;
+
+public class UserServerUnitTest extends JUnitRouteTest {
+
+ ActorSystem system = ActorSystem.create("helloAkkaHttpServer");
+
+ ActorRef userActorRef = system.actorOf(UserActor.props(), "userActor");
+
+ TestRoute appRoute = testRoute(new UserServer(userActorRef).routes());
+
+ @Test
+ public void whenRequest_thenActorResponds() {
+
+ appRoute.run(HttpRequest.GET("/users/1"))
+ .assertEntity(alice())
+ .assertStatusCode(200);
+
+ appRoute.run(HttpRequest.GET("/users/42"))
+ .assertStatusCode(404);
+
+ appRoute.run(HttpRequest.DELETE("/users/1"))
+ .assertStatusCode(200);
+
+ appRoute.run(HttpRequest.DELETE("/users/42"))
+ .assertStatusCode(200);
+
+ appRoute.run(HttpRequest.POST("/users")
+ .withEntity(HttpEntities.create(ContentTypes.APPLICATION_JSON, zaphod())))
+ .assertStatusCode(201);
+
+ }
+
+ private String alice() {
+ return "{\"id\":1,\"name\":\"Alice\"}";
+ }
+
+ private String zaphod() {
+ return "{\"id\":42,\"name\":\"Zaphod\"}";
+ }
+
+}
diff --git a/algorithms-miscellaneous-1/README.md b/algorithms-miscellaneous-1/README.md
index a04874c4d2..a725bbd141 100644
--- a/algorithms-miscellaneous-1/README.md
+++ b/algorithms-miscellaneous-1/README.md
@@ -10,4 +10,6 @@
- [Multi-Swarm Optimization Algorithm in Java](http://www.baeldung.com/java-multi-swarm-algorithm)
- [String Search Algorithms for Large Texts](http://www.baeldung.com/java-full-text-search-algorithms)
- [Check If a String Contains All The Letters of The Alphabet](https://www.baeldung.com/java-string-contains-all-letters)
-- [Find the Middle Element of a Linked List](http://www.baeldung.com/java-linked-list-middle-element)
\ No newline at end of file
+- [Find the Middle Element of a Linked List](http://www.baeldung.com/java-linked-list-middle-element)
+- [Calculate Factorial in Java](https://www.baeldung.com/java-calculate-factorial)
+- [Find Substrings That Are Palindromes in Java](https://www.baeldung.com/java-palindrome-substrings)
\ No newline at end of file
diff --git a/java-strings/src/main/java/com/baeldung/string/SubstringPalindrome.java b/algorithms-miscellaneous-1/src/main/java/com/baeldung/algorithms/string/SubstringPalindrome.java
similarity index 98%
rename from java-strings/src/main/java/com/baeldung/string/SubstringPalindrome.java
rename to algorithms-miscellaneous-1/src/main/java/com/baeldung/algorithms/string/SubstringPalindrome.java
index 688bf43b3c..b3d142eb07 100644
--- a/java-strings/src/main/java/com/baeldung/string/SubstringPalindrome.java
+++ b/algorithms-miscellaneous-1/src/main/java/com/baeldung/algorithms/string/SubstringPalindrome.java
@@ -1,4 +1,4 @@
-package com.baeldung.string;
+package com.baeldung.algorithms.string;
import java.util.HashSet;
import java.util.Set;
diff --git a/java-strings/src/test/java/com/baeldung/string/SubstringPalindromeUnitTest.java b/algorithms-miscellaneous-1/src/test/java/com/baeldung/algorithms/string/SubstringPalindromeUnitTest.java
similarity index 98%
rename from java-strings/src/test/java/com/baeldung/string/SubstringPalindromeUnitTest.java
rename to algorithms-miscellaneous-1/src/test/java/com/baeldung/algorithms/string/SubstringPalindromeUnitTest.java
index b18a8d4a5f..8d225f67fa 100644
--- a/java-strings/src/test/java/com/baeldung/string/SubstringPalindromeUnitTest.java
+++ b/algorithms-miscellaneous-1/src/test/java/com/baeldung/algorithms/string/SubstringPalindromeUnitTest.java
@@ -1,4 +1,4 @@
-package com.baeldung.string;
+package com.baeldung.algorithms.string;
import static org.junit.Assert.assertEquals;
import java.util.HashSet;
diff --git a/apache-curator/pom.xml b/apache-curator/pom.xml
index bcca38b199..e6be32277d 100644
--- a/apache-curator/pom.xml
+++ b/apache-curator/pom.xml
@@ -59,7 +59,7 @@
4.0.13.4.11
- 2.9.4
+ 2.9.73.6.11.7.0
diff --git a/core-java-11/README.md b/core-java-11/README.md
new file mode 100644
index 0000000000..181ada3f45
--- /dev/null
+++ b/core-java-11/README.md
@@ -0,0 +1,5 @@
+### Relevant articles
+
+- [Java 11 Single File Source Code](https://www.baeldung.com/java-single-file-source-code)
+- [Java 11 Local Variable Syntax for Lambda Parameters](https://www.baeldung.com/java-var-lambda-params)
+
diff --git a/core-java-11/src/main/java/com/baeldung/add b/core-java-11/src/main/java/com/baeldung/add
new file mode 100755
index 0000000000..539c1a43d4
--- /dev/null
+++ b/core-java-11/src/main/java/com/baeldung/add
@@ -0,0 +1,12 @@
+#!/usr/local/bin/java --source 11
+
+import java.util.Arrays;
+
+public class Addition
+{
+ public static void main(String[] args) {
+ System.out.println(Arrays.stream(args)
+ .mapToInt(Integer::parseInt)
+ .sum());
+ }
+}
\ No newline at end of file
diff --git a/core-java-11/src/test/java/com/baeldung/NewStringAPIUnitTest.java b/core-java-11/src/test/java/com/baeldung/NewStringAPIUnitTest.java
new file mode 100644
index 0000000000..43e9022a64
--- /dev/null
+++ b/core-java-11/src/test/java/com/baeldung/NewStringAPIUnitTest.java
@@ -0,0 +1,43 @@
+package com.baeldung;
+
+import static org.hamcrest.CoreMatchers.is;
+
+import static org.junit.Assert.assertTrue;
+
+import org.junit.Test;
+
+public class NewStringAPIUnitTest {
+
+ @Test
+ public void whenRepeatStringTwice_thenGetStringTwice() {
+ String output = "La ".repeat(2) + "Land";
+
+ is(output).equals("La La Land");
+ }
+
+ @Test
+ public void whenStripString_thenReturnStringWithoutWhitespaces() {
+ is("\n\t hello \u2005".strip()).equals("hello");
+ }
+
+ @Test
+ public void whenTrimAdvanceString_thenReturnStringWithWhitespaces() {
+ is("\n\t hello \u2005".trim()).equals("hello \u2005");
+ }
+
+ @Test
+ public void whenBlankString_thenReturnTrue() {
+ assertTrue("\n\t\u2005 ".isBlank());
+ }
+
+ @Test
+ public void whenMultilineString_thenReturnNonEmptyLineCount() {
+ String multilineStr = "This is\n \n a multiline\n string.";
+
+ long lineCount = multilineStr.lines()
+ .filter(String::isBlank)
+ .count();
+
+ is(lineCount).equals(3L);
+ }
+}
\ No newline at end of file
diff --git a/core-java-11/src/test/java/com/baeldung/optional/OptionalUnitTest.java b/core-java-11/src/test/java/com/baeldung/optional/OptionalUnitTest.java
new file mode 100644
index 0000000000..281155138d
--- /dev/null
+++ b/core-java-11/src/test/java/com/baeldung/optional/OptionalUnitTest.java
@@ -0,0 +1,23 @@
+package com.baeldung.optional;
+
+import org.junit.Test;
+
+import java.util.Optional;
+
+import static org.junit.Assert.assertFalse;
+import static org.junit.Assert.assertTrue;
+
+/**
+ * Unit tests for {@link Optional} in Java 11.
+ */
+public class OptionalUnitTest {
+
+ @Test
+ public void givenAnEmptyOptional_isEmpty_thenBehavesAsExpected() {
+ Optional opt = Optional.of("Baeldung");
+ assertFalse(opt.isEmpty());
+
+ opt = Optional.ofNullable(null);
+ assertTrue(opt.isEmpty());
+ }
+}
diff --git a/core-java-8/README.md b/core-java-8/README.md
index 6786b29120..e5fa953cc7 100644
--- a/core-java-8/README.md
+++ b/core-java-8/README.md
@@ -15,7 +15,6 @@
- [Guide to Java 8 Comparator.comparing()](http://www.baeldung.com/java-8-comparator-comparing)
- [Guide To Java 8 Optional](http://www.baeldung.com/java-optional)
- [Guide to the Java 8 forEach](http://www.baeldung.com/foreach-java)
-- [Java Base64 Encoding and Decoding](http://www.baeldung.com/java-base64-encode-and-decode)
- [The Difference Between map() and flatMap()](http://www.baeldung.com/java-difference-map-and-flatmap)
- [Static and Default Methods in Interfaces in Java](http://www.baeldung.com/java-static-default-methods)
- [Efficient Word Frequency Calculator in Java](http://www.baeldung.com/java-word-frequency)
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/Electronic.java b/core-java-8/src/main/java/com/baeldung/interfaces/Electronic.java
new file mode 100644
index 0000000000..bfbc381483
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/Electronic.java
@@ -0,0 +1,22 @@
+package com.baeldung.interfaces;
+
+public interface Electronic {
+ //Constant variable
+ public static final String LED = "LED";
+
+ //Abstract method
+ public int getElectricityUse();
+
+ // Static method
+ public static boolean isEnergyEfficient(String electtronicType) {
+ if (electtronicType.equals(LED)) {
+ return true;
+ }
+ return false;
+ }
+
+ //Default method
+ public default void printDescription() {
+ System.out.println("Electronic Description");
+ }
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/Employee.java b/core-java-8/src/main/java/com/baeldung/interfaces/Employee.java
new file mode 100644
index 0000000000..903bc81e6f
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/Employee.java
@@ -0,0 +1,15 @@
+package com.baeldung.interfaces;
+
+public class Employee {
+
+ private double salary;
+
+ public double getSalary() {
+ return salary;
+ }
+
+ public void setSalary(double salary) {
+ this.salary = salary;
+ }
+
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/EmployeeSalaryComparator.java b/core-java-8/src/main/java/com/baeldung/interfaces/EmployeeSalaryComparator.java
new file mode 100644
index 0000000000..cfa4226c1a
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/EmployeeSalaryComparator.java
@@ -0,0 +1,18 @@
+package com.baeldung.interfaces;
+
+import java.util.Comparator;
+
+public class EmployeeSalaryComparator implements Comparator {
+
+ @Override
+ public int compare(Employee employeeA, Employee employeeB) {
+
+ if(employeeA.getSalary() < employeeB.getSalary()){
+ return -1;
+ }else if(employeeA.getSalary() > employeeB.getSalary()){
+ return 1;
+ }else{
+ return 0;
+ }
+ }
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/HasColor.java b/core-java-8/src/main/java/com/baeldung/interfaces/HasColor.java
new file mode 100644
index 0000000000..6eface2d47
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/HasColor.java
@@ -0,0 +1,5 @@
+package com.baeldung.interfaces;
+
+public interface HasColor {
+ public String getColor();
+}
\ No newline at end of file
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/Motorcycle.java b/core-java-8/src/main/java/com/baeldung/interfaces/Motorcycle.java
new file mode 100644
index 0000000000..6003f476a3
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/Motorcycle.java
@@ -0,0 +1,10 @@
+package com.baeldung.interfaces;
+
+import com.baeldung.interfaces.multiinheritance.Transform;
+
+public class Motorcycle implements Transform {
+ @Override
+ public void transform() {
+ // Implementation
+ }
+}
\ No newline at end of file
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/Truck.java b/core-java-8/src/main/java/com/baeldung/interfaces/Truck.java
new file mode 100644
index 0000000000..d78de23371
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/Truck.java
@@ -0,0 +1,8 @@
+package com.baeldung.interfaces;
+
+public class Truck extends Vehicle {
+ @Override
+ public void transform() {
+ // implementation
+ }
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/Vehicle.java b/core-java-8/src/main/java/com/baeldung/interfaces/Vehicle.java
new file mode 100644
index 0000000000..8b4662e1a3
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/Vehicle.java
@@ -0,0 +1,6 @@
+package com.baeldung.interfaces;
+
+import com.baeldung.interfaces.multiinheritance.Transform;
+
+public abstract class Vehicle implements Transform {
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Car.java b/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Car.java
new file mode 100644
index 0000000000..b951fc0273
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Car.java
@@ -0,0 +1,13 @@
+package com.baeldung.interfaces.multiinheritance;
+
+public class Car implements Fly, Transform {
+ @Override
+ public void fly() {
+ System.out.println("I can Fly!!");
+ }
+
+ @Override
+ public void transform() {
+ System.out.println("I can Transform!!");
+ }
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Fly.java b/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Fly.java
new file mode 100644
index 0000000000..d84182aec6
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Fly.java
@@ -0,0 +1,5 @@
+package com.baeldung.interfaces.multiinheritance;
+
+public abstract interface Fly{
+ void fly();
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Transform.java b/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Transform.java
new file mode 100644
index 0000000000..8bdba43a05
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Transform.java
@@ -0,0 +1,10 @@
+package com.baeldung.interfaces.multiinheritance;
+
+public interface Transform {
+
+ void transform();
+
+ default void printSpecs(){
+ System.out.println("Transform Specification");
+ }
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Vehicle.java b/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Vehicle.java
new file mode 100644
index 0000000000..fb0d36e3e0
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/multiinheritance/Vehicle.java
@@ -0,0 +1,13 @@
+package com.baeldung.interfaces.multiinheritance;
+
+public class Vehicle implements Fly, Transform {
+ @Override
+ public void fly() {
+ System.out.println("I can Fly!!");
+ }
+
+ @Override
+ public void transform() {
+ System.out.println("I can Transform!!");
+ }
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/Circle.java b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/Circle.java
new file mode 100644
index 0000000000..afb3142d96
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/Circle.java
@@ -0,0 +1,25 @@
+package com.baeldung.interfaces.polymorphysim;
+
+public class Circle implements Shape {
+
+ private double radius;
+
+ public Circle(double radius){
+ this.radius = radius;
+ }
+
+ @Override
+ public String name() {
+ return "Circle";
+ }
+
+ @Override
+ public double area() {
+ return Math.PI * (radius * radius);
+ }
+
+ @Override
+ public String getColor() {
+ return "green";
+ }
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/DisplayShape.java b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/DisplayShape.java
new file mode 100644
index 0000000000..d9c9dd107a
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/DisplayShape.java
@@ -0,0 +1,26 @@
+package com.baeldung.interfaces.polymorphysim;
+
+import java.util.ArrayList;
+
+public class DisplayShape {
+
+ private ArrayList shapes;
+
+ public ArrayList getShapes() {
+ return shapes;
+ }
+
+ public DisplayShape() {
+ shapes = new ArrayList<>();
+ }
+
+ public void add(Shape shape) {
+ shapes.add(shape);
+ }
+
+ public void display() {
+ for (Shape shape : shapes) {
+ System.out.println(shape.name() + " area: " + shape.area());
+ }
+ }
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/FunctionalMain.java b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/FunctionalMain.java
new file mode 100644
index 0000000000..5316dd7db7
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/FunctionalMain.java
@@ -0,0 +1,23 @@
+package com.baeldung.interfaces.polymorphysim;
+
+import java.util.function.Predicate;
+
+public class FunctionalMain {
+
+public static void main(String[] args) {
+ Shape circleShape = new Circle(2);
+ Shape squareShape = new Square(2);
+
+ DisplayShape DisplayShape = new DisplayShape();
+ DisplayShape.add(circleShape);
+ DisplayShape.add(squareShape);
+
+ Predicate checkArea = (shape) -> shape.area() < 5;
+
+ for (Shape shape : DisplayShape.getShapes()) {
+ if (checkArea.test(shape)) {
+ System.out.println(shape.name() + " " + shape.area());
+ }
+ }
+}
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/MainPolymorphic.java b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/MainPolymorphic.java
new file mode 100644
index 0000000000..cc43c1300b
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/MainPolymorphic.java
@@ -0,0 +1,15 @@
+package com.baeldung.interfaces.polymorphysim;
+
+public class MainPolymorphic {
+ public static void main(String[] args){
+
+ Shape circleShape = new Circle(2);
+ Shape squareShape = new Square(2);
+
+ DisplayShape displayShape = new DisplayShape();
+ displayShape.add(circleShape);
+ displayShape.add(squareShape);
+
+ displayShape.display();
+ }
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/Shape.java b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/Shape.java
new file mode 100644
index 0000000000..560e07a80a
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/Shape.java
@@ -0,0 +1,9 @@
+package com.baeldung.interfaces.polymorphysim;
+
+import com.baeldung.interfaces.HasColor;
+
+public interface Shape extends HasColor {
+
+ public abstract String name();
+ public abstract double area();
+}
diff --git a/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/Square.java b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/Square.java
new file mode 100644
index 0000000000..00b75ace20
--- /dev/null
+++ b/core-java-8/src/main/java/com/baeldung/interfaces/polymorphysim/Square.java
@@ -0,0 +1,25 @@
+package com.baeldung.interfaces.polymorphysim;
+
+public class Square implements Shape {
+
+ private double width;
+
+ public Square(double width) {
+ this.width = width;
+ }
+
+ @Override
+ public String name() {
+ return "Square";
+ }
+
+ @Override
+ public double area() {
+ return width * width;
+ }
+
+ @Override
+ public String getColor() {
+ return "red";
+ }
+}
diff --git a/core-java-8/src/test/java/com/baeldung/interfaces/PolymorphysimUnitTest.java b/core-java-8/src/test/java/com/baeldung/interfaces/PolymorphysimUnitTest.java
new file mode 100644
index 0000000000..7ded5e6621
--- /dev/null
+++ b/core-java-8/src/test/java/com/baeldung/interfaces/PolymorphysimUnitTest.java
@@ -0,0 +1,26 @@
+package com.baeldung.interfaces;
+
+import com.baeldung.interfaces.polymorphysim.Circle;
+import com.baeldung.interfaces.polymorphysim.Shape;
+import com.baeldung.interfaces.polymorphysim.Square;
+import org.assertj.core.api.Assertions;
+import org.junit.Test;
+
+public class PolymorphysimUnitTest {
+
+ @Test
+ public void whenInterfacePointsToCircle_CircleAreaMethodisBeingCalled(){
+ double expectedArea = 12.566370614359172;
+ Shape circle = new Circle(2);
+ double actualArea = circle.area();
+ Assertions.assertThat(actualArea).isEqualTo(expectedArea);
+ }
+
+ @Test
+ public void whenInterfacePointsToSquare_SquareAreaMethodisBeingCalled(){
+ double expectedArea = 4;
+ Shape square = new Square(2);
+ double actualArea = square.area();
+ Assertions.assertThat(actualArea).isEqualTo(expectedArea);
+ }
+}
diff --git a/core-java-9/README.md b/core-java-9/README.md
index 38816471aa..c96267dc95 100644
--- a/core-java-9/README.md
+++ b/core-java-9/README.md
@@ -9,7 +9,6 @@
- [Java 9 Convenience Factory Methods for Collections](http://www.baeldung.com/java-9-collections-factory-methods)
- [New Stream Collectors in Java 9](http://www.baeldung.com/java9-stream-collectors)
- [Java 9 CompletableFuture API Improvements](http://www.baeldung.com/java-9-completablefuture)
-- [Spring Security – Redirect to the Previous URL After Login](http://www.baeldung.com/spring-security-redirect-login)
- [Java 9 Process API Improvements](http://www.baeldung.com/java-9-process-api)
- [Introduction to Java 9 StackWalking API](http://www.baeldung.com/java-9-stackwalking-api)
- [Introduction to Project Jigsaw](http://www.baeldung.com/project-jigsaw-java-modularity)
diff --git a/core-java-arrays/src/main/java/com/baeldung/arraycopy/model/Employee.java b/core-java-arrays/src/main/java/com/baeldung/arraycopy/model/Employee.java
index 757a8f8ec1..a7592574d9 100644
--- a/core-java-arrays/src/main/java/com/baeldung/arraycopy/model/Employee.java
+++ b/core-java-arrays/src/main/java/com/baeldung/arraycopy/model/Employee.java
@@ -7,6 +7,14 @@ public class Employee implements Serializable {
private int id;
private String name;
+ public Employee() {
+ }
+
+ public Employee(int id, String name) {
+ this.id = id;
+ this.name = name;
+ }
+
public int getId() {
return id;
}
diff --git a/core-java-arrays/src/test/java/com/baeldung/sort/ArraySortUnitTest.java b/core-java-arrays/src/test/java/com/baeldung/sort/ArraySortUnitTest.java
new file mode 100644
index 0000000000..59035738fe
--- /dev/null
+++ b/core-java-arrays/src/test/java/com/baeldung/sort/ArraySortUnitTest.java
@@ -0,0 +1,90 @@
+package com.baeldung.sort;
+
+import com.baeldung.arraycopy.model.Employee;
+import org.junit.Before;
+import org.junit.Test;
+
+import java.util.Arrays;
+import java.util.Comparator;
+import java.util.stream.IntStream;
+
+import static org.junit.Assert.assertArrayEquals;
+
+public class ArraySortUnitTest {
+ private Employee[] employees;
+ private int[] numbers;
+ private String[] strings;
+
+ private Employee john = new Employee(6, "John");
+ private Employee mary = new Employee(3, "Mary");
+ private Employee david = new Employee(4, "David");
+
+ @Before
+ public void setup() {
+ createEmployeesArray();
+ createNumbersArray();
+ createStringArray();
+ }
+
+ private void createEmployeesArray() {
+ employees = new Employee[]{john, mary, david};
+ }
+
+ private void createNumbersArray() {
+ numbers = new int[]{-8, 7, 5, 9, 10, -2, 3};
+ }
+
+ private void createStringArray() {
+ strings = new String[]{"learning", "java", "with", "baeldung"};
+ }
+
+ @Test
+ public void givenIntArray_whenSortingAscending_thenCorrectlySorted() {
+ Arrays.sort(numbers);
+
+ assertArrayEquals(new int[]{-8, -2, 3, 5, 7, 9, 10}, numbers);
+ }
+
+ @Test
+ public void givenIntArray_whenSortingDescending_thenCorrectlySorted() {
+ numbers = IntStream.of(numbers).boxed().sorted(Comparator.reverseOrder()).mapToInt(i -> i).toArray();
+
+ assertArrayEquals(new int[]{10, 9, 7, 5, 3, -2, -8}, numbers);
+ }
+
+ @Test
+ public void givenStringArray_whenSortingAscending_thenCorrectlySorted() {
+ Arrays.sort(strings);
+
+ assertArrayEquals(new String[]{"baeldung", "java", "learning", "with"}, strings);
+ }
+
+ @Test
+ public void givenStringArray_whenSortingDescending_thenCorrectlySorted() {
+ Arrays.sort(strings, Comparator.reverseOrder());
+
+ assertArrayEquals(new String[]{"with", "learning", "java", "baeldung"}, strings);
+ }
+
+ @Test
+ public void givenObjectArray_whenSortingAscending_thenCorrectlySorted() {
+ Arrays.sort(employees, Comparator.comparing(Employee::getName));
+
+ assertArrayEquals(new Employee[]{david, john, mary}, employees);
+ }
+
+ @Test
+ public void givenObjectArray_whenSortingDescending_thenCorrectlySorted() {
+ Arrays.sort(employees, Comparator.comparing(Employee::getName).reversed());
+
+ assertArrayEquals(new Employee[]{mary, john, david}, employees);
+ }
+
+ @Test
+ public void givenObjectArray_whenSortingMultipleAttributesAscending_thenCorrectlySorted() {
+ Arrays.sort(employees, Comparator.comparing(Employee::getName).thenComparing(Employee::getId));
+
+ assertArrayEquals(new Employee[]{david, john, mary}, employees);
+ }
+
+}
diff --git a/core-java-collections-list/README.md b/core-java-collections-list/README.md
new file mode 100644
index 0000000000..cb6999277c
--- /dev/null
+++ b/core-java-collections-list/README.md
@@ -0,0 +1,28 @@
+=========
+
+## Core Java Collections List Cookbooks and Examples
+
+### Relevant Articles:
+- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
+- [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
+- [Random List Element](http://www.baeldung.com/java-random-list-element)
+- [Removing all nulls from a List in Java](http://www.baeldung.com/java-remove-nulls-from-list)
+- [Removing all duplicates from a List in Java](http://www.baeldung.com/java-remove-duplicates-from-list)
+- [How to TDD a List Implementation in Java](http://www.baeldung.com/java-test-driven-list)
+- [Iterating Backward Through a List](http://www.baeldung.com/java-list-iterate-backwards)
+- [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
+- [Remove the First Element from a List](http://www.baeldung.com/java-remove-first-element-from-list)
+- [How to Find an Element in a List with Java](http://www.baeldung.com/find-list-element-java)
+- [Copy a List to Another List in Java](http://www.baeldung.com/java-copy-list-to-another)
+- [Finding Max/Min of a List or Collection](http://www.baeldung.com/java-collection-min-max)
+- [Collections.emptyList() vs. New List Instance](https://www.baeldung.com/java-collections-emptylist-new-list)
+- [Remove All Occurrences of a Specific Value from a List](https://www.baeldung.com/java-remove-value-from-list)
+- [Converting a Collection to ArrayList in Java](https://www.baeldung.com/java-convert-collection-arraylist)
+- [Check If Two Lists are Equal in Java](http://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
+- [Java 8 Streams: Find Items From One List Based On Values From Another List](https://www.baeldung.com/java-streams-find-list-items)
+- [A Guide to the Java LinkedList](http://www.baeldung.com/java-linkedlist)
+- [Java List UnsupportedOperationException](http://www.baeldung.com/java-list-unsupported-operation-exception)
+- [Java List Initialization in One Line](https://www.baeldung.com/java-init-list-one-line)
+- [Ways to Iterate Over a List in Java](https://www.baeldung.com/java-iterate-list)
+- [ClassCastException: Arrays$ArrayList cannot be cast to ArrayList](https://www.baeldung.com/java-classcastexception-arrays-arraylist)
+- [Flattening Nested Collections in Java](http://www.baeldung.com/java-flatten-nested-collections)
\ No newline at end of file
diff --git a/core-java-collections-list/pom.xml b/core-java-collections-list/pom.xml
new file mode 100644
index 0000000000..ee99e470d0
--- /dev/null
+++ b/core-java-collections-list/pom.xml
@@ -0,0 +1,48 @@
+
+ 4.0.0
+ core-java-collections-list
+ 0.1.0-SNAPSHOT
+ jar
+ core-java-collections-list
+
+
+ com.baeldung
+ parent-java
+ 0.0.1-SNAPSHOT
+ ../parent-java
+
+
+
+
+ org.apache.commons
+ commons-collections4
+ ${commons-collections4.version}
+
+
+ org.apache.commons
+ commons-lang3
+ ${commons-lang3.version}
+
+
+ org.assertj
+ assertj-core
+ ${assertj.version}
+ test
+
+
+ org.projectlombok
+ lombok
+ ${lombok.version}
+ provided
+
+
+
+
+ 4.1
+ 3.8.1
+ 1.7.0
+ 3.11.1
+ 1.16.12
+
+
diff --git a/core-java-collections/src/main/java/com/baeldung/classcastexception/ClassCastException.java b/core-java-collections-list/src/main/java/com/baeldung/classcastexception/ClassCastException.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/classcastexception/ClassCastException.java
rename to core-java-collections-list/src/main/java/com/baeldung/classcastexception/ClassCastException.java
diff --git a/core-java-collections/src/main/java/com/baeldung/findanelement/Customer.java b/core-java-collections-list/src/main/java/com/baeldung/findanelement/Customer.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/findanelement/Customer.java
rename to core-java-collections-list/src/main/java/com/baeldung/findanelement/Customer.java
diff --git a/core-java-collections/src/main/java/com/baeldung/findanelement/FindACustomerInGivenList.java b/core-java-collections-list/src/main/java/com/baeldung/findanelement/FindACustomerInGivenList.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/findanelement/FindACustomerInGivenList.java
rename to core-java-collections-list/src/main/java/com/baeldung/findanelement/FindACustomerInGivenList.java
diff --git a/core-java-collections/src/main/java/com/baeldung/java/list/CopyListService.java b/core-java-collections-list/src/main/java/com/baeldung/java/list/CopyListService.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/java/list/CopyListService.java
rename to core-java-collections-list/src/main/java/com/baeldung/java/list/CopyListService.java
diff --git a/core-java-collections/src/main/java/com/baeldung/java/list/CustomList.java b/core-java-collections-list/src/main/java/com/baeldung/java/list/CustomList.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/java/list/CustomList.java
rename to core-java-collections-list/src/main/java/com/baeldung/java/list/CustomList.java
diff --git a/core-java-collections/src/main/java/com/baeldung/java/list/Flower.java b/core-java-collections-list/src/main/java/com/baeldung/java/list/Flower.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/java/list/Flower.java
rename to core-java-collections-list/src/main/java/com/baeldung/java/list/Flower.java
diff --git a/core-java-collections/src/main/java/com/baeldung/java/list/ReverseIterator.java b/core-java-collections-list/src/main/java/com/baeldung/java/list/ReverseIterator.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/java/list/ReverseIterator.java
rename to core-java-collections-list/src/main/java/com/baeldung/java/list/ReverseIterator.java
diff --git a/core-java-collections/src/main/java/com/baeldung/java/list/WaysToIterate.java b/core-java-collections-list/src/main/java/com/baeldung/java/list/WaysToIterate.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/java/list/WaysToIterate.java
rename to core-java-collections-list/src/main/java/com/baeldung/java/list/WaysToIterate.java
diff --git a/core-java-collections/src/main/java/com/baeldung/java_8_features/Car.java b/core-java-collections-list/src/main/java/com/baeldung/java_8_features/Car.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/java_8_features/Car.java
rename to core-java-collections-list/src/main/java/com/baeldung/java_8_features/Car.java
diff --git a/core-java-collections/src/main/java/com/baeldung/java_8_features/Person.java b/core-java-collections-list/src/main/java/com/baeldung/java_8_features/Person.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/java_8_features/Person.java
rename to core-java-collections-list/src/main/java/com/baeldung/java_8_features/Person.java
diff --git a/core-java-collections/src/main/java/com/baeldung/list/listoflist/Pen.java b/core-java-collections-list/src/main/java/com/baeldung/list/listoflist/Pen.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/list/listoflist/Pen.java
rename to core-java-collections-list/src/main/java/com/baeldung/list/listoflist/Pen.java
diff --git a/core-java-collections/src/main/java/com/baeldung/list/listoflist/Pencil.java b/core-java-collections-list/src/main/java/com/baeldung/list/listoflist/Pencil.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/list/listoflist/Pencil.java
rename to core-java-collections-list/src/main/java/com/baeldung/list/listoflist/Pencil.java
diff --git a/core-java-collections/src/main/java/com/baeldung/list/listoflist/Rubber.java b/core-java-collections-list/src/main/java/com/baeldung/list/listoflist/Rubber.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/list/listoflist/Rubber.java
rename to core-java-collections-list/src/main/java/com/baeldung/list/listoflist/Rubber.java
diff --git a/core-java-collections/src/main/java/com/baeldung/list/listoflist/Stationery.java b/core-java-collections-list/src/main/java/com/baeldung/list/listoflist/Stationery.java
similarity index 100%
rename from core-java-collections/src/main/java/com/baeldung/list/listoflist/Stationery.java
rename to core-java-collections-list/src/main/java/com/baeldung/list/listoflist/Stationery.java
diff --git a/core-java-collections-list/src/main/java/com/baeldung/list/multidimensional/ArrayListOfArrayList.java b/core-java-collections-list/src/main/java/com/baeldung/list/multidimensional/ArrayListOfArrayList.java
new file mode 100644
index 0000000000..72045d6761
--- /dev/null
+++ b/core-java-collections-list/src/main/java/com/baeldung/list/multidimensional/ArrayListOfArrayList.java
@@ -0,0 +1,37 @@
+package com.baeldung.list.multidimensional;
+
+import java.util.ArrayList;
+
+public class ArrayListOfArrayList {
+
+ public static void main(String args[]) {
+
+ int vertex = 5;
+ ArrayList> graph = new ArrayList<>(vertex);
+
+ //Initializing each element of ArrayList with ArrayList
+ for(int i=0; i< vertex; i++) {
+ graph.add(new ArrayList());
+ }
+
+ //We can add any number of columns to each row
+ graph.get(0).add(1);
+ graph.get(0).add(5);
+ graph.get(1).add(0);
+ graph.get(1).add(2);
+ graph.get(2).add(1);
+ graph.get(2).add(3);
+ graph.get(3).add(2);
+ graph.get(3).add(4);
+ graph.get(4).add(3);
+ graph.get(4).add(5);
+
+ //Printing all the edges
+ for(int i=0; i > > space = new ArrayList<>(x_axis_length);
+
+ //Initializing each element of ArrayList with ArrayList< ArrayList >
+ for(int i=0; i< x_axis_length; i++) {
+ space.add(new ArrayList< ArrayList >(y_axis_length));
+ for(int j =0; j< y_axis_length; j++) {
+ space.get(i).add(new ArrayList(z_axis_length));
+ }
+ }
+
+ //Set Red color for points (0,0,0) and (0,0,1)
+ space.get(0).get(0).add("Red");
+ space.get(0).get(0).add("Red");
+ //Set Blue color for points (0,1,0) and (0,1,1)
+ space.get(0).get(1).add("Blue");
+ space.get(0).get(1).add("Blue");
+ //Set Green color for points (1,0,0) and (1,0,1)
+ space.get(1).get(0).add("Green");
+ space.get(1).get(0).add("Green");
+ //Set Yellow color for points (1,1,0) and (1,1,1)
+ space.get(1).get(1).add("Yellow");
+ space.get(1).get(1).add("Yellow");
+
+ //Printing colors for all the points
+ for(int i=0; i list1 = Arrays.asList("1", "2", "3", "4");
+ private final List list2 = Arrays.asList("1", "2", "3", "4");
+ private final List list3 = Arrays.asList("1", "2", "4", "3");
+
+ @Test
+ public void whenTestingForEquality_ShouldBeEqual() throws Exception {
+ Assert.assertEquals(list1, list2);
+ Assert.assertNotSame(list1, list2);
+ Assert.assertNotEquals(list1, list3);
+ }
+
+ @Test
+ public void whenIntersection_ShouldReturnCommonElements() throws Exception {
+ List list = Arrays.asList("red", "blue", "blue", "green", "red");
+ List otherList = Arrays.asList("red", "green", "green", "yellow");
+
+ Set commonElements = new HashSet(Arrays.asList("red", "green"));
+
+ Set result = list.stream()
+ .distinct()
+ .filter(otherList::contains)
+ .collect(Collectors.toSet());
+
+ Assert.assertEquals(commonElements, result);
+
+ Set inverseResult = otherList.stream()
+ .distinct()
+ .filter(list::contains)
+ .collect(Collectors.toSet());
+
+ Assert.assertEquals(commonElements, inverseResult);
+ }
+}
diff --git a/core-java-collections/src/test/java/org/baeldung/java/lists/ListTestNgUnitTest.java b/core-java-collections-list/src/test/java/org/baeldung/java/lists/ListTestNgUnitTest.java
similarity index 100%
rename from core-java-collections/src/test/java/org/baeldung/java/lists/ListTestNgUnitTest.java
rename to core-java-collections-list/src/test/java/org/baeldung/java/lists/ListTestNgUnitTest.java
diff --git a/core-java-collections/src/test/java/org/baeldung/java/lists/README.md b/core-java-collections-list/src/test/java/org/baeldung/java/lists/README.md
similarity index 100%
rename from core-java-collections/src/test/java/org/baeldung/java/lists/README.md
rename to core-java-collections-list/src/test/java/org/baeldung/java/lists/README.md
diff --git a/core-java-collections/README.md b/core-java-collections/README.md
index 4c0b24cd5d..15be81156c 100644
--- a/core-java-collections/README.md
+++ b/core-java-collections/README.md
@@ -3,36 +3,21 @@
## Core Java Collections Cookbooks and Examples
### Relevant Articles:
-- [Immutable ArrayList in Java](http://www.baeldung.com/java-immutable-list)
-- [Guide to the Java ArrayList](http://www.baeldung.com/java-arraylist)
-- [Random List Element](http://www.baeldung.com/java-random-list-element)
- [Java - Combine Multiple Collections](http://www.baeldung.com/java-combine-multiple-collections)
-- [Removing all nulls from a List in Java](http://www.baeldung.com/java-remove-nulls-from-list)
-- [Removing all duplicates from a List in Java](http://www.baeldung.com/java-remove-duplicates-from-list)
-- [Flattening Nested Collections in Java](http://www.baeldung.com/java-flatten-nested-collections)
- [HashSet and TreeSet Comparison](http://www.baeldung.com/java-hashset-vs-treeset)
- [Collect a Java Stream to an Immutable Collection](http://www.baeldung.com/java-stream-immutable-collection)
- [Introduction to the Java ArrayDeque](http://www.baeldung.com/java-array-deque)
- [A Guide to HashSet in Java](http://www.baeldung.com/java-hashset)
- [A Guide to TreeSet in Java](http://www.baeldung.com/java-tree-set)
-- [How to TDD a List Implementation in Java](http://www.baeldung.com/java-test-driven-list)
- [Getting the Size of an Iterable in Java](http://www.baeldung.com/java-iterable-size)
-- [Iterating Backward Through a List](http://www.baeldung.com/java-list-iterate-backwards)
- [How to Filter a Collection in Java](http://www.baeldung.com/java-collection-filtering)
-- [Add Multiple Items to an Java ArrayList](http://www.baeldung.com/java-add-items-array-list)
-- [Remove the First Element from a List](http://www.baeldung.com/java-remove-first-element-from-list)
- [Initializing HashSet at the Time of Construction](http://www.baeldung.com/java-initialize-hashset)
- [Removing the First Element of an Array](https://www.baeldung.com/java-array-remove-first-element)
- [Fail-Safe Iterator vs Fail-Fast Iterator](http://www.baeldung.com/java-fail-safe-vs-fail-fast-iterator)
- [Shuffling Collections In Java](http://www.baeldung.com/java-shuffle-collection)
-- [How to Find an Element in a List with Java](http://www.baeldung.com/find-list-element-java)
- [An Introduction to Java.util.Hashtable Class](http://www.baeldung.com/java-hash-table)
-- [Copy a List to Another List in Java](http://www.baeldung.com/java-copy-list-to-another)
-- [Finding Max/Min of a List or Collection](http://www.baeldung.com/java-collection-min-max)
- [Java Null-Safe Streams from Collections](https://www.baeldung.com/java-null-safe-streams-from-collections)
-- [Remove All Occurrences of a Specific Value from a List](https://www.baeldung.com/java-remove-value-from-list)
- [Thread Safe LIFO Data Structure Implementations](https://www.baeldung.com/java-lifo-thread-safe)
-- [Collections.emptyList() vs. New List Instance](https://www.baeldung.com/java-collections-emptylist-new-list)
- [Differences Between Collection.clear() and Collection.removeAll()](https://www.baeldung.com/java-collection-clear-vs-removeall)
- [Performance of contains() in a HashSet vs ArrayList](https://www.baeldung.com/java-hashset-arraylist-contains-performance)
- [Time Complexity of Java Collections](https://www.baeldung.com/java-collections-complexity)
@@ -40,15 +25,7 @@
- [An Introduction to Synchronized Java Collections](https://www.baeldung.com/java-synchronized-collections)
- [Guide to EnumSet](https://www.baeldung.com/java-enumset)
- [Removing Elements from Java Collections](https://www.baeldung.com/java-collection-remove-elements)
-- [Converting a Collection to ArrayList in Java](https://www.baeldung.com/java-convert-collection-arraylist)
-- [Java 8 Streams: Find Items From One List Based On Values From Another List](https://www.baeldung.com/java-streams-find-list-items)
- [Combining Different Types of Collections in Java](https://www.baeldung.com/java-combine-collections)
- [Sorting in Java](http://www.baeldung.com/java-sorting)
-- [A Guide to the Java LinkedList](http://www.baeldung.com/java-linkedlist)
-- [Java List UnsupportedOperationException](http://www.baeldung.com/java-list-unsupported-operation-exception)
- [Join and Split Arrays and Collections in Java](http://www.baeldung.com/java-join-and-split)
-- [Check If Two Lists are Equal in Java](http://www.baeldung.com/java-test-a-list-for-ordinality-and-equality)
-- [Java List Initialization in One Line](https://www.baeldung.com/java-init-list-one-line)
-- [ClassCastException: Arrays$ArrayList cannot be cast to ArrayList](https://www.baeldung.com/java-classcastexception-arrays-arraylist)
-- [A Guide to EnumMap](https://www.baeldung.com/java-enum-map)
-- [Ways to Iterate Over a List in Java](https://www.baeldung.com/java-iterate-list)
+- [A Guide to EnumMap](https://www.baeldung.com/java-enum-map)
\ No newline at end of file
diff --git a/core-java-collections/src/test/java/com/baeldung/hashmapvshashtable/HashmapVsHashtableDifferenceUnitTest.java b/core-java-collections/src/test/java/com/baeldung/hashmapvshashtable/HashmapVsHashtableDifferenceUnitTest.java
new file mode 100644
index 0000000000..5218332d60
--- /dev/null
+++ b/core-java-collections/src/test/java/com/baeldung/hashmapvshashtable/HashmapVsHashtableDifferenceUnitTest.java
@@ -0,0 +1,98 @@
+package com.baeldung.hashmapvshashtable;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.Collections;
+import java.util.ConcurrentModificationException;
+import java.util.Enumeration;
+import java.util.HashMap;
+import java.util.Hashtable;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Map;
+import java.util.Map.Entry;
+import java.util.Set;
+
+import org.junit.Test;
+
+import com.google.common.collect.Lists;
+
+public class HashmapVsHashtableDifferenceUnitTest {
+
+ // null values
+ @Test(expected = NullPointerException.class)
+ public void givenHashtable_whenAddNullKey_thenNullPointerExceptionThrown() {
+ Hashtable table = new Hashtable();
+ table.put(null, "value");
+ }
+
+ @Test(expected = NullPointerException.class)
+ public void givenHashtable_whenAddNullValue_thenNullPointerExceptionThrown() {
+ Hashtable table = new Hashtable();
+ table.put("key", null);
+ }
+
+ @Test
+ public void givenHashmap_whenAddNullKeyAndValue_thenObjectAdded() {
+ HashMap map = new HashMap();
+ map.put(null, "value");
+ map.put("key1", null);
+ map.put("key2", null);
+
+ assertEquals(3, map.size());
+ }
+
+ // fail-fast iterator
+ @Test(expected = ConcurrentModificationException.class)
+ public void givenHashmap_whenModifyUnderlyingCollection_thenConcurrentModificationExceptionThrown() {
+ HashMap map = new HashMap();
+ map.put("key1", "value1");
+ map.put("key2", "value2");
+ map.put("key3", "value3");
+
+ Iterator iterator = map.keySet().iterator();
+ while(iterator.hasNext()){
+ iterator.next();
+ map.put("key4", "value4");
+ }
+ }
+
+ @Test
+ public void givenHashtable_whenModifyUnderlyingCollection_thenItHasNoEffectOnIteratedCollection() {
+ Hashtable table = new Hashtable();
+ table.put("key1", "value1");
+ table.put("key2", "value2");
+
+ List keysSelected = Lists.newArrayList();
+ Enumeration keys = table.keys();
+ while (keys.hasMoreElements()) {
+ String key = keys.nextElement();
+ keysSelected.add(key);
+
+ if (key.equals("key1")) {
+ table.put("key3", "value3");
+ }
+ }
+
+ assertEquals(2, keysSelected.size());
+ }
+
+ // synchronized map
+ @Test
+ public void givenHashmap_thenCreateSynchronizedMap() {
+ HashMap map = new HashMap();
+ map.put("key1", "value1");
+ map.put("key2", "value2");
+ map.put("key3", "value3");
+
+ Set> set = map.entrySet();
+ synchronized (map) {
+ Iterator> it = set.iterator();
+ while(it.hasNext()) {
+ Map.Entry elem = (Map.Entry)it.next();
+ }
+ }
+
+ Map syncMap = Collections.synchronizedMap(map);
+ }
+}
diff --git a/core-java-collections/src/test/java/org/baeldung/java/lists/ListJUnitTest.java b/core-java-collections/src/test/java/org/baeldung/java/lists/ListJUnitTest.java
deleted file mode 100644
index 7dddf6c2ce..0000000000
--- a/core-java-collections/src/test/java/org/baeldung/java/lists/ListJUnitTest.java
+++ /dev/null
@@ -1,21 +0,0 @@
-package org.baeldung.java.lists;
-
-import org.junit.Assert;
-import org.junit.Test;
-
-import java.util.Arrays;
-import java.util.List;
-
-public class ListJUnitTest {
-
- private final List list1 = Arrays.asList("1", "2", "3", "4");
- private final List list2 = Arrays.asList("1", "2", "3", "4");
- private final List list3 = Arrays.asList("1", "2", "4", "3");
-
- @Test
- public void whenTestingForEquality_ShouldBeEqual() throws Exception {
- Assert.assertEquals(list1, list2);
- Assert.assertNotSame(list1, list2);
- Assert.assertNotEquals(list1, list3);
- }
-}
diff --git a/core-java-concurrency/.gitignore b/core-java-concurrency-advanced/.gitignore
similarity index 100%
rename from core-java-concurrency/.gitignore
rename to core-java-concurrency-advanced/.gitignore
diff --git a/core-java-concurrency/README.md b/core-java-concurrency-advanced/README.md
similarity index 54%
rename from core-java-concurrency/README.md
rename to core-java-concurrency-advanced/README.md
index 682c9b8ef0..bcbec9d687 100644
--- a/core-java-concurrency/README.md
+++ b/core-java-concurrency-advanced/README.md
@@ -1,34 +1,24 @@
=========
-## Core Java Concurrency Examples
+## Core Java Concurrency Advanced Examples
### Relevant Articles:
-- [Guide To CompletableFuture](http://www.baeldung.com/java-completablefuture)
-- [A Guide to the Java ExecutorService](http://www.baeldung.com/java-executor-service-tutorial)
- [Introduction to Thread Pools in Java](http://www.baeldung.com/thread-pool-java-and-guava)
-- [Guide to java.util.concurrent.Future](http://www.baeldung.com/java-future)
- [Guide to CountDownLatch in Java](http://www.baeldung.com/java-countdown-latch)
- [Guide to java.util.concurrent.Locks](http://www.baeldung.com/java-concurrent-locks)
- [An Introduction to ThreadLocal in Java](http://www.baeldung.com/java-threadlocal)
-- [Difference Between Wait and Sleep in Java](http://www.baeldung.com/java-wait-and-sleep)
- [LongAdder and LongAccumulator in Java](http://www.baeldung.com/java-longadder-and-longaccumulator)
- [The Dining Philosophers Problem in Java](http://www.baeldung.com/java-dining-philoshophers)
- [Guide to the Java Phaser](http://www.baeldung.com/java-phaser)
-- [Guide to Synchronized Keyword in Java](http://www.baeldung.com/java-synchronized)
- [An Introduction to Atomic Variables in Java](http://www.baeldung.com/java-atomic-variables)
- [CyclicBarrier in Java](http://www.baeldung.com/java-cyclic-barrier)
- [Guide to Volatile Keyword in Java](http://www.baeldung.com/java-volatile)
-- [Overview of the java.util.concurrent](http://www.baeldung.com/java-util-concurrent)
- [Semaphores in Java](http://www.baeldung.com/java-semaphore)
- [Daemon Threads in Java](http://www.baeldung.com/java-daemon-thread)
-- [Implementing a Runnable vs Extending a Thread](http://www.baeldung.com/java-runnable-vs-extending-thread)
-- [How to Kill a Java Thread](http://www.baeldung.com/java-thread-stop)
-- [ExecutorService - Waiting for Threads to Finish](http://www.baeldung.com/java-executor-wait-for-threads)
-- [wait and notify() Methods in Java](http://www.baeldung.com/java-wait-notify)
- [Priority-based Job Scheduling in Java](http://www.baeldung.com/java-priority-job-schedule)
-- [A Custom Spring SecurityConfigurer](http://www.baeldung.com/spring-security-custom-configurer)
-- [Life Cycle of a Thread in Java](http://www.baeldung.com/java-thread-lifecycle)
-- [Runnable vs. Callable in Java](http://www.baeldung.com/java-runnable-callable)
- [Brief Introduction to Java Thread.yield()](https://www.baeldung.com/java-thread-yield)
- [Print Even and Odd Numbers Using 2 Threads](https://www.baeldung.com/java-even-odd-numbers-with-2-threads)
- [Java CyclicBarrier vs CountDownLatch](https://www.baeldung.com/java-cyclicbarrier-countdownlatch)
+- [Guide to the Fork/Join Framework in Java](http://www.baeldung.com/java-fork-join)
+- [A Guide to ThreadLocalRandom in Java](http://www.baeldung.com/java-thread-local-random)
+- [The Thread.join() Method in Java](http://www.baeldung.com/java-thread-join)
\ No newline at end of file
diff --git a/core-java-concurrency/pom.xml b/core-java-concurrency-advanced/pom.xml
similarity index 78%
rename from core-java-concurrency/pom.xml
rename to core-java-concurrency-advanced/pom.xml
index bd22253c2c..1209cba619 100644
--- a/core-java-concurrency/pom.xml
+++ b/core-java-concurrency-advanced/pom.xml
@@ -2,10 +2,10 @@
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0com.baeldung
- core-java-concurrency
+ core-java-concurrency-advanced0.1.0-SNAPSHOTjar
- core-java-concurrency
+ core-java-concurrency-advancedcom.baeldung
@@ -47,10 +47,20 @@
${avaitility.version}test
+
+ org.openjdk.jmh
+ jmh-core
+ ${jmh-core.version}
+
+
+ org.openjdk.jmh
+ jmh-generator-annprocess
+ ${jmh-generator-annprocess.version}
+
- core-java-concurrency
+ core-java-concurrency-advancedsrc/main/resources
@@ -69,6 +79,8 @@
3.6.11.7.0
+ 1.19
+ 1.19
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithLock.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithLock.java
similarity index 94%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithLock.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithLock.java
index e3a1629ce1..ef6b7ee8c8 100644
--- a/core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithLock.java
+++ b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithLock.java
@@ -1,13 +1,13 @@
-package com.baeldung.concurrent.atomic;
-
-public class SafeCounterWithLock {
- private volatile int counter;
-
- int getValue() {
- return counter;
- }
-
- synchronized void increment() {
- counter++;
- }
-}
+package com.baeldung.concurrent.atomic;
+
+public class SafeCounterWithLock {
+ private volatile int counter;
+
+ int getValue() {
+ return counter;
+ }
+
+ synchronized void increment() {
+ counter++;
+ }
+}
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithoutLock.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithoutLock.java
similarity index 96%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithoutLock.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithoutLock.java
index 18ade35efb..8b2aebba7c 100644
--- a/core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithoutLock.java
+++ b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/atomic/SafeCounterWithoutLock.java
@@ -1,21 +1,21 @@
-package com.baeldung.concurrent.atomic;
-
-import java.util.concurrent.atomic.AtomicInteger;
-
-public class SafeCounterWithoutLock {
- private final AtomicInteger counter = new AtomicInteger(0);
-
- int getValue() {
- return counter.get();
- }
-
- void increment() {
- while(true) {
- int existingValue = getValue();
- int newValue = existingValue + 1;
- if(counter.compareAndSet(existingValue, newValue)) {
- return;
- }
- }
- }
-}
+package com.baeldung.concurrent.atomic;
+
+import java.util.concurrent.atomic.AtomicInteger;
+
+public class SafeCounterWithoutLock {
+ private final AtomicInteger counter = new AtomicInteger(0);
+
+ int getValue() {
+ return counter.get();
+ }
+
+ void increment() {
+ while(true) {
+ int existingValue = getValue();
+ int newValue = existingValue + 1;
+ if(counter.compareAndSet(existingValue, newValue)) {
+ return;
+ }
+ }
+ }
+}
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/UnsafeCounter.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/atomic/UnsafeCounter.java
similarity index 94%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/UnsafeCounter.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/atomic/UnsafeCounter.java
index 500ef5bd7e..290c26b73d 100644
--- a/core-java-concurrency/src/main/java/com/baeldung/concurrent/atomic/UnsafeCounter.java
+++ b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/atomic/UnsafeCounter.java
@@ -1,13 +1,13 @@
-package com.baeldung.concurrent.atomic;
-
-public class UnsafeCounter {
- private int counter;
-
- int getValue() {
- return counter;
- }
-
- void increment() {
- counter++;
- }
-}
+package com.baeldung.concurrent.atomic;
+
+public class UnsafeCounter {
+ private int counter;
+
+ int getValue() {
+ return counter;
+ }
+
+ void increment() {
+ counter++;
+ }
+}
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/countdownlatch/BrokenWorker.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/countdownlatch/BrokenWorker.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/countdownlatch/BrokenWorker.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/countdownlatch/BrokenWorker.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/countdownlatch/CountdownLatchCountExample.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/countdownlatch/CountdownLatchCountExample.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/countdownlatch/CountdownLatchCountExample.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/countdownlatch/CountdownLatchCountExample.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/countdownlatch/CountdownLatchResetExample.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/countdownlatch/CountdownLatchResetExample.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/countdownlatch/CountdownLatchResetExample.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/countdownlatch/CountdownLatchResetExample.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/countdownlatch/WaitingWorker.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/countdownlatch/WaitingWorker.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/countdownlatch/WaitingWorker.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/countdownlatch/WaitingWorker.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/countdownlatch/Worker.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/countdownlatch/Worker.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/countdownlatch/Worker.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/countdownlatch/Worker.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCompletionMethodExample.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCompletionMethodExample.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCompletionMethodExample.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCompletionMethodExample.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCountExample.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCountExample.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCountExample.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCountExample.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierDemo.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierDemo.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierDemo.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierDemo.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierResetExample.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierResetExample.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierResetExample.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierResetExample.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/daemon/MultipleThreadsExample.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/daemon/MultipleThreadsExample.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/daemon/MultipleThreadsExample.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/daemon/MultipleThreadsExample.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/daemon/NewThread.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/daemon/NewThread.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/daemon/NewThread.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/daemon/NewThread.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/daemon/SingleThreadExample.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/daemon/SingleThreadExample.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/daemon/SingleThreadExample.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/daemon/SingleThreadExample.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/diningphilosophers/DiningPhilosophers.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/diningphilosophers/DiningPhilosophers.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/diningphilosophers/DiningPhilosophers.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/diningphilosophers/DiningPhilosophers.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/diningphilosophers/Philosopher.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/diningphilosophers/Philosopher.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/diningphilosophers/Philosopher.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/diningphilosophers/Philosopher.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/evenandodd/PrintEvenOddSemaphore.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/evenandodd/PrintEvenOddSemaphore.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/evenandodd/PrintEvenOddSemaphore.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/evenandodd/PrintEvenOddSemaphore.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/evenandodd/PrintEvenOddWaitNotify.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/evenandodd/PrintEvenOddWaitNotify.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/evenandodd/PrintEvenOddWaitNotify.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/evenandodd/PrintEvenOddWaitNotify.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/locks/ReentrantLockWithCondition.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/locks/ReentrantLockWithCondition.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/locks/ReentrantLockWithCondition.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/locks/ReentrantLockWithCondition.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/locks/SharedObjectWithLock.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/locks/SharedObjectWithLock.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/locks/SharedObjectWithLock.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/locks/SharedObjectWithLock.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/locks/StampedLockDemo.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/locks/StampedLockDemo.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/locks/StampedLockDemo.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/locks/StampedLockDemo.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/locks/SynchronizedHashMapWithRWLock.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/locks/SynchronizedHashMapWithRWLock.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/locks/SynchronizedHashMapWithRWLock.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/locks/SynchronizedHashMapWithRWLock.java
diff --git a/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/parameter/AverageCalculator.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/parameter/AverageCalculator.java
new file mode 100644
index 0000000000..a548b5d4a7
--- /dev/null
+++ b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/parameter/AverageCalculator.java
@@ -0,0 +1,20 @@
+package com.baeldung.concurrent.parameter;
+
+import java.util.concurrent.Callable;
+import java.util.stream.IntStream;
+
+public class AverageCalculator implements Callable {
+
+ int[] numbers;
+
+ public AverageCalculator(int... parameter) {
+ this.numbers = parameter == null ? new int[0] : parameter;
+ }
+
+ @Override
+ public Double call() throws Exception {
+ return IntStream.of(this.numbers)
+ .average()
+ .orElse(0d);
+ }
+}
diff --git a/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/parameter/ParameterizedThreadExample.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/parameter/ParameterizedThreadExample.java
new file mode 100644
index 0000000000..73c61f3fb1
--- /dev/null
+++ b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/parameter/ParameterizedThreadExample.java
@@ -0,0 +1,32 @@
+package com.baeldung.concurrent.parameter;
+
+import java.util.concurrent.Callable;
+import java.util.stream.IntStream;
+
+public class ParameterizedThreadExample {
+
+ public static void parameterisedThreadAnonymousClass() {
+ final String parameter = "123";
+ Thread parameterizedThread = new Thread(new Runnable() {
+
+ @Override
+ public void run() {
+ System.out.println(Thread.currentThread()
+ .getName() + " : " + parameter);
+ }
+ });
+
+ parameterizedThread.start();
+ }
+
+ public static Callable sumCalculator(int... numbers) {
+ return () -> numbers != null ? IntStream.of(numbers)
+ .sum() : 0;
+ }
+
+ public static Callable averageCalculator(int... numbers) {
+ return () -> numbers != null ? IntStream.of(numbers)
+ .average()
+ .orElse(0d) : 0d;
+ }
+}
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/phaser/LongRunningAction.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/phaser/LongRunningAction.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/phaser/LongRunningAction.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/phaser/LongRunningAction.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/prioritytaskexecution/Job.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/prioritytaskexecution/Job.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/prioritytaskexecution/Job.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/prioritytaskexecution/Job.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/prioritytaskexecution/JobPriority.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/prioritytaskexecution/JobPriority.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/prioritytaskexecution/JobPriority.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/prioritytaskexecution/JobPriority.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/prioritytaskexecution/PriorityJobScheduler.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/prioritytaskexecution/PriorityJobScheduler.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/prioritytaskexecution/PriorityJobScheduler.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/prioritytaskexecution/PriorityJobScheduler.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/semaphores/CounterUsingMutex.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/semaphores/CounterUsingMutex.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/semaphores/CounterUsingMutex.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/semaphores/CounterUsingMutex.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/semaphores/DelayQueueUsingTimedSemaphore.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/semaphores/DelayQueueUsingTimedSemaphore.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/semaphores/DelayQueueUsingTimedSemaphore.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/semaphores/DelayQueueUsingTimedSemaphore.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/semaphores/LoginQueueUsingSemaphore.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/semaphores/LoginQueueUsingSemaphore.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/semaphores/LoginQueueUsingSemaphore.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/semaphores/LoginQueueUsingSemaphore.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/volatilekeyword/SharedObject.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/volatilekeyword/SharedObject.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/volatilekeyword/SharedObject.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/volatilekeyword/SharedObject.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/yield/ThreadYield.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/yield/ThreadYield.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/yield/ThreadYield.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/concurrent/yield/ThreadYield.java
diff --git a/core-java/src/main/java/com/baeldung/forkjoin/CustomRecursiveAction.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/forkjoin/CustomRecursiveAction.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/forkjoin/CustomRecursiveAction.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/forkjoin/CustomRecursiveAction.java
diff --git a/core-java/src/main/java/com/baeldung/forkjoin/CustomRecursiveTask.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/forkjoin/CustomRecursiveTask.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/forkjoin/CustomRecursiveTask.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/forkjoin/CustomRecursiveTask.java
diff --git a/core-java/src/main/java/com/baeldung/forkjoin/util/PoolUtil.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/forkjoin/util/PoolUtil.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/forkjoin/util/PoolUtil.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/forkjoin/util/PoolUtil.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/threadlocal/Context.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocal/Context.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/threadlocal/Context.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocal/Context.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/threadlocal/SharedMapWithUserContext.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocal/SharedMapWithUserContext.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/threadlocal/SharedMapWithUserContext.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocal/SharedMapWithUserContext.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/threadlocal/ThreadLocalWithUserContext.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocal/ThreadLocalWithUserContext.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/threadlocal/ThreadLocalWithUserContext.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocal/ThreadLocalWithUserContext.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/threadlocal/UserRepository.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocal/UserRepository.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/threadlocal/UserRepository.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocal/UserRepository.java
diff --git a/core-java/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarkRunner.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarkRunner.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarkRunner.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarkRunner.java
diff --git a/core-java/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarker.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarker.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarker.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/threadlocalrandom/ThreadLocalRandomBenchMarker.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/threadpool/CountingTask.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/threadpool/CountingTask.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/threadpool/CountingTask.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/threadpool/CountingTask.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/threadpool/ExitingExecutorServiceExample.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/threadpool/ExitingExecutorServiceExample.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/threadpool/ExitingExecutorServiceExample.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/threadpool/ExitingExecutorServiceExample.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/threadpool/TreeNode.java b/core-java-concurrency-advanced/src/main/java/com/baeldung/threadpool/TreeNode.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/threadpool/TreeNode.java
rename to core-java-concurrency-advanced/src/main/java/com/baeldung/threadpool/TreeNode.java
diff --git a/core-java-concurrency/src/main/java/log4j.properties b/core-java-concurrency-advanced/src/main/java/log4j.properties
similarity index 100%
rename from core-java-concurrency/src/main/java/log4j.properties
rename to core-java-concurrency-advanced/src/main/java/log4j.properties
diff --git a/core-java-concurrency/src/main/resources/logback.xml b/core-java-concurrency-advanced/src/main/resources/logback.xml
similarity index 100%
rename from core-java-concurrency/src/main/resources/logback.xml
rename to core-java-concurrency-advanced/src/main/resources/logback.xml
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/accumulator/LongAccumulatorUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/accumulator/LongAccumulatorUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/accumulator/LongAccumulatorUnitTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/accumulator/LongAccumulatorUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/adder/LongAdderUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/adder/LongAdderUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/adder/LongAdderUnitTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/adder/LongAdderUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/atomic/ThreadSafeCounterIntegrationTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/atomic/ThreadSafeCounterIntegrationTest.java
similarity index 97%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/atomic/ThreadSafeCounterIntegrationTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/atomic/ThreadSafeCounterIntegrationTest.java
index 4eead471f8..c3c44b40cf 100644
--- a/core-java-concurrency/src/test/java/com/baeldung/concurrent/atomic/ThreadSafeCounterIntegrationTest.java
+++ b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/atomic/ThreadSafeCounterIntegrationTest.java
@@ -1,38 +1,38 @@
-package com.baeldung.concurrent.atomic;
-
-import static org.junit.Assert.assertEquals;
-
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
-import java.util.concurrent.TimeUnit;
-import java.util.stream.IntStream;
-
-import org.junit.Test;
-
-public class ThreadSafeCounterIntegrationTest {
-
- @Test
- public void givenMultiThread_whenSafeCounterWithLockIncrement() throws InterruptedException {
- ExecutorService service = Executors.newFixedThreadPool(3);
- SafeCounterWithLock safeCounter = new SafeCounterWithLock();
-
- IntStream.range(0, 1000)
- .forEach(count -> service.submit(safeCounter::increment));
- service.awaitTermination(100, TimeUnit.MILLISECONDS);
-
- assertEquals(1000, safeCounter.getValue());
- }
-
- @Test
- public void givenMultiThread_whenSafeCounterWithoutLockIncrement() throws InterruptedException {
- ExecutorService service = Executors.newFixedThreadPool(3);
- SafeCounterWithoutLock safeCounter = new SafeCounterWithoutLock();
-
- IntStream.range(0, 1000)
- .forEach(count -> service.submit(safeCounter::increment));
- service.awaitTermination(100, TimeUnit.MILLISECONDS);
-
- assertEquals(1000, safeCounter.getValue());
- }
-
-}
+package com.baeldung.concurrent.atomic;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.IntStream;
+
+import org.junit.Test;
+
+public class ThreadSafeCounterIntegrationTest {
+
+ @Test
+ public void givenMultiThread_whenSafeCounterWithLockIncrement() throws InterruptedException {
+ ExecutorService service = Executors.newFixedThreadPool(3);
+ SafeCounterWithLock safeCounter = new SafeCounterWithLock();
+
+ IntStream.range(0, 1000)
+ .forEach(count -> service.submit(safeCounter::increment));
+ service.awaitTermination(100, TimeUnit.MILLISECONDS);
+
+ assertEquals(1000, safeCounter.getValue());
+ }
+
+ @Test
+ public void givenMultiThread_whenSafeCounterWithoutLockIncrement() throws InterruptedException {
+ ExecutorService service = Executors.newFixedThreadPool(3);
+ SafeCounterWithoutLock safeCounter = new SafeCounterWithoutLock();
+
+ IntStream.range(0, 1000)
+ .forEach(count -> service.submit(safeCounter::increment));
+ service.awaitTermination(100, TimeUnit.MILLISECONDS);
+
+ assertEquals(1000, safeCounter.getValue());
+ }
+
+}
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/atomic/ThreadUnsafeCounterManualTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/atomic/ThreadUnsafeCounterManualTest.java
similarity index 97%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/atomic/ThreadUnsafeCounterManualTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/atomic/ThreadUnsafeCounterManualTest.java
index cc7cc18bb5..bf451e58de 100644
--- a/core-java-concurrency/src/test/java/com/baeldung/concurrent/atomic/ThreadUnsafeCounterManualTest.java
+++ b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/atomic/ThreadUnsafeCounterManualTest.java
@@ -1,33 +1,33 @@
-package com.baeldung.concurrent.atomic;
-
-import static org.junit.Assert.assertEquals;
-
-import java.util.concurrent.ExecutorService;
-import java.util.concurrent.Executors;
-import java.util.concurrent.TimeUnit;
-import java.util.stream.IntStream;
-
-import org.junit.Test;
-
-/**
- * This test shows the behaviour of a thread-unsafe class in a multithreaded scenario. We are calling
- * the increment methods 1000 times from a pool of 3 threads. In most of the cases, the counter will
- * less than 1000, because of lost updates, however, occasionally it may reach 1000, when no threads
- * called the method simultaneously. This may cause the build to fail occasionally. Hence excluding this
- * test from build by adding this in manual test
- */
-public class ThreadUnsafeCounterManualTest {
-
- @Test
- public void givenMultiThread_whenUnsafeCounterIncrement() throws InterruptedException {
- ExecutorService service = Executors.newFixedThreadPool(3);
- UnsafeCounter unsafeCounter = new UnsafeCounter();
-
- IntStream.range(0, 1000)
- .forEach(count -> service.submit(unsafeCounter::increment));
- service.awaitTermination(100, TimeUnit.MILLISECONDS);
-
- assertEquals(1000, unsafeCounter.getValue());
- }
-
-}
+package com.baeldung.concurrent.atomic;
+
+import static org.junit.Assert.assertEquals;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.TimeUnit;
+import java.util.stream.IntStream;
+
+import org.junit.Test;
+
+/**
+ * This test shows the behaviour of a thread-unsafe class in a multithreaded scenario. We are calling
+ * the increment methods 1000 times from a pool of 3 threads. In most of the cases, the counter will
+ * less than 1000, because of lost updates, however, occasionally it may reach 1000, when no threads
+ * called the method simultaneously. This may cause the build to fail occasionally. Hence excluding this
+ * test from build by adding this in manual test
+ */
+public class ThreadUnsafeCounterManualTest {
+
+ @Test
+ public void givenMultiThread_whenUnsafeCounterIncrement() throws InterruptedException {
+ ExecutorService service = Executors.newFixedThreadPool(3);
+ UnsafeCounter unsafeCounter = new UnsafeCounter();
+
+ IntStream.range(0, 1000)
+ .forEach(count -> service.submit(unsafeCounter::increment));
+ service.awaitTermination(100, TimeUnit.MILLISECONDS);
+
+ assertEquals(1000, unsafeCounter.getValue());
+ }
+
+}
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchCountExampleUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchCountExampleUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchCountExampleUnitTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchCountExampleUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchExampleIntegrationTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchExampleIntegrationTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchExampleIntegrationTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchExampleIntegrationTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchResetExampleUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchResetExampleUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchResetExampleUnitTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/countdownlatch/CountdownLatchResetExampleUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCompletionMethodExampleUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCompletionMethodExampleUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCompletionMethodExampleUnitTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCompletionMethodExampleUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCountExampleUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCountExampleUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCountExampleUnitTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierCountExampleUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierResetExampleUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierResetExampleUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierResetExampleUnitTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierResetExampleUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/daemon/DaemonThreadUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/daemon/DaemonThreadUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/daemon/DaemonThreadUnitTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/daemon/DaemonThreadUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/locks/SharedObjectWithLockManualTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/locks/SharedObjectWithLockManualTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/locks/SharedObjectWithLockManualTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/locks/SharedObjectWithLockManualTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/locks/SynchronizedHashMapWithRWLockManualTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/locks/SynchronizedHashMapWithRWLockManualTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/locks/SynchronizedHashMapWithRWLockManualTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/locks/SynchronizedHashMapWithRWLockManualTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/phaser/PhaserUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/phaser/PhaserUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/phaser/PhaserUnitTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/phaser/PhaserUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/prioritytaskexecution/PriorityJobSchedulerUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/prioritytaskexecution/PriorityJobSchedulerUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/prioritytaskexecution/PriorityJobSchedulerUnitTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/prioritytaskexecution/PriorityJobSchedulerUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/semaphores/SemaphoresManualTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/semaphores/SemaphoresManualTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/semaphores/SemaphoresManualTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/semaphores/SemaphoresManualTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/volatilekeyword/SharedObjectManualTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/volatilekeyword/SharedObjectManualTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/volatilekeyword/SharedObjectManualTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/concurrent/volatilekeyword/SharedObjectManualTest.java
diff --git a/core-java/src/test/java/com/baeldung/java8/Java8ForkJoinIntegrationTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/java8/Java8ForkJoinIntegrationTest.java
similarity index 100%
rename from core-java/src/test/java/com/baeldung/java8/Java8ForkJoinIntegrationTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/java8/Java8ForkJoinIntegrationTest.java
diff --git a/core-java-concurrency-advanced/src/test/java/com/baeldung/parameters/ParameterizedThreadUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/parameters/ParameterizedThreadUnitTest.java
new file mode 100644
index 0000000000..21b374e609
--- /dev/null
+++ b/core-java-concurrency-advanced/src/test/java/com/baeldung/parameters/ParameterizedThreadUnitTest.java
@@ -0,0 +1,43 @@
+package com.baeldung.parameters;
+
+import com.baeldung.concurrent.parameter.AverageCalculator;
+import org.junit.Test;
+
+import java.util.concurrent.ExecutorService;
+import java.util.concurrent.Executors;
+import java.util.concurrent.Future;
+import java.util.stream.IntStream;
+
+import static org.junit.Assert.assertEquals;
+
+public class ParameterizedThreadUnitTest {
+
+ @Test
+ public void whenSendingParameterToCallable_thenSuccessful() throws Exception {
+ ExecutorService executorService = Executors.newSingleThreadExecutor();
+ Future result = executorService.submit(new AverageCalculator(1, 2, 3));
+ try {
+ assertEquals(Double.valueOf(2.0), result.get());
+ } finally {
+ executorService.shutdown();
+ }
+ }
+
+ @Test
+ public void whenParametersToThreadWithLamda_thenParametersPassedCorrectly() throws Exception {
+ ExecutorService executorService = Executors.newFixedThreadPool(2);
+ int[] numbers = new int[] { 4, 5, 6 };
+ try {
+ Future sumResult = executorService.submit(() -> IntStream.of(numbers)
+ .sum());
+ Future averageResult = executorService.submit(() -> IntStream.of(numbers)
+ .average()
+ .orElse(0d));
+ assertEquals(Integer.valueOf(15), sumResult.get());
+ assertEquals(Double.valueOf(5.0), averageResult.get());
+ } finally {
+ executorService.shutdown();
+ }
+ }
+
+}
diff --git a/core-java/src/test/java/com/baeldung/thread/join/ThreadJoinUnitTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/thread/join/ThreadJoinUnitTest.java
similarity index 100%
rename from core-java/src/test/java/com/baeldung/thread/join/ThreadJoinUnitTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/thread/join/ThreadJoinUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/threadlocal/ThreadLocalIntegrationTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/threadlocal/ThreadLocalIntegrationTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/threadlocal/ThreadLocalIntegrationTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/threadlocal/ThreadLocalIntegrationTest.java
diff --git a/core-java/src/test/java/com/baeldung/threadlocalrandom/ThreadLocalRandomIntegrationTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/threadlocalrandom/ThreadLocalRandomIntegrationTest.java
similarity index 100%
rename from core-java/src/test/java/com/baeldung/threadlocalrandom/ThreadLocalRandomIntegrationTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/threadlocalrandom/ThreadLocalRandomIntegrationTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/threadpool/CoreThreadPoolIntegrationTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/threadpool/CoreThreadPoolIntegrationTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/threadpool/CoreThreadPoolIntegrationTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/threadpool/CoreThreadPoolIntegrationTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/threadpool/GuavaThreadPoolIntegrationTest.java b/core-java-concurrency-advanced/src/test/java/com/baeldung/threadpool/GuavaThreadPoolIntegrationTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/threadpool/GuavaThreadPoolIntegrationTest.java
rename to core-java-concurrency-advanced/src/test/java/com/baeldung/threadpool/GuavaThreadPoolIntegrationTest.java
diff --git a/core-java-concurrency/src/test/resources/.gitignore b/core-java-concurrency-advanced/src/test/resources/.gitignore
similarity index 100%
rename from core-java-concurrency/src/test/resources/.gitignore
rename to core-java-concurrency-advanced/src/test/resources/.gitignore
diff --git a/core-java-concurrency-basic/.gitignore b/core-java-concurrency-basic/.gitignore
new file mode 100644
index 0000000000..3de4cc647e
--- /dev/null
+++ b/core-java-concurrency-basic/.gitignore
@@ -0,0 +1,26 @@
+*.class
+
+0.*
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+.resourceCache
+
+# Packaged files #
+*.jar
+*.war
+*.ear
+
+# Files generated by integration tests
+*.txt
+backup-pom.xml
+/bin/
+/temp
+
+#IntelliJ specific
+.idea/
+*.iml
\ No newline at end of file
diff --git a/core-java-concurrency-basic/README.md b/core-java-concurrency-basic/README.md
new file mode 100644
index 0000000000..1c43149d03
--- /dev/null
+++ b/core-java-concurrency-basic/README.md
@@ -0,0 +1,17 @@
+=========
+
+## Core Java Concurrency Basic Examples
+
+### Relevant Articles:
+- [Guide To CompletableFuture](http://www.baeldung.com/java-completablefuture)
+- [A Guide to the Java ExecutorService](http://www.baeldung.com/java-executor-service-tutorial)
+- [Guide to java.util.concurrent.Future](http://www.baeldung.com/java-future)
+- [Difference Between Wait and Sleep in Java](http://www.baeldung.com/java-wait-and-sleep)
+- [Guide to Synchronized Keyword in Java](http://www.baeldung.com/java-synchronized)
+- [Overview of the java.util.concurrent](http://www.baeldung.com/java-util-concurrent)
+- [Implementing a Runnable vs Extending a Thread](http://www.baeldung.com/java-runnable-vs-extending-thread)
+- [How to Kill a Java Thread](http://www.baeldung.com/java-thread-stop)
+- [ExecutorService - Waiting for Threads to Finish](http://www.baeldung.com/java-executor-wait-for-threads)
+- [wait and notify() Methods in Java](http://www.baeldung.com/java-wait-notify)
+- [Life Cycle of a Thread in Java](http://www.baeldung.com/java-thread-lifecycle)
+- [Runnable vs. Callable in Java](http://www.baeldung.com/java-runnable-callable)
\ No newline at end of file
diff --git a/core-java-concurrency-basic/pom.xml b/core-java-concurrency-basic/pom.xml
new file mode 100644
index 0000000000..3544403aca
--- /dev/null
+++ b/core-java-concurrency-basic/pom.xml
@@ -0,0 +1,55 @@
+
+ 4.0.0
+ com.baeldung
+ core-java-concurrency-basic
+ 0.1.0-SNAPSHOT
+ jar
+ core-java-concurrency-basic
+
+
+ com.baeldung
+ parent-java
+ 0.0.1-SNAPSHOT
+ ../parent-java
+
+
+
+
+ org.apache.commons
+ commons-lang3
+ ${commons-lang3.version}
+
+
+ org.assertj
+ assertj-core
+ ${assertj.version}
+ test
+
+
+ com.jayway.awaitility
+ awaitility
+ ${avaitility.version}
+ test
+
+
+
+
+ core-java-concurrency-basic
+
+
+ src/main/resources
+ true
+
+
+
+
+
+
+ 3.5
+
+ 3.6.1
+ 1.7.0
+
+
+
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/Scheduledexecutorservice/ScheduledExecutorServiceDemo.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/Scheduledexecutorservice/ScheduledExecutorServiceDemo.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/Scheduledexecutorservice/ScheduledExecutorServiceDemo.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/Scheduledexecutorservice/ScheduledExecutorServiceDemo.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/callable/FactorialTask.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/callable/FactorialTask.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/callable/FactorialTask.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/callable/FactorialTask.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierExample.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierExample.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierExample.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/cyclicbarrier/CyclicBarrierExample.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/Task.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/cyclicbarrier/Task.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/cyclicbarrier/Task.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/cyclicbarrier/Task.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/executor/ExecutorDemo.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/executor/ExecutorDemo.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/executor/ExecutorDemo.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/executor/ExecutorDemo.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/executor/Invoker.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/executor/Invoker.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/executor/Invoker.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/executor/Invoker.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/executorservice/DelayedCallable.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/executorservice/DelayedCallable.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/executorservice/DelayedCallable.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/executorservice/DelayedCallable.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/executorservice/ExecutorServiceDemo.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/executorservice/ExecutorServiceDemo.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/executorservice/ExecutorServiceDemo.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/executorservice/ExecutorServiceDemo.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/executorservice/Task.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/executorservice/Task.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/executorservice/Task.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/executorservice/Task.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/future/FactorialSquareCalculator.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/future/FactorialSquareCalculator.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/future/FactorialSquareCalculator.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/future/FactorialSquareCalculator.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/future/FutureDemo.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/future/FutureDemo.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/future/FutureDemo.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/future/FutureDemo.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/future/SquareCalculator.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/future/SquareCalculator.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/future/SquareCalculator.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/future/SquareCalculator.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/runnable/EventLoggingTask.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/runnable/EventLoggingTask.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/runnable/EventLoggingTask.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/runnable/EventLoggingTask.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/runnable/TaskRunner.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/runnable/TaskRunner.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/runnable/TaskRunner.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/runnable/TaskRunner.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/semaphore/SemaPhoreDemo.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/semaphore/SemaPhoreDemo.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/semaphore/SemaPhoreDemo.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/semaphore/SemaPhoreDemo.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/sleepwait/ThreadA.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/sleepwait/ThreadA.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/sleepwait/ThreadA.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/sleepwait/ThreadA.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/sleepwait/ThreadB.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/sleepwait/ThreadB.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/sleepwait/ThreadB.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/sleepwait/ThreadB.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/sleepwait/WaitSleepExample.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/sleepwait/WaitSleepExample.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/sleepwait/WaitSleepExample.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/sleepwait/WaitSleepExample.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/stopping/ControlSubThread.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/stopping/ControlSubThread.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/stopping/ControlSubThread.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/stopping/ControlSubThread.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizedBlocks.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizedBlocks.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizedBlocks.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizedBlocks.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizedMethods.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizedMethods.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizedMethods.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizedMethods.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/threadfactory/BaeldungThreadFactory.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadfactory/BaeldungThreadFactory.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/threadfactory/BaeldungThreadFactory.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadfactory/BaeldungThreadFactory.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/threadfactory/Demo.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadfactory/Demo.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/threadfactory/Demo.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadfactory/Demo.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/threadfactory/Task.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadfactory/Task.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/threadfactory/Task.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadfactory/Task.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/BlockedState.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/BlockedState.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/BlockedState.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/BlockedState.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/NewState.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/NewState.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/NewState.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/NewState.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/RunnableState.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/RunnableState.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/RunnableState.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/RunnableState.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/TerminatedState.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/TerminatedState.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/TerminatedState.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/TerminatedState.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/TimedWaitingState.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/TimedWaitingState.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/TimedWaitingState.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/TimedWaitingState.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/WaitingState.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/WaitingState.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/threadlifecycle/WaitingState.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/threadlifecycle/WaitingState.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/Data.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/waitandnotify/Data.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/Data.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/waitandnotify/Data.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/NetworkDriver.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/waitandnotify/NetworkDriver.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/NetworkDriver.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/waitandnotify/NetworkDriver.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/Receiver.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/waitandnotify/Receiver.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/Receiver.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/waitandnotify/Receiver.java
diff --git a/core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/Sender.java b/core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/waitandnotify/Sender.java
similarity index 100%
rename from core-java-concurrency/src/main/java/com/baeldung/concurrent/waitandnotify/Sender.java
rename to core-java-concurrency-basic/src/main/java/com/baeldung/concurrent/waitandnotify/Sender.java
diff --git a/spring-mustache/src/main/resources/logback.xml b/core-java-concurrency-basic/src/main/resources/logback.xml
similarity index 57%
rename from spring-mustache/src/main/resources/logback.xml
rename to core-java-concurrency-basic/src/main/resources/logback.xml
index 7d900d8ea8..56af2d397e 100644
--- a/spring-mustache/src/main/resources/logback.xml
+++ b/core-java-concurrency-basic/src/main/resources/logback.xml
@@ -7,6 +7,12 @@
+
+
+
+
+
+
diff --git a/core-java-concurrency/src/test/java/com/baeldung/completablefuture/CompletableFutureLongRunningUnitTest.java b/core-java-concurrency-basic/src/test/java/com/baeldung/completablefuture/CompletableFutureLongRunningUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/completablefuture/CompletableFutureLongRunningUnitTest.java
rename to core-java-concurrency-basic/src/test/java/com/baeldung/completablefuture/CompletableFutureLongRunningUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/callable/FactorialTaskManualTest.java b/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/callable/FactorialTaskManualTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/callable/FactorialTaskManualTest.java
rename to core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/callable/FactorialTaskManualTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/executorservice/WaitingForThreadsToFinishManualTest.java b/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/executorservice/WaitingForThreadsToFinishManualTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/executorservice/WaitingForThreadsToFinishManualTest.java
rename to core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/executorservice/WaitingForThreadsToFinishManualTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/future/FactorialSquareCalculatorUnitTest.java b/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/future/FactorialSquareCalculatorUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/future/FactorialSquareCalculatorUnitTest.java
rename to core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/future/FactorialSquareCalculatorUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/future/SquareCalculatorIntegrationTest.java b/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/future/SquareCalculatorIntegrationTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/future/SquareCalculatorIntegrationTest.java
rename to core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/future/SquareCalculatorIntegrationTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/runnable/RunnableVsThreadLiveTest.java b/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/runnable/RunnableVsThreadLiveTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/runnable/RunnableVsThreadLiveTest.java
rename to core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/runnable/RunnableVsThreadLiveTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/stopping/StopThreadManualTest.java b/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/stopping/StopThreadManualTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/stopping/StopThreadManualTest.java
rename to core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/stopping/StopThreadManualTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/synchronize/BaeldungSychronizedBlockUnitTest.java b/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/synchronize/BaeldungSychronizedBlockUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/synchronize/BaeldungSychronizedBlockUnitTest.java
rename to core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/synchronize/BaeldungSychronizedBlockUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizeMethodsUnitTest.java b/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizeMethodsUnitTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizeMethodsUnitTest.java
rename to core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/synchronize/BaeldungSynchronizeMethodsUnitTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/concurrent/waitandnotify/NetworkIntegrationTest.java b/core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/waitandnotify/NetworkIntegrationTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/concurrent/waitandnotify/NetworkIntegrationTest.java
rename to core-java-concurrency-basic/src/test/java/com/baeldung/concurrent/waitandnotify/NetworkIntegrationTest.java
diff --git a/core-java-concurrency/src/test/java/com/baeldung/java8/Java8ExecutorServiceIntegrationTest.java b/core-java-concurrency-basic/src/test/java/com/baeldung/java8/Java8ExecutorServiceIntegrationTest.java
similarity index 100%
rename from core-java-concurrency/src/test/java/com/baeldung/java8/Java8ExecutorServiceIntegrationTest.java
rename to core-java-concurrency-basic/src/test/java/com/baeldung/java8/Java8ExecutorServiceIntegrationTest.java
diff --git a/spring-rest-template/.gitignore b/core-java-concurrency-basic/src/test/resources/.gitignore
similarity index 92%
rename from spring-rest-template/.gitignore
rename to core-java-concurrency-basic/src/test/resources/.gitignore
index afdfaa6ded..83c05e60c8 100644
--- a/spring-rest-template/.gitignore
+++ b/core-java-concurrency-basic/src/test/resources/.gitignore
@@ -6,7 +6,6 @@
/data
/src/main/webapp/WEB-INF/classes
*/META-INF/*
-*/.idea/*
# Packaged files #
*.jar
diff --git a/core-java-io/pom.xml b/core-java-io/pom.xml
index efa32b8e3e..ac5f1f7c2e 100644
--- a/core-java-io/pom.xml
+++ b/core-java-io/pom.xml
@@ -236,7 +236,7 @@
- 2.8.5
+ 2.9.73.5
diff --git a/core-java-io/src/main/java/com/baeldung/download/FileDownload.java b/core-java-io/src/main/java/com/baeldung/download/FileDownload.java
index c7dd154023..a099406d4c 100644
--- a/core-java-io/src/main/java/com/baeldung/download/FileDownload.java
+++ b/core-java-io/src/main/java/com/baeldung/download/FileDownload.java
@@ -45,6 +45,7 @@ public class FileDownload {
FileOutputStream fileOutputStream = new FileOutputStream(localFilename); FileChannel fileChannel = fileOutputStream.getChannel()) {
fileChannel.transferFrom(readableByteChannel, 0, Long.MAX_VALUE);
+ fileOutputStream.close();
}
}
diff --git a/core-java-lang-oop/.gitignore b/core-java-lang-oop/.gitignore
new file mode 100644
index 0000000000..3de4cc647e
--- /dev/null
+++ b/core-java-lang-oop/.gitignore
@@ -0,0 +1,26 @@
+*.class
+
+0.*
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+.resourceCache
+
+# Packaged files #
+*.jar
+*.war
+*.ear
+
+# Files generated by integration tests
+*.txt
+backup-pom.xml
+/bin/
+/temp
+
+#IntelliJ specific
+.idea/
+*.iml
\ No newline at end of file
diff --git a/core-java-lang-oop/README.md b/core-java-lang-oop/README.md
new file mode 100644
index 0000000000..bbc3d26c99
--- /dev/null
+++ b/core-java-lang-oop/README.md
@@ -0,0 +1,24 @@
+=========
+
+## Core Java Lang OOP Cookbooks and Examples
+
+### Relevant Articles:
+- [Guide to hashCode() in Java](http://www.baeldung.com/java-hashcode)
+- [A Guide to the Static Keyword in Java](http://www.baeldung.com/java-static)
+- [A Guide to Java Initialization](http://www.baeldung.com/java-initialization)
+- [Polymorphism in Java](http://www.baeldung.com/java-polymorphism)
+- [Method Overloading and Overriding in Java](http://www.baeldung.com/java-method-overload-override)
+- [How to Make a Deep Copy of an Object in Java](http://www.baeldung.com/java-deep-copy)
+- [Guide to Inheritance in Java](http://www.baeldung.com/java-inheritance)
+- [Object Type Casting in Java](http://www.baeldung.com/java-type-casting)
+- [The "final" Keyword in Java](http://www.baeldung.com/java-final)
+- [Type Erasure in Java Explained](http://www.baeldung.com/java-type-erasure)
+- [Pass-By-Value as a Parameter Passing Mechanism in Java](http://www.baeldung.com/java-pass-by-value-or-pass-by-reference)
+- [Variable and Method Hiding in Java](http://www.baeldung.com/java-variable-method-hiding)
+- [Access Modifiers in Java](http://www.baeldung.com/java-access-modifiers)
+- [Guide to the super Java Keyword](http://www.baeldung.com/java-super)
+- [Guide to the this Java Keyword](http://www.baeldung.com/java-this)
+- [Immutable Objects in Java](http://www.baeldung.com/java-immutable-object)
+- [Inheritance and Composition (Is-a vs Has-a relationship) in Java](http://www.baeldung.com/java-inheritance-composition)
+- [A Guide to Constructors in Java](https://www.baeldung.com/java-constructors)
+- [Java equals() and hashCode() Contracts](https://www.baeldung.com/java-equals-hashcode-contracts)
diff --git a/core-java-lang-oop/pom.xml b/core-java-lang-oop/pom.xml
new file mode 100644
index 0000000000..262408c024
--- /dev/null
+++ b/core-java-lang-oop/pom.xml
@@ -0,0 +1,91 @@
+
+ 4.0.0
+ com.baeldung
+ core-java-lang-oop
+ 0.1.0-SNAPSHOT
+ jar
+ core-java-lang-oop
+
+
+ com.baeldung
+ parent-java
+ 0.0.1-SNAPSHOT
+ ../parent-java
+
+
+
+
+ org.apache.commons
+ commons-lang3
+ ${commons-lang3.version}
+
+
+
+
+ com.fasterxml.jackson.core
+ jackson-databind
+ ${jackson.version}
+
+
+ com.google.code.gson
+ gson
+ ${gson.version}
+
+
+
+ log4j
+ log4j
+ ${log4j.version}
+
+
+ org.slf4j
+ log4j-over-slf4j
+ ${org.slf4j.version}
+
+
+ org.projectlombok
+ lombok
+ ${lombok.version}
+ provided
+
+
+
+ org.assertj
+ assertj-core
+ ${assertj-core.version}
+ test
+
+
+ nl.jqno.equalsverifier
+ equalsverifier
+ ${equalsverifier.version}
+ test
+
+
+
+
+ core-java-lang-oop
+
+
+ src/main/resources
+ true
+
+
+
+
+
+
+
+ 2.8.5
+ 2.8.2
+
+
+ 3.5
+ 1.16.12
+
+ 3.10.0
+ 3.0.3
+
+
+
diff --git a/core-java-lang/src/main/java/com/baeldung/accessmodifiers/Public.java b/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/Public.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/accessmodifiers/Public.java
rename to core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/Public.java
diff --git a/core-java-lang/src/main/java/com/baeldung/accessmodifiers/SubClass.java b/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/SubClass.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/accessmodifiers/SubClass.java
rename to core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/SubClass.java
diff --git a/core-java-lang/src/main/java/com/baeldung/accessmodifiers/SuperPublic.java b/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/SuperPublic.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/accessmodifiers/SuperPublic.java
rename to core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/SuperPublic.java
diff --git a/core-java-lang/src/main/java/com/baeldung/accessmodifiers/another/AnotherPublic.java b/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/another/AnotherPublic.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/accessmodifiers/another/AnotherPublic.java
rename to core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/another/AnotherPublic.java
diff --git a/core-java-lang/src/main/java/com/baeldung/accessmodifiers/another/AnotherSubClass.java b/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/another/AnotherSubClass.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/accessmodifiers/another/AnotherSubClass.java
rename to core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/another/AnotherSubClass.java
diff --git a/core-java-lang/src/main/java/com/baeldung/accessmodifiers/another/AnotherSuperPublic.java b/core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/another/AnotherSuperPublic.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/accessmodifiers/another/AnotherSuperPublic.java
rename to core-java-lang-oop/src/main/java/com/baeldung/accessmodifiers/another/AnotherSuperPublic.java
diff --git a/core-java-lang/src/main/java/com/baeldung/casting/Animal.java b/core-java-lang-oop/src/main/java/com/baeldung/casting/Animal.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/casting/Animal.java
rename to core-java-lang-oop/src/main/java/com/baeldung/casting/Animal.java
diff --git a/core-java-lang/src/main/java/com/baeldung/casting/AnimalFeeder.java b/core-java-lang-oop/src/main/java/com/baeldung/casting/AnimalFeeder.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/casting/AnimalFeeder.java
rename to core-java-lang-oop/src/main/java/com/baeldung/casting/AnimalFeeder.java
diff --git a/core-java-lang/src/main/java/com/baeldung/casting/AnimalFeederGeneric.java b/core-java-lang-oop/src/main/java/com/baeldung/casting/AnimalFeederGeneric.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/casting/AnimalFeederGeneric.java
rename to core-java-lang-oop/src/main/java/com/baeldung/casting/AnimalFeederGeneric.java
diff --git a/core-java-lang/src/main/java/com/baeldung/casting/Cat.java b/core-java-lang-oop/src/main/java/com/baeldung/casting/Cat.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/casting/Cat.java
rename to core-java-lang-oop/src/main/java/com/baeldung/casting/Cat.java
diff --git a/core-java-lang/src/main/java/com/baeldung/casting/Dog.java b/core-java-lang-oop/src/main/java/com/baeldung/casting/Dog.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/casting/Dog.java
rename to core-java-lang-oop/src/main/java/com/baeldung/casting/Dog.java
diff --git a/core-java-lang/src/main/java/com/baeldung/casting/Mew.java b/core-java-lang-oop/src/main/java/com/baeldung/casting/Mew.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/casting/Mew.java
rename to core-java-lang-oop/src/main/java/com/baeldung/casting/Mew.java
diff --git a/core-java-lang/src/main/java/com/baeldung/constructors/BankAccount.java b/core-java-lang-oop/src/main/java/com/baeldung/constructors/BankAccount.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/constructors/BankAccount.java
rename to core-java-lang-oop/src/main/java/com/baeldung/constructors/BankAccount.java
diff --git a/core-java-lang/src/main/java/com/baeldung/constructors/Transaction.java b/core-java-lang-oop/src/main/java/com/baeldung/constructors/Transaction.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/constructors/Transaction.java
rename to core-java-lang-oop/src/main/java/com/baeldung/constructors/Transaction.java
diff --git a/core-java-lang/src/main/java/com/baeldung/deepcopy/Address.java b/core-java-lang-oop/src/main/java/com/baeldung/deepcopy/Address.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/deepcopy/Address.java
rename to core-java-lang-oop/src/main/java/com/baeldung/deepcopy/Address.java
diff --git a/core-java-lang/src/main/java/com/baeldung/deepcopy/User.java b/core-java-lang-oop/src/main/java/com/baeldung/deepcopy/User.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/deepcopy/User.java
rename to core-java-lang-oop/src/main/java/com/baeldung/deepcopy/User.java
diff --git a/core-java-lang/src/main/java/com/baeldung/equalshashcode/Money.java b/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/Money.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/equalshashcode/Money.java
rename to core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/Money.java
diff --git a/core-java-lang/src/main/java/com/baeldung/equalshashcode/Team.java b/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/Team.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/equalshashcode/Team.java
rename to core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/Team.java
diff --git a/core-java-lang/src/main/java/com/baeldung/equalshashcode/Voucher.java b/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/Voucher.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/equalshashcode/Voucher.java
rename to core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/Voucher.java
diff --git a/core-java-lang/src/main/java/com/baeldung/equalshashcode/WrongTeam.java b/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/WrongTeam.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/equalshashcode/WrongTeam.java
rename to core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/WrongTeam.java
diff --git a/core-java-lang/src/main/java/com/baeldung/equalshashcode/WrongVoucher.java b/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/WrongVoucher.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/equalshashcode/WrongVoucher.java
rename to core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/WrongVoucher.java
diff --git a/core-java-lang/src/main/java/com/baeldung/equalshashcode/entities/ComplexClass.java b/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/ComplexClass.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/equalshashcode/entities/ComplexClass.java
rename to core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/ComplexClass.java
diff --git a/core-java-lang/src/main/java/com/baeldung/equalshashcode/entities/PrimitiveClass.java b/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/PrimitiveClass.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/equalshashcode/entities/PrimitiveClass.java
rename to core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/PrimitiveClass.java
diff --git a/core-java-lang/src/main/java/com/baeldung/equalshashcode/entities/Rectangle.java b/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/Rectangle.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/equalshashcode/entities/Rectangle.java
rename to core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/Rectangle.java
diff --git a/core-java-lang/src/main/java/com/baeldung/equalshashcode/entities/Shape.java b/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/Shape.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/equalshashcode/entities/Shape.java
rename to core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/Shape.java
diff --git a/core-java-lang/src/main/java/com/baeldung/equalshashcode/entities/Square.java b/core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/Square.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/equalshashcode/entities/Square.java
rename to core-java-lang-oop/src/main/java/com/baeldung/equalshashcode/entities/Square.java
diff --git a/core-java-lang/src/main/java/com/baeldung/finalkeyword/BlackCat.java b/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/BlackCat.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/finalkeyword/BlackCat.java
rename to core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/BlackCat.java
diff --git a/core-java-lang/src/main/java/com/baeldung/finalkeyword/BlackDog.java b/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/BlackDog.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/finalkeyword/BlackDog.java
rename to core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/BlackDog.java
diff --git a/core-java-lang/src/main/java/com/baeldung/finalkeyword/Cat.java b/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/Cat.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/finalkeyword/Cat.java
rename to core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/Cat.java
diff --git a/core-java-lang/src/main/java/com/baeldung/finalkeyword/Dog.java b/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/Dog.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/finalkeyword/Dog.java
rename to core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/Dog.java
diff --git a/core-java-lang/src/main/java/com/baeldung/hashcode/entities/User.java b/core-java-lang-oop/src/main/java/com/baeldung/hashcode/entities/User.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/hashcode/entities/User.java
rename to core-java-lang-oop/src/main/java/com/baeldung/hashcode/entities/User.java
diff --git a/core-java-lang/src/main/java/com/baeldung/immutableobjects/Currency.java b/core-java-lang-oop/src/main/java/com/baeldung/immutableobjects/Currency.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/immutableobjects/Currency.java
rename to core-java-lang-oop/src/main/java/com/baeldung/immutableobjects/Currency.java
diff --git a/core-java-lang/src/main/java/com/baeldung/immutableobjects/Money.java b/core-java-lang-oop/src/main/java/com/baeldung/immutableobjects/Money.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/immutableobjects/Money.java
rename to core-java-lang-oop/src/main/java/com/baeldung/immutableobjects/Money.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritance/ArmoredCar.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritance/ArmoredCar.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritance/ArmoredCar.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritance/ArmoredCar.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritance/BMW.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritance/BMW.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritance/BMW.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritance/BMW.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritance/Car.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritance/Car.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritance/Car.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritance/Car.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritance/Employee.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritance/Employee.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritance/Employee.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritance/Employee.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritance/Floatable.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritance/Floatable.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritance/Floatable.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritance/Floatable.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritance/Flyable.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritance/Flyable.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritance/Flyable.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritance/Flyable.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritance/SpaceCar.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritance/SpaceCar.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritance/SpaceCar.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritance/SpaceCar.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritance/SpaceTraveller.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritance/SpaceTraveller.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritance/SpaceTraveller.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritance/SpaceTraveller.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritancecomposition/application/Application.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/application/Application.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritancecomposition/application/Application.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/application/Application.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Actress.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Actress.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Actress.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Actress.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Computer.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Computer.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Computer.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Computer.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Memory.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Memory.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Memory.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Memory.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Person.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Person.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Person.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Person.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Processor.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Processor.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Processor.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Processor.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/SoundCard.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/SoundCard.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/SoundCard.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/SoundCard.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/StandardMemory.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/StandardMemory.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/StandardMemory.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/StandardMemory.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/StandardProcessor.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/StandardProcessor.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/StandardProcessor.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/StandardProcessor.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/StandardSoundCard.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/StandardSoundCard.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/StandardSoundCard.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/StandardSoundCard.java
diff --git a/core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Waitress.java b/core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Waitress.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/inheritancecomposition/model/Waitress.java
rename to core-java-lang-oop/src/main/java/com/baeldung/inheritancecomposition/model/Waitress.java
diff --git a/core-java-lang/src/main/java/com/baeldung/initializationguide/User.java b/core-java-lang-oop/src/main/java/com/baeldung/initializationguide/User.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/initializationguide/User.java
rename to core-java-lang-oop/src/main/java/com/baeldung/initializationguide/User.java
diff --git a/core-java-lang/src/main/java/com/baeldung/keyword/KeywordDemo.java b/core-java-lang-oop/src/main/java/com/baeldung/keyword/KeywordDemo.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/keyword/KeywordDemo.java
rename to core-java-lang-oop/src/main/java/com/baeldung/keyword/KeywordDemo.java
diff --git a/core-java-lang/src/main/java/com/baeldung/keyword/superkeyword/SuperBase.java b/core-java-lang-oop/src/main/java/com/baeldung/keyword/superkeyword/SuperBase.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/keyword/superkeyword/SuperBase.java
rename to core-java-lang-oop/src/main/java/com/baeldung/keyword/superkeyword/SuperBase.java
diff --git a/core-java-lang/src/main/java/com/baeldung/keyword/superkeyword/SuperSub.java b/core-java-lang-oop/src/main/java/com/baeldung/keyword/superkeyword/SuperSub.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/keyword/superkeyword/SuperSub.java
rename to core-java-lang-oop/src/main/java/com/baeldung/keyword/superkeyword/SuperSub.java
diff --git a/core-java-lang/src/main/java/com/baeldung/keyword/thiskeyword/KeywordUnitTest.java b/core-java-lang-oop/src/main/java/com/baeldung/keyword/thiskeyword/KeywordUnitTest.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/keyword/thiskeyword/KeywordUnitTest.java
rename to core-java-lang-oop/src/main/java/com/baeldung/keyword/thiskeyword/KeywordUnitTest.java
diff --git a/core-java-lang/src/main/java/com/baeldung/methodoverloadingoverriding/application/Application.java b/core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/application/Application.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/methodoverloadingoverriding/application/Application.java
rename to core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/application/Application.java
diff --git a/core-java-lang/src/main/java/com/baeldung/methodoverloadingoverriding/model/Car.java b/core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/model/Car.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/methodoverloadingoverriding/model/Car.java
rename to core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/model/Car.java
diff --git a/core-java-lang/src/main/java/com/baeldung/methodoverloadingoverriding/model/Vehicle.java b/core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/model/Vehicle.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/methodoverloadingoverriding/model/Vehicle.java
rename to core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/model/Vehicle.java
diff --git a/core-java-lang/src/main/java/com/baeldung/methodoverloadingoverriding/util/Multiplier.java b/core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/util/Multiplier.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/methodoverloadingoverriding/util/Multiplier.java
rename to core-java-lang-oop/src/main/java/com/baeldung/methodoverloadingoverriding/util/Multiplier.java
diff --git a/core-java-lang/src/main/java/com/baeldung/polymorphism/FileManager.java b/core-java-lang-oop/src/main/java/com/baeldung/polymorphism/FileManager.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/polymorphism/FileManager.java
rename to core-java-lang-oop/src/main/java/com/baeldung/polymorphism/FileManager.java
diff --git a/core-java-lang/src/main/java/com/baeldung/polymorphism/GenericFile.java b/core-java-lang-oop/src/main/java/com/baeldung/polymorphism/GenericFile.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/polymorphism/GenericFile.java
rename to core-java-lang-oop/src/main/java/com/baeldung/polymorphism/GenericFile.java
diff --git a/core-java-lang/src/main/java/com/baeldung/polymorphism/ImageFile.java b/core-java-lang-oop/src/main/java/com/baeldung/polymorphism/ImageFile.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/polymorphism/ImageFile.java
rename to core-java-lang-oop/src/main/java/com/baeldung/polymorphism/ImageFile.java
diff --git a/core-java-lang/src/main/java/com/baeldung/polymorphism/TextFile.java b/core-java-lang-oop/src/main/java/com/baeldung/polymorphism/TextFile.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/polymorphism/TextFile.java
rename to core-java-lang-oop/src/main/java/com/baeldung/polymorphism/TextFile.java
diff --git a/core-java-lang/src/main/java/com/baeldung/scope/method/BaseMethodClass.java b/core-java-lang-oop/src/main/java/com/baeldung/scope/method/BaseMethodClass.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/scope/method/BaseMethodClass.java
rename to core-java-lang-oop/src/main/java/com/baeldung/scope/method/BaseMethodClass.java
diff --git a/core-java-lang/src/main/java/com/baeldung/scope/method/ChildMethodClass.java b/core-java-lang-oop/src/main/java/com/baeldung/scope/method/ChildMethodClass.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/scope/method/ChildMethodClass.java
rename to core-java-lang-oop/src/main/java/com/baeldung/scope/method/ChildMethodClass.java
diff --git a/core-java-lang/src/main/java/com/baeldung/scope/method/MethodHidingDemo.java b/core-java-lang-oop/src/main/java/com/baeldung/scope/method/MethodHidingDemo.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/scope/method/MethodHidingDemo.java
rename to core-java-lang-oop/src/main/java/com/baeldung/scope/method/MethodHidingDemo.java
diff --git a/core-java-lang/src/main/java/com/baeldung/scope/variable/ChildVariable.java b/core-java-lang-oop/src/main/java/com/baeldung/scope/variable/ChildVariable.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/scope/variable/ChildVariable.java
rename to core-java-lang-oop/src/main/java/com/baeldung/scope/variable/ChildVariable.java
diff --git a/core-java-lang/src/main/java/com/baeldung/scope/variable/HideVariable.java b/core-java-lang-oop/src/main/java/com/baeldung/scope/variable/HideVariable.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/scope/variable/HideVariable.java
rename to core-java-lang-oop/src/main/java/com/baeldung/scope/variable/HideVariable.java
diff --git a/core-java-lang/src/main/java/com/baeldung/scope/variable/ParentVariable.java b/core-java-lang-oop/src/main/java/com/baeldung/scope/variable/ParentVariable.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/scope/variable/ParentVariable.java
rename to core-java-lang-oop/src/main/java/com/baeldung/scope/variable/ParentVariable.java
diff --git a/core-java-lang/src/main/java/com/baeldung/scope/variable/VariableHidingDemo.java b/core-java-lang-oop/src/main/java/com/baeldung/scope/variable/VariableHidingDemo.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/scope/variable/VariableHidingDemo.java
rename to core-java-lang-oop/src/main/java/com/baeldung/scope/variable/VariableHidingDemo.java
diff --git a/core-java-lang/src/main/java/com/baeldung/staticdemo/Car.java b/core-java-lang-oop/src/main/java/com/baeldung/staticdemo/Car.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/staticdemo/Car.java
rename to core-java-lang-oop/src/main/java/com/baeldung/staticdemo/Car.java
diff --git a/core-java-lang/src/main/java/com/baeldung/staticdemo/Singleton.java b/core-java-lang-oop/src/main/java/com/baeldung/staticdemo/Singleton.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/staticdemo/Singleton.java
rename to core-java-lang-oop/src/main/java/com/baeldung/staticdemo/Singleton.java
diff --git a/core-java-lang/src/main/java/com/baeldung/staticdemo/StaticBlock.java b/core-java-lang-oop/src/main/java/com/baeldung/staticdemo/StaticBlock.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/staticdemo/StaticBlock.java
rename to core-java-lang-oop/src/main/java/com/baeldung/staticdemo/StaticBlock.java
diff --git a/core-java-lang/src/main/java/com/baeldung/typeerasure/ArrayContentPrintUtil.java b/core-java-lang-oop/src/main/java/com/baeldung/typeerasure/ArrayContentPrintUtil.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/typeerasure/ArrayContentPrintUtil.java
rename to core-java-lang-oop/src/main/java/com/baeldung/typeerasure/ArrayContentPrintUtil.java
diff --git a/core-java-lang/src/main/java/com/baeldung/typeerasure/BoundStack.java b/core-java-lang-oop/src/main/java/com/baeldung/typeerasure/BoundStack.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/typeerasure/BoundStack.java
rename to core-java-lang-oop/src/main/java/com/baeldung/typeerasure/BoundStack.java
diff --git a/core-java-lang/src/main/java/com/baeldung/typeerasure/IntegerStack.java b/core-java-lang-oop/src/main/java/com/baeldung/typeerasure/IntegerStack.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/typeerasure/IntegerStack.java
rename to core-java-lang-oop/src/main/java/com/baeldung/typeerasure/IntegerStack.java
diff --git a/core-java-lang/src/main/java/com/baeldung/typeerasure/Stack.java b/core-java-lang-oop/src/main/java/com/baeldung/typeerasure/Stack.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/typeerasure/Stack.java
rename to core-java-lang-oop/src/main/java/com/baeldung/typeerasure/Stack.java
diff --git a/spring-mybatis/src/main/resources/logback.xml b/core-java-lang-oop/src/main/resources/logback.xml
similarity index 57%
rename from spring-mybatis/src/main/resources/logback.xml
rename to core-java-lang-oop/src/main/resources/logback.xml
index 7d900d8ea8..56af2d397e 100644
--- a/spring-mybatis/src/main/resources/logback.xml
+++ b/core-java-lang-oop/src/main/resources/logback.xml
@@ -7,6 +7,12 @@
+
+
+
+
+
+
diff --git a/core-java-lang/src/test/java/com/baeldung/casting/CastingUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/casting/CastingUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/casting/CastingUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/casting/CastingUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/constructors/ConstructorUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/deepcopy/DeepCopyUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/deepcopy/DeepCopyUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/deepcopy/DeepCopyUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/deepcopy/DeepCopyUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/deepcopy/ShallowCopyUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/deepcopy/ShallowCopyUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/deepcopy/ShallowCopyUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/deepcopy/ShallowCopyUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/equalshashcode/MoneyUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/MoneyUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/equalshashcode/MoneyUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/MoneyUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/equalshashcode/TeamUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/TeamUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/equalshashcode/TeamUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/TeamUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/equalshashcode/entities/ComplexClassUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/entities/ComplexClassUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/equalshashcode/entities/ComplexClassUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/entities/ComplexClassUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/equalshashcode/entities/PrimitiveClassUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/entities/PrimitiveClassUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/equalshashcode/entities/PrimitiveClassUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/entities/PrimitiveClassUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/equalshashcode/entities/SquareClassUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/entities/SquareClassUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/equalshashcode/entities/SquareClassUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/equalshashcode/entities/SquareClassUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/finalkeyword/FinalUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/finalkeyword/FinalUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/finalkeyword/FinalUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/finalkeyword/FinalUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/hashcode/application/ApplicationUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/hashcode/application/ApplicationUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/hashcode/application/ApplicationUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/hashcode/application/ApplicationUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/hashcode/entities/UserUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/hashcode/entities/UserUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/hashcode/entities/UserUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/hashcode/entities/UserUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/immutableobjects/ImmutableObjectsUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/immutableobjects/ImmutableObjectsUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/immutableobjects/ImmutableObjectsUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/immutableobjects/ImmutableObjectsUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/inheritance/AppUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/inheritance/AppUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/inheritance/AppUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/inheritance/AppUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/inheritancecomposition/test/ActressUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/ActressUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/inheritancecomposition/test/ActressUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/ActressUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/inheritancecomposition/test/CompositionUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/CompositionUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/inheritancecomposition/test/CompositionUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/CompositionUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/inheritancecomposition/test/InheritanceUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/InheritanceUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/inheritancecomposition/test/InheritanceUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/InheritanceUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/inheritancecomposition/test/PersonUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/PersonUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/inheritancecomposition/test/PersonUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/PersonUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/inheritancecomposition/test/WaitressUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/WaitressUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/inheritancecomposition/test/WaitressUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/inheritancecomposition/test/WaitressUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/initializationguide/UserUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/initializationguide/UserUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/initializationguide/UserUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/initializationguide/UserUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverloadingUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverloadingUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverloadingUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverloadingUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverridingUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverridingUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverridingUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/methodoverloadingoverriding/test/MethodOverridingUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/parameterpassing/NonPrimitivesUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/parameterpassing/NonPrimitivesUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/parameterpassing/NonPrimitivesUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/parameterpassing/NonPrimitivesUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/parameterpassing/PrimitivesUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/parameterpassing/PrimitivesUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/parameterpassing/PrimitivesUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/parameterpassing/PrimitivesUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/polymorphism/PolymorphismUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/polymorphism/PolymorphismUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/polymorphism/PolymorphismUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/polymorphism/PolymorphismUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/staticdemo/CarIntegrationTest.java b/core-java-lang-oop/src/test/java/com/baeldung/staticdemo/CarIntegrationTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/staticdemo/CarIntegrationTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/staticdemo/CarIntegrationTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/staticdemo/SingletonIntegrationTest.java b/core-java-lang-oop/src/test/java/com/baeldung/staticdemo/SingletonIntegrationTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/staticdemo/SingletonIntegrationTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/staticdemo/SingletonIntegrationTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/staticdemo/StaticBlockIntegrationTest.java b/core-java-lang-oop/src/test/java/com/baeldung/staticdemo/StaticBlockIntegrationTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/staticdemo/StaticBlockIntegrationTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/staticdemo/StaticBlockIntegrationTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/typeerasure/TypeErasureUnitTest.java b/core-java-lang-oop/src/test/java/com/baeldung/typeerasure/TypeErasureUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/typeerasure/TypeErasureUnitTest.java
rename to core-java-lang-oop/src/test/java/com/baeldung/typeerasure/TypeErasureUnitTest.java
diff --git a/core-java-lang-oop/src/test/resources/.gitignore b/core-java-lang-oop/src/test/resources/.gitignore
new file mode 100644
index 0000000000..83c05e60c8
--- /dev/null
+++ b/core-java-lang-oop/src/test/resources/.gitignore
@@ -0,0 +1,13 @@
+*.class
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+
+# Packaged files #
+*.jar
+*.war
+*.ear
\ No newline at end of file
diff --git a/core-java-lang-syntax/.gitignore b/core-java-lang-syntax/.gitignore
new file mode 100644
index 0000000000..374c8bf907
--- /dev/null
+++ b/core-java-lang-syntax/.gitignore
@@ -0,0 +1,25 @@
+*.class
+
+0.*
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+.resourceCache
+
+# Packaged files #
+*.jar
+*.war
+*.ear
+
+# Files generated by integration tests
+backup-pom.xml
+/bin/
+/temp
+
+#IntelliJ specific
+.idea/
+*.iml
\ No newline at end of file
diff --git a/core-java-lang-syntax/README.md b/core-java-lang-syntax/README.md
new file mode 100644
index 0000000000..a7c1b7cc4a
--- /dev/null
+++ b/core-java-lang-syntax/README.md
@@ -0,0 +1,19 @@
+=========
+
+## Core Java Lang Syntax Cookbooks and Examples
+
+### Relevant Articles:
+- [Introduction to Java Generics](http://www.baeldung.com/java-generics)
+- [Java Primitive Conversions](http://www.baeldung.com/java-primitive-conversions)
+- [Java Double Brace Initialization](http://www.baeldung.com/java-double-brace-initialization)
+- [Guide to the Diamond Operator in Java](http://www.baeldung.com/java-diamond-operator)
+- [The Java continue and break Keywords](http://www.baeldung.com/java-continue-and-break)
+- [A Guide to Java Initialization](http://www.baeldung.com/java-initialization)
+- [A Guide to Java Loops](http://www.baeldung.com/java-loops)
+- [Varargs in Java](http://www.baeldung.com/java-varargs)
+- [A Guide to Java Enums](http://www.baeldung.com/a-guide-to-java-enums)
+- [Infinite Loops in Java](http://www.baeldung.com/infinite-loops-java)
+- [Quick Guide to java.lang.System](http://www.baeldung.com/java-lang-system)
+- [Java Switch Statement](https://www.baeldung.com/java-switch)
+- [The Modulo Operator in Java](https://www.baeldung.com/modulo-java)
+- [Ternary Operator In Java](https://www.baeldung.com/java-ternary-operator)
\ No newline at end of file
diff --git a/core-java-lang-syntax/pom.xml b/core-java-lang-syntax/pom.xml
new file mode 100644
index 0000000000..9481f29459
--- /dev/null
+++ b/core-java-lang-syntax/pom.xml
@@ -0,0 +1,53 @@
+
+ 4.0.0
+ com.baeldung
+ core-java-lang-syntax
+ 0.1.0-SNAPSHOT
+ jar
+ core-java-lang-syntax
+
+
+ com.baeldung
+ parent-java
+ 0.0.1-SNAPSHOT
+ ../parent-java
+
+
+
+
+
+ log4j
+ log4j
+ ${log4j.version}
+
+
+ org.slf4j
+ log4j-over-slf4j
+ ${org.slf4j.version}
+
+
+
+ org.assertj
+ assertj-core
+ ${assertj-core.version}
+ test
+
+
+
+
+ core-java-lang-syntax
+
+
+ src/main/resources
+ true
+
+
+
+
+
+
+ 3.10.0
+
+
+
diff --git a/core-java-lang/src/main/java/com/baeldung/breakcontinue/BreakContinue.java b/core-java-lang-syntax/src/main/java/com/baeldung/breakcontinue/BreakContinue.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/breakcontinue/BreakContinue.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/breakcontinue/BreakContinue.java
diff --git a/core-java-lang/src/main/java/com/baeldung/enums/Pizza.java b/core-java-lang-syntax/src/main/java/com/baeldung/enums/Pizza.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/enums/Pizza.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/enums/Pizza.java
diff --git a/core-java-lang/src/main/java/com/baeldung/enums/PizzaDeliveryStrategy.java b/core-java-lang-syntax/src/main/java/com/baeldung/enums/PizzaDeliveryStrategy.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/enums/PizzaDeliveryStrategy.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/enums/PizzaDeliveryStrategy.java
diff --git a/core-java-lang/src/main/java/com/baeldung/enums/PizzaDeliverySystemConfiguration.java b/core-java-lang-syntax/src/main/java/com/baeldung/enums/PizzaDeliverySystemConfiguration.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/enums/PizzaDeliverySystemConfiguration.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/enums/PizzaDeliverySystemConfiguration.java
diff --git a/core-java-lang/src/main/java/com/baeldung/enums/README.md b/core-java-lang-syntax/src/main/java/com/baeldung/enums/README.md
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/enums/README.md
rename to core-java-lang-syntax/src/main/java/com/baeldung/enums/README.md
diff --git a/core-java-lang/src/main/java/com/baeldung/generics/Building.java b/core-java-lang-syntax/src/main/java/com/baeldung/generics/Building.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/generics/Building.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/generics/Building.java
diff --git a/core-java-lang/src/main/java/com/baeldung/generics/Generics.java b/core-java-lang-syntax/src/main/java/com/baeldung/generics/Generics.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/generics/Generics.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/generics/Generics.java
diff --git a/core-java-lang/src/main/java/com/baeldung/generics/House.java b/core-java-lang-syntax/src/main/java/com/baeldung/generics/House.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/generics/House.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/generics/House.java
diff --git a/core-java-lang-syntax/src/main/java/com/baeldung/initializationguide/User.java b/core-java-lang-syntax/src/main/java/com/baeldung/initializationguide/User.java
new file mode 100644
index 0000000000..e2e3f051dd
--- /dev/null
+++ b/core-java-lang-syntax/src/main/java/com/baeldung/initializationguide/User.java
@@ -0,0 +1,53 @@
+package com.baeldung.initializationguide;
+
+import java.io.Serializable;
+
+public class User implements Serializable, Cloneable {
+ private static final long serialVersionUID = 1L;
+ static String forum;
+ private String name;
+ private int id;
+
+ {
+ id = 0;
+ System.out.println("Instance Initializer");
+ }
+
+ static {
+ forum = "Java";
+ System.out.println("Static Initializer");
+ }
+
+ public User(String name, int id) {
+ super();
+ this.name = name;
+ this.id = id;
+ }
+
+ public User() {
+ System.out.println("Constructor");
+ }
+
+ public String getName() {
+ return name;
+ }
+
+ public void setName(String name) {
+ this.name = name;
+ }
+
+ public int getId() {
+ return id;
+ }
+
+ public void setId(int id) {
+ this.id = id;
+ }
+
+ @Override
+ protected Object clone() throws CloneNotSupportedException {
+ return this;
+ }
+
+}
+
diff --git a/core-java-lang/src/main/java/com/baeldung/loops/InfiniteLoops.java b/core-java-lang-syntax/src/main/java/com/baeldung/loops/InfiniteLoops.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/loops/InfiniteLoops.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/loops/InfiniteLoops.java
diff --git a/core-java-lang/src/main/java/com/baeldung/loops/LoopsInJava.java b/core-java-lang-syntax/src/main/java/com/baeldung/loops/LoopsInJava.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/loops/LoopsInJava.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/loops/LoopsInJava.java
diff --git a/core-java-lang/src/main/java/com/baeldung/switchstatement/SwitchStatement.java b/core-java-lang-syntax/src/main/java/com/baeldung/switchstatement/SwitchStatement.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/switchstatement/SwitchStatement.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/switchstatement/SwitchStatement.java
diff --git a/core-java-lang/src/main/java/com/baeldung/system/ChatWindow.java b/core-java-lang-syntax/src/main/java/com/baeldung/system/ChatWindow.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/system/ChatWindow.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/system/ChatWindow.java
diff --git a/core-java-lang/src/main/java/com/baeldung/system/DateTimeService.java b/core-java-lang-syntax/src/main/java/com/baeldung/system/DateTimeService.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/system/DateTimeService.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/system/DateTimeService.java
diff --git a/core-java-lang/src/main/java/com/baeldung/system/EnvironmentVariables.java b/core-java-lang-syntax/src/main/java/com/baeldung/system/EnvironmentVariables.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/system/EnvironmentVariables.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/system/EnvironmentVariables.java
diff --git a/core-java-lang/src/main/java/com/baeldung/system/SystemErrDemo.java b/core-java-lang-syntax/src/main/java/com/baeldung/system/SystemErrDemo.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/system/SystemErrDemo.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/system/SystemErrDemo.java
diff --git a/core-java-lang/src/main/java/com/baeldung/system/SystemExitDemo.java b/core-java-lang-syntax/src/main/java/com/baeldung/system/SystemExitDemo.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/system/SystemExitDemo.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/system/SystemExitDemo.java
diff --git a/core-java-lang/src/main/java/com/baeldung/system/SystemOutDemo.java b/core-java-lang-syntax/src/main/java/com/baeldung/system/SystemOutDemo.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/system/SystemOutDemo.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/system/SystemOutDemo.java
diff --git a/core-java-lang/src/main/java/com/baeldung/system/UserCredentials.java b/core-java-lang-syntax/src/main/java/com/baeldung/system/UserCredentials.java
similarity index 100%
rename from core-java-lang/src/main/java/com/baeldung/system/UserCredentials.java
rename to core-java-lang-syntax/src/main/java/com/baeldung/system/UserCredentials.java
diff --git a/core-java-lang/src/test/java/com/baeldung/breakcontinue/BreakContinueUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/breakcontinue/BreakContinueUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/breakcontinue/BreakContinueUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/breakcontinue/BreakContinueUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/enums/PizzaUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/enums/PizzaUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/enums/PizzaUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/enums/PizzaUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/generics/GenericsUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/generics/GenericsUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/generics/GenericsUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/generics/GenericsUnitTest.java
diff --git a/core-java-lang-syntax/src/test/java/com/baeldung/initializationguide/UserUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/initializationguide/UserUnitTest.java
new file mode 100644
index 0000000000..f74384e6f7
--- /dev/null
+++ b/core-java-lang-syntax/src/test/java/com/baeldung/initializationguide/UserUnitTest.java
@@ -0,0 +1,37 @@
+package com.baeldung.initializationguide;
+import org.junit.Before;
+import org.junit.Test;
+
+import static org.assertj.core.api.Assertions.*;
+
+import java.lang.reflect.InvocationTargetException;
+
+public class UserUnitTest {
+
+ @Test
+ public void givenUserInstance_whenIntializedWithNew_thenInstanceIsNotNull() {
+ User user = new User("Alice", 1);
+ assertThat(user).isNotNull();
+ }
+
+ @Test
+ public void givenUserInstance_whenInitializedWithReflection_thenInstanceIsNotNull() throws InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException, SecurityException {
+ User user = User.class.getConstructor(String.class, int.class)
+ .newInstance("Alice", 2);
+ assertThat(user).isNotNull();
+ }
+
+ @Test
+ public void givenUserInstance_whenCopiedWithClone_thenExactMatchIsCreated() throws CloneNotSupportedException {
+ User user = new User("Alice", 3);
+ User clonedUser = (User) user.clone();
+ assertThat(clonedUser).isEqualTo(user);
+ }
+
+ @Test
+ public void givenUserInstance_whenValuesAreNotInitialized_thenUserNameAndIdReturnDefault() {
+ User user = new User();
+ assertThat(user.getName()).isNull();
+ assertThat(user.getId() == 0);
+ }
+}
diff --git a/core-java-lang/src/test/java/com/baeldung/java/diamond/Car.java b/core-java-lang-syntax/src/test/java/com/baeldung/java/diamond/Car.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/java/diamond/Car.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/java/diamond/Car.java
diff --git a/core-java-lang/src/test/java/com/baeldung/java/diamond/DiamondOperatorUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/java/diamond/DiamondOperatorUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/java/diamond/DiamondOperatorUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/java/diamond/DiamondOperatorUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/java/diamond/Diesel.java b/core-java-lang-syntax/src/test/java/com/baeldung/java/diamond/Diesel.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/java/diamond/Diesel.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/java/diamond/Diesel.java
diff --git a/core-java-lang/src/test/java/com/baeldung/java/diamond/Engine.java b/core-java-lang-syntax/src/test/java/com/baeldung/java/diamond/Engine.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/java/diamond/Engine.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/java/diamond/Engine.java
diff --git a/core-java-lang/src/test/java/com/baeldung/java/diamond/Vehicle.java b/core-java-lang-syntax/src/test/java/com/baeldung/java/diamond/Vehicle.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/java/diamond/Vehicle.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/java/diamond/Vehicle.java
diff --git a/core-java-lang/src/test/java/com/baeldung/java/doublebrace/DoubleBraceUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/java/doublebrace/DoubleBraceUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/java/doublebrace/DoubleBraceUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/java/doublebrace/DoubleBraceUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/loops/WhenUsingLoops.java b/core-java-lang-syntax/src/test/java/com/baeldung/loops/WhenUsingLoops.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/loops/WhenUsingLoops.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/loops/WhenUsingLoops.java
diff --git a/core-java-lang/src/test/java/com/baeldung/modulo/ModuloUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/modulo/ModuloUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/modulo/ModuloUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/modulo/ModuloUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/primitiveconversion/PrimitiveConversionsJUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/primitiveconversion/PrimitiveConversionsJUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/primitiveconversion/PrimitiveConversionsJUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/primitiveconversion/PrimitiveConversionsJUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/switchstatement/SwitchStatementUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/switchstatement/SwitchStatementUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/switchstatement/SwitchStatementUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/switchstatement/SwitchStatementUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/system/DateTimeServiceUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/system/DateTimeServiceUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/system/DateTimeServiceUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/system/DateTimeServiceUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/system/EnvironmentVariablesUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/system/EnvironmentVariablesUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/system/EnvironmentVariablesUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/system/EnvironmentVariablesUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/system/SystemArrayCopyUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/system/SystemArrayCopyUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/system/SystemArrayCopyUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/system/SystemArrayCopyUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/system/SystemNanoUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/system/SystemNanoUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/system/SystemNanoUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/system/SystemNanoUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/system/SystemPropertiesUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/system/SystemPropertiesUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/system/SystemPropertiesUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/system/SystemPropertiesUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/ternaryoperator/TernaryOperatorUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/ternaryoperator/TernaryOperatorUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/ternaryoperator/TernaryOperatorUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/ternaryoperator/TernaryOperatorUnitTest.java
diff --git a/core-java-lang/src/test/java/com/baeldung/varargs/FormatterUnitTest.java b/core-java-lang-syntax/src/test/java/com/baeldung/varargs/FormatterUnitTest.java
similarity index 100%
rename from core-java-lang/src/test/java/com/baeldung/varargs/FormatterUnitTest.java
rename to core-java-lang-syntax/src/test/java/com/baeldung/varargs/FormatterUnitTest.java
diff --git a/core-java-lang/README.md b/core-java-lang/README.md
index 69209bb193..52dfe708a3 100644
--- a/core-java-lang/README.md
+++ b/core-java-lang/README.md
@@ -4,44 +4,24 @@
### Relevant Articles:
- [Guide to Java Reflection](http://www.baeldung.com/java-reflection)
-- [Introduction to Java Generics](http://www.baeldung.com/java-generics)
- [Generate equals() and hashCode() with Eclipse](http://www.baeldung.com/java-eclipse-equals-and-hashcode)
- [Chained Exceptions in Java](http://www.baeldung.com/java-chained-exceptions)
-- [Java Primitive Conversions](http://www.baeldung.com/java-primitive-conversions)
- [Call Methods at Runtime Using Java Reflection](http://www.baeldung.com/java-method-reflection)
- [Iterating Over Enum Values in Java](http://www.baeldung.com/java-enum-iteration)
- [Changing Annotation Parameters At Runtime](http://www.baeldung.com/java-reflection-change-annotation-params)
- [Dynamic Proxies in Java](http://www.baeldung.com/java-dynamic-proxies)
- [Java Double Brace Initialization](http://www.baeldung.com/java-double-brace-initialization)
-- [Guide to hashCode() in Java](http://www.baeldung.com/java-hashcode)
- [Guide to the Diamond Operator in Java](http://www.baeldung.com/java-diamond-operator)
-- [A Guide to the Static Keyword in Java](http://www.baeldung.com/java-static)
- [Quick Example - Comparator vs Comparable in Java](http://www.baeldung.com/java-comparator-comparable)
- [The Java continue and break Keywords](http://www.baeldung.com/java-continue-and-break)
-- [A Guide to Java Initialization](http://www.baeldung.com/java-initialization)
- [Nested Classes in Java](http://www.baeldung.com/java-nested-classes)
-- [A Guide to Java Loops](http://www.baeldung.com/java-loops)
-- [Varargs in Java](http://www.baeldung.com/java-varargs)
- [A Guide to Inner Interfaces in Java](http://www.baeldung.com/java-inner-interfaces)
-- [Polymorphism in Java](http://www.baeldung.com/java-polymorphism)
- [Recursion In Java](http://www.baeldung.com/java-recursion)
- [A Guide to the finalize Method in Java](http://www.baeldung.com/java-finalize)
-- [Method Overloading and Overriding in Java](http://www.baeldung.com/java-method-overload-override)
-- [How to Make a Deep Copy of an Object in Java](http://www.baeldung.com/java-deep-copy)
-- [Guide to Inheritance in Java](http://www.baeldung.com/java-inheritance)
-- [Object Type Casting in Java](http://www.baeldung.com/java-type-casting)
-- [The "final" Keyword in Java](http://www.baeldung.com/java-final)
- [A Guide to Java Enums](http://www.baeldung.com/a-guide-to-java-enums)
- [Infinite Loops in Java](http://www.baeldung.com/infinite-loops-java)
- [Quick Guide to java.lang.System](http://www.baeldung.com/java-lang-system)
-- [Type Erasure in Java Explained](http://www.baeldung.com/java-type-erasure)
- [Using Java Assertions](http://www.baeldung.com/java-assert)
-- [Pass-By-Value as a Parameter Passing Mechanism in Java](http://www.baeldung.com/java-pass-by-value-or-pass-by-reference)
-- [Variable and Method Hiding in Java](http://www.baeldung.com/java-variable-method-hiding)
-- [Access Modifiers in Java](http://www.baeldung.com/java-access-modifiers)
-- [Guide to the super Java Keyword](http://www.baeldung.com/java-super)
-- [Guide to the this Java Keyword](http://www.baeldung.com/java-this)
-- [Immutable Objects in Java](http://www.baeldung.com/java-immutable-object)
- [ClassNotFoundException vs NoClassDefFoundError](http://www.baeldung.com/java-classnotfoundexception-and-noclassdeffounderror)
- [The StackOverflowError in Java](http://www.baeldung.com/java-stack-overflow-error)
- [Create a Custom Exception in Java](http://www.baeldung.com/java-new-custom-exception)
@@ -50,12 +30,6 @@
- [Static and Dynamic Binding in Java](https://www.baeldung.com/java-static-dynamic-binding)
- [Difference Between Throw and Throws in Java](https://www.baeldung.com/java-throw-throws)
- [Synthetic Constructs in Java](https://www.baeldung.com/java-synthetic)
-- [Java Switch Statement](https://www.baeldung.com/java-switch)
-- [The Modulo Operator in Java](https://www.baeldung.com/modulo-java)
-- [Ternary Operator In Java](https://www.baeldung.com/java-ternary-operator)
- [How to Separate Double into Integer and Decimal Parts](https://www.baeldung.com/java-separate-double-into-integer-decimal-parts)
- [“Sneaky Throws” in Java](http://www.baeldung.com/java-sneaky-throws)
-- [Inheritance and Composition (Is-a vs Has-a relationship) in Java](http://www.baeldung.com/java-inheritance-composition)
-- [A Guide to Constructors in Java](https://www.baeldung.com/java-constructors)
- [Retrieving a Class Name in Java](https://www.baeldung.com/java-class-name)
-- [Java equals() and hashCode() Contracts](https://www.baeldung.com/java-equals-hashcode-contracts)
diff --git a/core-java-lang/pom.xml b/core-java-lang/pom.xml
index 2f307859f1..283acab775 100644
--- a/core-java-lang/pom.xml
+++ b/core-java-lang/pom.xml
@@ -56,22 +56,11 @@
${assertj-core.version}test
-
- org.springframework
- spring-web
- ${springframework.spring-web.version}
- javax.mailmail${javax.mail.version}
-
- nl.jqno.equalsverifier
- equalsverifier
- ${equalsverifier.version}
- test
-
@@ -82,334 +71,12 @@
true
-
-
-
- org.apache.maven.plugins
- maven-surefire-plugin
-
-
- **/*LiveTest.java
- **/*IntegrationTest.java
- **/*IntTest.java
- **/*LongRunningUnitTest.java
- **/*ManualTest.java
-
- true
-
-
-
-
- org.apache.maven.plugins
- maven-dependency-plugin
-
-
- copy-dependencies
- prepare-package
-
- copy-dependencies
-
-
- ${project.build.directory}/libs
-
-
-
-
-
-
- org.apache.maven.plugins
- maven-jar-plugin
- ${maven-jar-plugin.version}
-
-
-
- true
- libs/
- org.baeldung.executable.ExecutableMavenJar
-
-
-
-
-
-
- org.apache.maven.plugins
- maven-assembly-plugin
-
-
- package
-
- single
-
-
- ${project.basedir}
-
-
- org.baeldung.executable.ExecutableMavenJar
-
-
-
- jar-with-dependencies
-
-
-
-
-
-
-
- org.apache.maven.plugins
- maven-shade-plugin
- ${maven-shade-plugin.version}
-
-
-
- shade
-
-
- true
-
-
- org.baeldung.executable.ExecutableMavenJar
-
-
-
-
-
-
-
-
- com.jolira
- onejar-maven-plugin
- ${onejar-maven-plugin.version}
-
-
-
- org.baeldung.executable.ExecutableMavenJar
- true
- ${project.build.finalName}-onejar.${project.packaging}
-
-
- one-jar
-
-
-
-
-
-
- org.springframework.boot
- spring-boot-maven-plugin
- ${spring-boot-maven-plugin.version}
-
-
-
- repackage
-
-
- spring-boot
- org.baeldung.executable.ExecutableMavenJar
-
-
-
-
-
-
- org.codehaus.mojo
- exec-maven-plugin
- ${exec-maven-plugin.version}
-
- java
- com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed
-
- -Xmx300m
- -XX:+UseParallelGC
- -classpath
-
- com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed
-
-
-
-
-
- org.apache.maven.plugins
- maven-javadoc-plugin
- ${maven-javadoc-plugin.version}
-
-
- 1.8
-
-
-
-
-
- integration
-
-
-
- org.apache.maven.plugins
- maven-surefire-plugin
-
-
- integration-test
-
- test
-
-
-
- **/*ManualTest.java
-
-
- **/*IntegrationTest.java
- **/*IntTest.java
-
-
-
-
-
-
- json
-
-
-
-
- org.codehaus.mojo
- exec-maven-plugin
- ${exec-maven-plugin.version}
-
-
- run-benchmarks
-
- none
-
- exec
-
-
- test
- java
-
- -classpath
-
- org.openjdk.jmh.Main
- .*
-
-
-
-
-
-
-
-
-
-
-
- buildAgentLoader
-
-
-
- org.apache.maven.plugins
- maven-jar-plugin
-
-
- package
-
- jar
-
-
- agentLoader
- target/classes
-
-
- true
-
- ${project.build.outputDirectory}/META-INF/MANIFEST.MF
-
-
-
- com/baeldung/instrumentation/application/AgentLoader.class
- com/baeldung/instrumentation/application/Launcher.class
-
-
-
-
-
-
-
-
-
- buildApplication
-
-
-
- org.apache.maven.plugins
- maven-jar-plugin
-
-
- package
-
- jar
-
-
- application
- target/classes
-
-
- true
-
- ${project.build.outputDirectory}/META-INF/MANIFEST.MF
-
-
-
- com/baeldung/instrumentation/application/MyAtm.class
- com/baeldung/instrumentation/application/MyAtmApplication.class
- com/baeldung/instrumentation/application/Launcher.class
-
-
-
-
-
-
-
-
-
- buildAgent
-
-
-
- org.apache.maven.plugins
- maven-jar-plugin
-
-
- package
-
- jar
-
-
- agent
- target/classes
-
-
- true
-
- ${project.build.outputDirectory}/META-INF/MANIFEST.MF
-
-
-
- com/baeldung/instrumentation/agent/AtmTransformer.class
- com/baeldung/instrumentation/agent/MyInstrumentationAgent.class
-
-
-
-
-
-
-
-
-
-
- 2.8.5
+ 2.9.72.8.2
@@ -420,17 +87,6 @@
3.10.0
-
-
- 2.21.0
- 4.3.4.RELEASE
- 3.0.0-M1
- 3.0.2
- 1.4.4
- 3.1.1
- 2.0.3.RELEASE
- 1.6.0
- 3.0.3
diff --git a/core-java-lang/src/main/java/com/baeldung/controlstructures/ConditionalBranches.java b/core-java-lang/src/main/java/com/baeldung/controlstructures/ConditionalBranches.java
new file mode 100644
index 0000000000..bace609699
--- /dev/null
+++ b/core-java-lang/src/main/java/com/baeldung/controlstructures/ConditionalBranches.java
@@ -0,0 +1,68 @@
+package com.baeldung.controlstructures;
+
+public class ConditionalBranches {
+
+ /**
+ * Multiple if/else/else if statements examples. Shows different syntax usage.
+ */
+ public static void ifElseStatementsExamples() {
+ int count = 2; // Initial count value.
+
+ // Basic syntax. Only one statement follows. No brace usage.
+ if (count > 1)
+ System.out.println("Count is higher than 1");
+
+ // Basic syntax. More than one statement can be included. Braces are used (recommended syntax).
+ if (count > 1) {
+ System.out.println("Count is higher than 1");
+ System.out.println("Count is equal to: " + count);
+ }
+
+ // If/Else syntax. Two different courses of action can be included.
+ if (count > 2) {
+ System.out.println("Count is higher than 2");
+ } else {
+ System.out.println("Count is lower or equal than 2");
+ }
+
+ // If/Else/Else If syntax. Three or more courses of action can be included.
+ if (count > 2) {
+ System.out.println("Count is higher than 2");
+ } else if (count <= 0) {
+ System.out.println("Count is less or equal than zero");
+ } else {
+ System.out.println("Count is either equal to one, or two");
+ }
+ }
+
+ /**
+ * Ternary Operator example.
+ * @see ConditionalBranches#ifElseStatementsExamples()
+ */
+ public static void ternaryExample() {
+ int count = 2;
+ System.out.println(count > 2 ? "Count is higher than 2" : "Count is lower or equal than 2");
+ }
+
+ /**
+ * Switch structure example. Shows how to replace multiple if/else statements with one structure.
+ */
+ public static void switchExample() {
+ int count = 3;
+ switch (count) {
+ case 0:
+ System.out.println("Count is equal to 0");
+ break;
+ case 1:
+ System.out.println("Count is equal to 1");
+ break;
+ case 2:
+ System.out.println("Count is equal to 2");
+ break;
+ default:
+ System.out.println("Count is either negative, or higher than 2");
+ break;
+ }
+ }
+
+}
diff --git a/core-java-lang/src/main/java/com/baeldung/controlstructures/Loops.java b/core-java-lang/src/main/java/com/baeldung/controlstructures/Loops.java
new file mode 100644
index 0000000000..bc4515bfc7
--- /dev/null
+++ b/core-java-lang/src/main/java/com/baeldung/controlstructures/Loops.java
@@ -0,0 +1,157 @@
+package com.baeldung.controlstructures;
+
+public class Loops {
+
+ /**
+ * Dummy method. Only prints a generic message.
+ */
+ private static void methodToRepeat() {
+ System.out.println("Dummy method.");
+ }
+
+ /**
+ * Shows how to iterate 50 times with 3 different method/control structures.
+ */
+ public static void repetitionTo50Examples() {
+ for (int i = 1; i <= 50; i++) {
+ methodToRepeat();
+ }
+
+ int whileCounter = 1;
+ while (whileCounter <= 50) {
+ methodToRepeat();
+ whileCounter++;
+ }
+
+ int count = 1;
+ do {
+ methodToRepeat();
+ count++;
+ } while (count < 50);
+ }
+
+ /**
+ * Splits a sentence in words, and prints each word in a new line.
+ * @param sentence Sentence to print as independent words.
+ */
+ public static void printWordByWord(String sentence) {
+ for (String word : sentence.split(" ")) {
+ System.out.println(word);
+ }
+ }
+
+ /**
+ * Prints text an N amount of times. Shows usage of the {@code break} branching statement.
+ * @param textToPrint Text to repeatedly print.
+ * @param times Amount to times to print received text.
+ */
+ public static void printTextNTimes(String textToPrint, int times) {
+ int counter = 1;
+ while (true) {
+ System.out.println(textToPrint);
+ if (counter == times) {
+ break;
+ }
+ }
+ }
+
+ /**
+ * Prints text an N amount of times, up to 50. Shows usage of the {@code break} branching statement.
+ * @param textToPrint Text to repeatedly print.
+ * @param times Amount to times to print received text. If times is higher than 50, textToPrint will only be printed 50 times.
+ */
+ public static void printTextNTimesUpTo50(String textToPrint, int times) {
+ int counter = 1;
+ while (counter < 50) {
+ System.out.println(textToPrint);
+ if (counter == times) {
+ break;
+ }
+ }
+ }
+
+ /**
+ * Finds the index of {@code name} in a list
+ * @param name The name to look for
+ * @param names The list of names
+ * @return The index where the name was found or -1 otherwise
+ */
+ public static int findFirstInstanceOfName(String name, String[] names) {
+ int index = 0;
+ for ( ; index < names.length; index++) {
+ if (names[index].equals(name)) {
+ break;
+ }
+ }
+ return index == names.length ? -1 : index;
+ }
+
+ /**
+ * Takes several names and makes a list, skipping the specified {@code name}.
+ *
+ * @param name The name to skip
+ * @param names The list of names
+ * @return The list of names as a single string, missing the specified {@code name}.
+ */
+ public static String makeListSkippingName(String name, String[] names) {
+ String list = "";
+ for (int i = 0; i < names.length; i++) {
+ if (names[i].equals(name)) {
+ continue;
+ }
+ list += names[i];
+ }
+ return list;
+ }
+
+ /**
+ * Prints an specified amount of even numbers. Shows usage of both {@code break} and {@code continue} branching statements.
+ * @param amountToPrint Amount of even numbers to print.
+ */
+ public static void printEvenNumbers(int amountToPrint) {
+ if (amountToPrint <= 0) { // Invalid input
+ return;
+ }
+ int iterator = 0;
+ int amountPrinted = 0;
+ while (true) {
+ if (iterator % 2 == 0) { // Is an even number
+ System.out.println(iterator);
+ amountPrinted++;
+ iterator++;
+ } else {
+ iterator++;
+ continue; // Won't print
+ }
+ if (amountPrinted == amountToPrint) {
+ break;
+ }
+ }
+ }
+
+ /**
+ * Prints an specified amount of even numbers, up to 100. Shows usage of both {@code break} and {@code continue} branching statements.
+ * @param amountToPrint Amount of even numbers to print.
+ */
+ public static void printEvenNumbersToAMaxOf100(int amountToPrint) {
+ if (amountToPrint <= 0) { // Invalid input
+ return;
+ }
+ int iterator = 0;
+ int amountPrinted = 0;
+ while (amountPrinted < 100) {
+ if (iterator % 2 == 0) { // Is an even number
+ System.out.println(iterator);
+ amountPrinted++;
+ iterator++;
+ } else {
+ iterator++;
+ continue; // Won't print
+ }
+ if (amountPrinted == amountToPrint) {
+ break;
+ }
+ }
+ }
+
+}
diff --git a/core-java-lang/src/main/java/com/baeldung/packages/TodoApp.java b/core-java-lang/src/main/java/com/baeldung/packages/TodoApp.java
new file mode 100644
index 0000000000..0f4a56f708
--- /dev/null
+++ b/core-java-lang/src/main/java/com/baeldung/packages/TodoApp.java
@@ -0,0 +1,22 @@
+package com.baeldung.packages;
+
+import java.time.LocalDate;
+
+import com.baeldung.packages.domain.TodoItem;
+
+public class TodoApp {
+
+ public static void main(String[] args) {
+ TodoList todoList = new TodoList();
+ for (int i = 0; i < 3; i++) {
+ TodoItem item = new TodoItem();
+ item.setId(Long.valueOf((long)i));
+ item.setDescription("Todo item " + (i + 1));
+ item.setDueDate(LocalDate.now().plusDays((long)(i + 1)));
+ todoList.addTodoItem(item);
+ }
+
+ todoList.getTodoItems().forEach((TodoItem todoItem) -> System.out.println(todoItem.toString()));
+ }
+
+}
diff --git a/core-java-lang/src/main/java/com/baeldung/packages/TodoList.java b/core-java-lang/src/main/java/com/baeldung/packages/TodoList.java
new file mode 100644
index 0000000000..6ed6cd4ec1
--- /dev/null
+++ b/core-java-lang/src/main/java/com/baeldung/packages/TodoList.java
@@ -0,0 +1,27 @@
+package com.baeldung.packages;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import com.baeldung.packages.domain.TodoItem;
+
+public class TodoList {
+ private List todoItems;
+
+ public void addTodoItem(TodoItem todoItem) {
+ if (todoItems == null) {
+ todoItems = new ArrayList();
+ }
+
+ todoItems.add(todoItem);
+ }
+
+ public List getTodoItems() {
+ return todoItems;
+ }
+
+ public void setTodoItems(List todoItems) {
+ this.todoItems = todoItems;
+ }
+
+}
diff --git a/core-java-lang/src/main/java/com/baeldung/packages/domain/TodoItem.java b/core-java-lang/src/main/java/com/baeldung/packages/domain/TodoItem.java
new file mode 100644
index 0000000000..972e574a7f
--- /dev/null
+++ b/core-java-lang/src/main/java/com/baeldung/packages/domain/TodoItem.java
@@ -0,0 +1,39 @@
+package com.baeldung.packages.domain;
+
+import java.time.LocalDate;
+
+public class TodoItem {
+ private Long id;
+ private String description;
+ private LocalDate dueDate;
+
+ public Long getId() {
+ return id;
+ }
+
+ public void setId(Long id) {
+ this.id = id;
+ }
+
+ public String getDescription() {
+ return description;
+ }
+
+ public void setDescription(String description) {
+ this.description = description;
+ }
+
+ public LocalDate getDueDate() {
+ return dueDate;
+ }
+
+ public void setDueDate(LocalDate dueDate) {
+ this.dueDate = dueDate;
+ }
+
+ @Override
+ public String toString() {
+ return "TodoItem [id=" + id + ", description=" + description + ", dueDate=" + dueDate + "]";
+ }
+
+}
diff --git a/core-java-lang/src/test/java/com/baeldung/packages/PackagesUnitTest.java b/core-java-lang/src/test/java/com/baeldung/packages/PackagesUnitTest.java
new file mode 100644
index 0000000000..212fb7b3c7
--- /dev/null
+++ b/core-java-lang/src/test/java/com/baeldung/packages/PackagesUnitTest.java
@@ -0,0 +1,23 @@
+package com.baeldung.packages;
+
+import static org.junit.Assert.assertEquals;
+
+import java.time.LocalDate;
+
+import org.junit.Test;
+
+import com.baeldung.packages.domain.TodoItem;
+
+public class PackagesUnitTest {
+
+ @Test
+ public void whenTodoItemAdded_ThenSizeIncreases() {
+ TodoItem todoItem = new TodoItem();
+ todoItem.setId(1L);
+ todoItem.setDescription("Test the Todo List");
+ todoItem.setDueDate(LocalDate.now());
+ TodoList todoList = new TodoList();
+ todoList.addTodoItem(todoItem);
+ assertEquals(1, todoList.getTodoItems().size());
+ }
+}
diff --git a/core-java-networking/README.md b/core-java-networking/README.md
index 626ea794e6..4b77aa3c1f 100644
--- a/core-java-networking/README.md
+++ b/core-java-networking/README.md
@@ -5,3 +5,9 @@
### Relevant Articles
- [Connecting Through Proxy Servers in Core Java](https://www.baeldung.com/java-connect-via-proxy-server)
+- [Broadcasting and Multicasting in Java](http://www.baeldung.com/java-broadcast-multicast)
+- [A Guide To UDP In Java](http://www.baeldung.com/udp-in-java)
+- [Sending Emails with Java](http://www.baeldung.com/java-email)
+- [A Guide To HTTP Cookies In Java](http://www.baeldung.com/cookies-java)
+- [A Guide to the Java URL](http://www.baeldung.com/java-url)
+- [Working with Network Interfaces in Java](http://www.baeldung.com/java-network-interfaces)
diff --git a/core-java-networking/pom.xml b/core-java-networking/pom.xml
index 178295e1ec..c7fa2af180 100644
--- a/core-java-networking/pom.xml
+++ b/core-java-networking/pom.xml
@@ -13,7 +13,25 @@
../parent-java
+
+
+ javax.mail
+ mail
+ ${javax.mail.version}
+
+
+ commons-io
+ commons-io
+ ${commons-io.version}
+
+
+
core-java-networking
+
+
+ 1.5.0-b01
+ 2.5
+
diff --git a/core-java/src/main/java/com/baeldung/mail/EmailService.java b/core-java-networking/src/main/java/com/baeldung/mail/EmailService.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/mail/EmailService.java
rename to core-java-networking/src/main/java/com/baeldung/mail/EmailService.java
diff --git a/core-java/src/main/java/com/baeldung/networking/cookies/PersistentCookieStore.java b/core-java-networking/src/main/java/com/baeldung/networking/cookies/PersistentCookieStore.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/networking/cookies/PersistentCookieStore.java
rename to core-java-networking/src/main/java/com/baeldung/networking/cookies/PersistentCookieStore.java
diff --git a/core-java/src/main/java/com/baeldung/networking/cookies/ProxyAcceptCookiePolicy.java b/core-java-networking/src/main/java/com/baeldung/networking/cookies/ProxyAcceptCookiePolicy.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/networking/cookies/ProxyAcceptCookiePolicy.java
rename to core-java-networking/src/main/java/com/baeldung/networking/cookies/ProxyAcceptCookiePolicy.java
diff --git a/core-java/src/main/java/com/baeldung/networking/udp/EchoClient.java b/core-java-networking/src/main/java/com/baeldung/networking/udp/EchoClient.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/networking/udp/EchoClient.java
rename to core-java-networking/src/main/java/com/baeldung/networking/udp/EchoClient.java
diff --git a/core-java/src/main/java/com/baeldung/networking/udp/EchoServer.java b/core-java-networking/src/main/java/com/baeldung/networking/udp/EchoServer.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/networking/udp/EchoServer.java
rename to core-java-networking/src/main/java/com/baeldung/networking/udp/EchoServer.java
diff --git a/core-java/src/main/java/com/baeldung/networking/udp/broadcast/BroadcastingClient.java b/core-java-networking/src/main/java/com/baeldung/networking/udp/broadcast/BroadcastingClient.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/networking/udp/broadcast/BroadcastingClient.java
rename to core-java-networking/src/main/java/com/baeldung/networking/udp/broadcast/BroadcastingClient.java
diff --git a/core-java/src/main/java/com/baeldung/networking/udp/broadcast/BroadcastingEchoServer.java b/core-java-networking/src/main/java/com/baeldung/networking/udp/broadcast/BroadcastingEchoServer.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/networking/udp/broadcast/BroadcastingEchoServer.java
rename to core-java-networking/src/main/java/com/baeldung/networking/udp/broadcast/BroadcastingEchoServer.java
diff --git a/core-java/src/main/java/com/baeldung/networking/udp/multicast/MulticastEchoServer.java b/core-java-networking/src/main/java/com/baeldung/networking/udp/multicast/MulticastEchoServer.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/networking/udp/multicast/MulticastEchoServer.java
rename to core-java-networking/src/main/java/com/baeldung/networking/udp/multicast/MulticastEchoServer.java
diff --git a/core-java/src/main/java/com/baeldung/networking/udp/multicast/MulticastingClient.java b/core-java-networking/src/main/java/com/baeldung/networking/udp/multicast/MulticastingClient.java
similarity index 100%
rename from core-java/src/main/java/com/baeldung/networking/udp/multicast/MulticastingClient.java
rename to core-java-networking/src/main/java/com/baeldung/networking/udp/multicast/MulticastingClient.java
diff --git a/core-java/src/main/java/com/baeldung/javanetworking/uriurl/URIDemo.java b/core-java-networking/src/main/java/com/baeldung/networking/uriurl/URIDemo.java
similarity index 98%
rename from core-java/src/main/java/com/baeldung/javanetworking/uriurl/URIDemo.java
rename to core-java-networking/src/main/java/com/baeldung/networking/uriurl/URIDemo.java
index 121e0f5d72..91f6e21293 100644
--- a/core-java/src/main/java/com/baeldung/javanetworking/uriurl/URIDemo.java
+++ b/core-java-networking/src/main/java/com/baeldung/networking/uriurl/URIDemo.java
@@ -1,4 +1,4 @@
-package com.baeldung.javanetworking.uriurl;
+package com.baeldung.networking.uriurl;
import java.io.BufferedReader;
import java.io.IOException;
diff --git a/core-java/src/main/java/com/baeldung/javanetworking/uriurl/URLDemo.java b/core-java-networking/src/main/java/com/baeldung/networking/uriurl/URLDemo.java
similarity index 98%
rename from core-java/src/main/java/com/baeldung/javanetworking/uriurl/URLDemo.java
rename to core-java-networking/src/main/java/com/baeldung/networking/uriurl/URLDemo.java
index 109a9951d2..d257e7a295 100644
--- a/core-java/src/main/java/com/baeldung/javanetworking/uriurl/URLDemo.java
+++ b/core-java-networking/src/main/java/com/baeldung/networking/uriurl/URLDemo.java
@@ -1,4 +1,4 @@
-package com.baeldung.javanetworking.uriurl;
+package com.baeldung.networking.uriurl;
import java.io.BufferedReader;
import java.io.IOException;
diff --git a/spring-rest-template/src/main/resources/logback.xml b/core-java-networking/src/main/resources/logback.xml
similarity index 57%
rename from spring-rest-template/src/main/resources/logback.xml
rename to core-java-networking/src/main/resources/logback.xml
index 7d900d8ea8..56af2d397e 100644
--- a/spring-rest-template/src/main/resources/logback.xml
+++ b/core-java-networking/src/main/resources/logback.xml
@@ -7,6 +7,12 @@
+
+
+
+
+
+
diff --git a/core-java/src/test/java/com/baeldung/java/networking/interfaces/NetworkInterfaceManualTest.java b/core-java-networking/src/test/java/com/baeldung/networking/interfaces/NetworkInterfaceManualTest.java
similarity index 98%
rename from core-java/src/test/java/com/baeldung/java/networking/interfaces/NetworkInterfaceManualTest.java
rename to core-java-networking/src/test/java/com/baeldung/networking/interfaces/NetworkInterfaceManualTest.java
index 8635a24f18..47a598f599 100644
--- a/core-java/src/test/java/com/baeldung/java/networking/interfaces/NetworkInterfaceManualTest.java
+++ b/core-java-networking/src/test/java/com/baeldung/networking/interfaces/NetworkInterfaceManualTest.java
@@ -1,4 +1,4 @@
-package com.baeldung.java.networking.interfaces;
+package com.baeldung.networking.interfaces;
import org.junit.Test;
diff --git a/core-java/src/test/java/com/baeldung/networking/udp/UDPLiveTest.java b/core-java-networking/src/test/java/com/baeldung/networking/udp/UDPLiveTest.java
similarity index 100%
rename from core-java/src/test/java/com/baeldung/networking/udp/UDPLiveTest.java
rename to core-java-networking/src/test/java/com/baeldung/networking/udp/UDPLiveTest.java
diff --git a/core-java/src/test/java/com/baeldung/networking/udp/broadcast/BroadcastLiveTest.java b/core-java-networking/src/test/java/com/baeldung/networking/udp/broadcast/BroadcastLiveTest.java
similarity index 100%
rename from core-java/src/test/java/com/baeldung/networking/udp/broadcast/BroadcastLiveTest.java
rename to core-java-networking/src/test/java/com/baeldung/networking/udp/broadcast/BroadcastLiveTest.java
diff --git a/core-java/src/test/java/com/baeldung/networking/udp/multicast/MulticastLiveTest.java b/core-java-networking/src/test/java/com/baeldung/networking/udp/multicast/MulticastLiveTest.java
similarity index 100%
rename from core-java/src/test/java/com/baeldung/networking/udp/multicast/MulticastLiveTest.java
rename to core-java-networking/src/test/java/com/baeldung/networking/udp/multicast/MulticastLiveTest.java
diff --git a/core-java/src/test/java/com/baeldung/javanetworking/uriurl/test/URIDemoLiveTest.java b/core-java-networking/src/test/java/com/baeldung/networking/uriurl/URIDemoLiveTest.java
similarity index 95%
rename from core-java/src/test/java/com/baeldung/javanetworking/uriurl/test/URIDemoLiveTest.java
rename to core-java-networking/src/test/java/com/baeldung/networking/uriurl/URIDemoLiveTest.java
index 0c312ff613..3b73cc0943 100644
--- a/core-java/src/test/java/com/baeldung/javanetworking/uriurl/test/URIDemoLiveTest.java
+++ b/core-java-networking/src/test/java/com/baeldung/networking/uriurl/URIDemoLiveTest.java
@@ -1,4 +1,4 @@
-package com.baeldung.javanetworking.uriurl.test;
+package com.baeldung.networking.uriurl;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
@@ -20,7 +20,7 @@ import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
-import com.baeldung.javanetworking.uriurl.URLDemo;
+import com.baeldung.networking.uriurl.URLDemo;
@FixMethodOrder
public class URIDemoLiveTest {
diff --git a/core-java/src/test/java/com/baeldung/javanetworking/uriurl/URIvsURLUnitTest.java b/core-java-networking/src/test/java/com/baeldung/networking/uriurl/URIvsURLUnitTest.java
similarity index 98%
rename from core-java/src/test/java/com/baeldung/javanetworking/uriurl/URIvsURLUnitTest.java
rename to core-java-networking/src/test/java/com/baeldung/networking/uriurl/URIvsURLUnitTest.java
index 8837dc5556..ec1cb4c0c9 100644
--- a/core-java/src/test/java/com/baeldung/javanetworking/uriurl/URIvsURLUnitTest.java
+++ b/core-java-networking/src/test/java/com/baeldung/networking/uriurl/URIvsURLUnitTest.java
@@ -1,4 +1,4 @@
-package com.baeldung.javanetworking.uriurl;
+package com.baeldung.networking.uriurl;
import java.io.IOException;
import java.net.MalformedURLException;
diff --git a/core-java/src/test/java/com/baeldung/javanetworking/uriurl/test/URLDemoLiveTest.java b/core-java-networking/src/test/java/com/baeldung/networking/uriurl/URLDemoLiveTest.java
similarity index 97%
rename from core-java/src/test/java/com/baeldung/javanetworking/uriurl/test/URLDemoLiveTest.java
rename to core-java-networking/src/test/java/com/baeldung/networking/uriurl/URLDemoLiveTest.java
index 15f53ed878..a9104311e6 100644
--- a/core-java/src/test/java/com/baeldung/javanetworking/uriurl/test/URLDemoLiveTest.java
+++ b/core-java-networking/src/test/java/com/baeldung/networking/uriurl/URLDemoLiveTest.java
@@ -1,4 +1,4 @@
-package com.baeldung.javanetworking.uriurl.test;
+package com.baeldung.networking.uriurl;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
@@ -18,7 +18,7 @@ import org.junit.Test;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
-import com.baeldung.javanetworking.uriurl.URLDemo;
+import com.baeldung.networking.uriurl.URLDemo;
@FixMethodOrder
public class URLDemoLiveTest {
diff --git a/core-java/src/test/java/com/baeldung/java/networking/url/UrlUnitTest.java b/core-java-networking/src/test/java/com/baeldung/networking/url/UrlUnitTest.java
similarity index 98%
rename from core-java/src/test/java/com/baeldung/java/networking/url/UrlUnitTest.java
rename to core-java-networking/src/test/java/com/baeldung/networking/url/UrlUnitTest.java
index 505d9595ab..112f2cf53f 100644
--- a/core-java/src/test/java/com/baeldung/java/networking/url/UrlUnitTest.java
+++ b/core-java-networking/src/test/java/com/baeldung/networking/url/UrlUnitTest.java
@@ -1,4 +1,4 @@
-package com.baeldung.java.networking.url;
+package com.baeldung.networking.url;
import static org.junit.Assert.assertEquals;
diff --git a/core-java-perf/README.md b/core-java-perf/README.md
new file mode 100644
index 0000000000..6af1c82a0a
--- /dev/null
+++ b/core-java-perf/README.md
@@ -0,0 +1,4 @@
+## Core Java Performance
+
+### Relevant Articles:
+- [Verbose Garbage Collection in Java](https://www.baeldung.com/java-verbose-gc)
diff --git a/core-java-perf/pom.xml b/core-java-perf/pom.xml
new file mode 100644
index 0000000000..062f76db77
--- /dev/null
+++ b/core-java-perf/pom.xml
@@ -0,0 +1,33 @@
+
+ 4.0.0
+ com.baeldung
+ core-java-perf
+ 0.1.0-SNAPSHOT
+ jar
+ core-java-perf
+
+
+ com.baeldung
+ parent-java
+ 0.0.1-SNAPSHOT
+ ../parent-java
+
+
+
+
+ org.apache.commons
+ commons-lang3
+ ${commons-lang3.version}
+
+
+
+
+
+
+
+ 3.8.1
+
+
+
+
diff --git a/core-java-perf/src/main/java/com/baeldung/gc/VerboseGarbageCollectorRunner.java b/core-java-perf/src/main/java/com/baeldung/gc/VerboseGarbageCollectorRunner.java
new file mode 100644
index 0000000000..f57580bbb5
--- /dev/null
+++ b/core-java-perf/src/main/java/com/baeldung/gc/VerboseGarbageCollectorRunner.java
@@ -0,0 +1,63 @@
+package com.baeldung.gc;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * A simple Java program to demonstrate how to enable verbose Garbage Collection (GC) logging.
+ *
+ * This simple program loads 3 million {@link java.lang.String} instances into a {@link java.util.HashMap}
+ * object before making an explicit call to the garbage collector using System.gc().
+ *
+ * Finally, it removes 2 million of the {@link java.lang.String} instances from the {@link java.util.HashMap}.
+ * We also explicitly use System.out.println to make interpreting the output easier.
+ *
+ * Run this program with the following arguments to see verbose GC logging in its complete form:
+ *