iSharkFly-Docs
/
java-tutorials
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Merge remote-tracking branch 'upstream/master'

This commit is contained in:
Alessio Stalla 2019-04-24 16:26:45 +02:00
parent ca1aafb23c ebde333439
commit d3b3898737
1284 changed files with 71649 additions and 1800 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
.gitignore vendored
View File

@ -19,6 +19,7 @@
.idea/
*.iml
*.iws
out/
# Mac
.DS_Store
@ -27,6 +28,9 @@
log/
target/
# Gradle
.gradle/
spring-openid/src/main/resources/application.properties
.recommenders/
/spring-hibernate4/nbproject/

5
akka-streams/pom.xml
View File

@ -14,18 +14,19 @@
<dependencies>
<dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-stream_2.11</artifactId>
<artifactId>akka-stream_${scala.version}</artifactId>
<version>${akkastreams.version}</version>
</dependency>
<dependency>
<groupId>com.typesafe.akka</groupId>
<artifactId>akka-stream-testkit_2.11</artifactId>
<artifactId>akka-stream-testkit_${scala.version}</artifactId>
<version>${akkastreams.version}</version>
</dependency>
</dependencies>
<properties>
<akkastreams.version>2.5.2</akkastreams.version>
<scala.version>2.11</scala.version>
</properties>
</project>

45
algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/relativelyprime/RelativelyPrime.java Normal file
View File

@ -0,0 +1,45 @@
package com.baeldung.algorithms.relativelyprime;
import java.math.BigInteger;
class RelativelyPrime {
static boolean iterativeRelativelyPrime(int a, int b) {
return iterativeGCD(a, b) == 1;
}
static boolean recursiveRelativelyPrime(int a, int b) {
return recursiveGCD(a, b) == 1;
}
static boolean bigIntegerRelativelyPrime(int a, int b) {
return BigInteger.valueOf(a).gcd(BigInteger.valueOf(b)).equals(BigInteger.ONE);
}
private static int iterativeGCD(int a, int b) {
int tmp;
while (b != 0) {
if (a < b) {
tmp = a;
a = b;
b = tmp;
}
tmp = b;
b = a % b;
a = tmp;
}
return a;
}
private static int recursiveGCD(int a, int b) {
if (b == 0) {
return a;
}
if (a < b) {
return recursiveGCD(b, a);
}
return recursiveGCD(b, a % b);
}
}

2
algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/reversingtree/TreeNode.java
View File

@ -30,7 +30,7 @@ public class TreeNode {
this.leftChild = leftChild;
}
public TreeNode(int value, TreeNode rightChild, TreeNode leftChild) {
public TreeNode(int value, TreeNode leftChild, TreeNode rightChild) {
this.value = value;
this.rightChild = rightChild;
this.leftChild = leftChild;

15
algorithms-miscellaneous-2/src/main/java/com/baeldung/algorithms/reversingtree/TreeReverser.java
View File

@ -4,21 +4,6 @@ import java.util.LinkedList;
public class TreeReverser {
public TreeNode createBinaryTree() {
TreeNode leaf1 = new TreeNode(3);
TreeNode leaf2 = new TreeNode(1);
TreeNode leaf3 = new TreeNode(9);
TreeNode leaf4 = new TreeNode(6);
TreeNode nodeLeft = new TreeNode(2, leaf1, leaf2);
TreeNode nodeRight = new TreeNode(7, leaf3, leaf4);
TreeNode root = new TreeNode(4, nodeRight, nodeLeft);
return root;
}
public void reverseRecursive(TreeNode treeNode) {
if (treeNode == null) {
return;

51
algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/relativelyprime/RelativelyPrimeUnitTest.java Normal file
View File

@ -0,0 +1,51 @@
package com.baeldung.algorithms.relativelyprime;
import org.junit.Test;
import static com.baeldung.algorithms.relativelyprime.RelativelyPrime.*;
import static org.assertj.core.api.Assertions.assertThat;
public class RelativelyPrimeUnitTest {
@Test
public void givenNonRelativelyPrimeNumbers_whenCheckingIteratively_shouldReturnFalse() {
boolean result = iterativeRelativelyPrime(45, 35);
assertThat(result).isFalse();
}
@Test
public void givenRelativelyPrimeNumbers_whenCheckingIteratively_shouldReturnTrue() {
boolean result = iterativeRelativelyPrime(500, 501);
assertThat(result).isTrue();
}
@Test
public void givenNonRelativelyPrimeNumbers_whenCheckingRecursively_shouldReturnFalse() {
boolean result = recursiveRelativelyPrime(45, 35);
assertThat(result).isFalse();
}
@Test
public void givenRelativelyPrimeNumbers_whenCheckingRecursively_shouldReturnTrue() {
boolean result = recursiveRelativelyPrime(500, 501);
assertThat(result).isTrue();
}
@Test
public void givenNonRelativelyPrimeNumbers_whenCheckingUsingBigIntegers_shouldReturnFalse() {
boolean result = bigIntegerRelativelyPrime(45, 35);
assertThat(result).isFalse();
}
@Test
public void givenRelativelyPrimeNumbers_whenCheckingBigIntegers_shouldReturnTrue() {
boolean result = bigIntegerRelativelyPrime(500, 501);
assertThat(result).isTrue();
}
}

18
algorithms-miscellaneous-2/src/test/java/com/baeldung/algorithms/reversingtree/TreeReverserUnitTest.java
View File

@ -10,7 +10,7 @@ public class TreeReverserUnitTest {
public void givenTreeWhenReversingRecursivelyThenReversed() {
TreeReverser reverser = new TreeReverser();
TreeNode treeNode = reverser.createBinaryTree();
TreeNode treeNode = createBinaryTree();
reverser.reverseRecursive(treeNode);
@ -22,7 +22,7 @@ public class TreeReverserUnitTest {
public void givenTreeWhenReversingIterativelyThenReversed() {
TreeReverser reverser = new TreeReverser();
TreeNode treeNode = reverser.createBinaryTree();
TreeNode treeNode = createBinaryTree();
reverser.reverseIterative(treeNode);
@ -30,4 +30,18 @@ public class TreeReverserUnitTest {
.trim());
}
private TreeNode createBinaryTree() {
TreeNode leaf1 = new TreeNode(1);
TreeNode leaf2 = new TreeNode(3);
TreeNode leaf3 = new TreeNode(6);
TreeNode leaf4 = new TreeNode(9);
TreeNode nodeRight = new TreeNode(7, leaf3, leaf4);
TreeNode nodeLeft = new TreeNode(2, leaf1, leaf2);
TreeNode root = new TreeNode(4, nodeLeft, nodeRight);
return root;
}
}

16
antlr/pom.xml
View File

@ -10,6 +10,14 @@
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.antlr</groupId>
<artifactId>antlr4-runtime</artifactId>
<version>${antlr.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
@ -44,13 +52,7 @@
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.antlr</groupId>
<artifactId>antlr4-runtime</artifactId>
<version>${antlr.version}</version>
</dependency>
</dependencies>
<properties>
<antlr.version>4.7.1</antlr.version>
<mojo.version>3.0.0</mojo.version>

30
apache-cxf/sse-jaxrs/sse-jaxrs-client/pom.xml
View File

@ -12,9 +12,18 @@
<version>0.0.1-SNAPSHOT</version>
</parent>
<properties>
<cxf-version>3.2.0</cxf-version>
</properties>
<dependencies>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-rs-client</artifactId>
<version>${cxf-version}</version>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-rs-sse</artifactId>
<version>${cxf-version}</version>
</dependency>
</dependencies>
<build>
<plugins>
@ -45,17 +54,8 @@
</plugins>
</build>
<dependencies>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-rs-client</artifactId>
<version>${cxf-version}</version>
</dependency>
<dependency>
<groupId>org.apache.cxf</groupId>
<artifactId>cxf-rt-rs-sse</artifactId>
<version>${cxf-version}</version>
</dependency>
</dependencies>
<properties>
<cxf-version>3.2.0</cxf-version>
</properties>
</project>

54
apache-cxf/sse-jaxrs/sse-jaxrs-server/pom.xml
View File

@ -13,11 +13,28 @@
<version>0.0.1-SNAPSHOT</version>
</parent>
<properties>
<liberty-maven-plugin.version>2.4.2</liberty-maven-plugin.version>
<failOnMissingWebXml>false</failOnMissingWebXml>
<openliberty-version>18.0.0.2</openliberty-version>
</properties>
<dependencies>
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.enterprise</groupId>
<artifactId>cdi-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.json.bind</groupId>
<artifactId>javax.json.bind-api</artifactId>
<version>1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<finalName>${project.artifactId}</finalName>
@ -59,27 +76,10 @@
</plugins>
</build>
<dependencies>
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.1</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.enterprise</groupId>
<artifactId>cdi-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>javax.json.bind</groupId>
<artifactId>javax.json.bind-api</artifactId>
<version>1.0</version>
<scope>provided</scope>
</dependency>
</dependencies>
<properties>
<liberty-maven-plugin.version>2.4.2</liberty-maven-plugin.version>
<failOnMissingWebXml>false</failOnMissingWebXml>
<openliberty-version>18.0.0.2</openliberty-version>
</properties>
</project>

6
apache-meecrowave/pom.xml
View File

@ -7,6 +7,12 @@
<name>apache-meecrowave</name>
<description>A sample REST API application with Meecrowave</description>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.apache.meecrowave/meecrowave-core -->
<dependency>

2
apache-meecrowave/src/test/java/com/baeldung/meecrowave/ArticleEndpointsTest.java → apache-meecrowave/src/test/java/com/baeldung/meecrowave/ArticleEndpointsUnitTest.java
View File

@ -17,7 +17,7 @@ import okhttp3.Request;
import okhttp3.Response;
@RunWith(MonoMeecrowave.Runner.class)
public class ArticleEndpointsTest {
public class ArticleEndpointsUnitTest {
@ConfigurationInject
private Meecrowave.Builder config;

2
azure/README.md
View File

@ -1,4 +1,4 @@
### Relevant Articles:
- [Deploy Spring Boot App to Azure](http://www.baeldung.com/spring-boot-azure)
- [Deploy a Spring Boot App to Azure](http://www.baeldung.com/spring-boot-azure)

2
blade/README.md
View File

@ -1,5 +1,5 @@
### Relevant Articles:
- [Blade - A Complete GuideBook](http://www.baeldung.com/blade)
- [Blade – A Complete Guidebook](http://www.baeldung.com/blade)
Run Integration Tests with `mvn integration-test`

3
cloud-foundry-uaa/README.md Normal file
View File

@ -0,0 +1,3 @@
### Revelant Articles
- [A Quick Guide To Using Cloud Foundry UAA](https://www.baeldung.com/cloud-foundry-uaa)

7
cloud-foundry-uaa/cf-uaa-config/uaa.yml
View File

@ -1,12 +1,7 @@
issuer:
uri: http://localhost:8080/uaa
spring_profiles: postgresql,default
database.driverClassName: org.postgresql.Driver
database.url: jdbc:postgresql:uaadb2
database.username: postgres
database.password: postgres
spring_profiles: default,hsqldb
encryption:
active_key_label: CHANGE-THIS-KEY

20
cloud-foundry-uaa/cf-uaa-oauth2-client/pom.xml
View File

@ -2,24 +2,20 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>cf-uaa-oauth2-client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>uaa-client-webapp</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<parent>
<artifactId>parent-boot-2</artifactId>
<groupId>com.baeldung</groupId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-boot-2</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
@ -28,7 +24,6 @@
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-oauth2-client</artifactId>
</dependency>
</dependencies>
<build>
@ -40,4 +35,7 @@
</plugins>
</build>
<properties>
<java.version>1.8</java.version>
</properties>
</project>

22
cloud-foundry-uaa/cf-uaa-oauth2-client/src/main/resources/application.properties
View File

@ -1,23 +1,11 @@
# SECURITY OAUTH2 CLIENT (OAuth2ClientProperties)
#spring.security.oauth2.client.provider.*= # OAuth provider details.
#spring.security.oauth2.client.registration.*= # OAuth client registrations.
server.port=8081
#server.servlet.context-path=/uaa-client-webapp
uaa.url=http://localhost:8080/uaa
resource.server.url=http://localhost:8082
spring.security.oauth2.client.registration.uaa.client-name=UAA OAuth2 Client
spring.security.oauth2.client.registration.uaa.client-id=client1
spring.security.oauth2.client.registration.uaa.client-secret=client1
spring.security.oauth2.client.registration.uaa.authorization-grant-type=authorization_code
spring.security.oauth2.client.registration.uaa.client-name=Web App Client
spring.security.oauth2.client.registration.uaa.client-id=webappclient
spring.security.oauth2.client.registration.uaa.client-secret=webappclientsecret
spring.security.oauth2.client.registration.uaa.scope=resource.read,resource.write,openid,profile
spring.security.oauth2.client.registration.uaa.redirect-uri=http://localhost:8081/login/oauth2/code/uaa
#spring.security.oauth2.client.registration.uaa.redirect-uri=http://localhost:8081/**
spring.security.oauth2.client.provider.uaa.token-uri=${uaa.url}/oauth/token
spring.security.oauth2.client.provider.uaa.authorization-uri=${uaa.url}/oauth/authorize
spring.security.oauth2.client.provider.uaa.jwk-set-uri=${uaa.url}/token_keys
spring.security.oauth2.client.provider.uaa.user-info-uri=${uaa.url}/userinfo
spring.security.oauth2.client.provider.uaa.user-name-attribute=user_name
spring.security.oauth2.client.provider.uaa.issuer-uri=http://localhost:8080/uaa/oauth/token

21
cloud-foundry-uaa/cf-uaa-oauth2-resource-server/pom.xml
View File

@ -2,24 +2,20 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.baeldung.cfuaa</groupId>
<artifactId>cf-uaa-oauth2-resource-server</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>cf-uaa-oauth2-resource-server</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
</properties>
<parent>
<artifactId>parent-boot-2</artifactId>
<groupId>com.baeldung</groupId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../../parent-boot-2</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-oauth2-resource-server</artifactId>
@ -28,7 +24,6 @@
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
</dependencies>
<build>
@ -40,4 +35,8 @@
</plugins>
</build>
<properties>
<java.version>1.8</java.version>
</properties>
</project>

15
cloud-foundry-uaa/cf-uaa-oauth2-resource-server/src/main/resources/application.properties
View File

@ -1,16 +1,3 @@
server.port=8082
uaa.url=http://localhost:8080/uaa
#approch1
spring.security.oauth2.resourceserver.jwt.issuer-uri=${uaa.url}/oauth/token
#approch2
#spring.security.oauth2.resourceserver.jwt.jwk-set-uri=${uaa.url}/token_key
# SECURITY OAUTH2 CLIENT (OAuth2ClientProperties)
#security.oauth2.client.client-id=client1
#security.oauth2.client.client-secret=client1
#security.oauth2.resource.jwt.key-uri=${uaa.url}/token_key
#security.oauth2.resource.token-info-uri=${uaa.url}/oauth/check_token
spring.security.oauth2.resourceserver.jwt.issuer-uri=http://localhost:8080/uaa/oauth/token

7
core-groovy-2/README.md Normal file
View File

@ -0,0 +1,7 @@
# Groovy
## Relevant articles:
- [String Matching in Groovy](http://www.baeldung.com/)
- [Groovy def Keyword]

131
core-groovy-2/pom.xml Normal file
View File

@ -0,0 +1,131 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-groovy-2</artifactId>
<version>1.0-SNAPSHOT</version>
<name>core-groovy-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-modules</artifactId>
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy</artifactId>
<version>${groovy.version}</version>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-all</artifactId>
<version>${groovy-all.version}</version>
<type>pom</type>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-dateutil</artifactId>
<version>${groovy.version}</version>
</dependency>
<dependency>
<groupId>org.codehaus.groovy</groupId>
<artifactId>groovy-sql</artifactId>
<version>${groovy-sql.version}</version>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-runner</artifactId>
<version>${junit.platform.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.hsqldb</groupId>
<artifactId>hsqldb</artifactId>
<version>${hsqldb.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.spockframework</groupId>
<artifactId>spock-core</artifactId>
<version>${spock-core.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.codehaus.gmavenplus</groupId>
<artifactId>gmavenplus-plugin</artifactId>
<version>${gmavenplus-plugin.version}</version>
<executions>
<execution>
<goals>
<goal>addSources</goal>
<goal>addTestSources</goal>
<goal>compile</goal>
<goal>compileTests</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-failsafe-plugin</artifactId>
<version>${maven-failsafe-plugin.version}</version>
<dependencies>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-surefire-provider</artifactId>
<version>${junit.platform.version}</version>
</dependency>
</dependencies>
<executions>
<execution>
<id>junit5</id>
<goals>
<goal>integration-test</goal>
<goal>verify</goal>
</goals>
<configuration>
<includes>
<include>**/*Test5.java</include>
</includes>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.20.1</version>
<configuration>
<useFile>false</useFile>
<includes>
<include>**/*Test.java</include>
<include>**/*Spec.java</include>
</includes>
</configuration>
</plugin>
</plugins>
</build>
<repositories>
<repository>
<id>central</id>
<url>http://jcenter.bintray.com</url>
</repository>
</repositories>
<properties>
<junit.platform.version>1.0.0</junit.platform.version>
<groovy.version>2.5.6</groovy.version>
<groovy-all.version>2.5.6</groovy-all.version>
<groovy-sql.version>2.5.6</groovy-sql.version>
<hsqldb.version>2.4.0</hsqldb.version>
<spock-core.version>1.1-groovy-2.4</spock-core.version>
<gmavenplus-plugin.version>1.6</gmavenplus-plugin.version>
</properties>
</project>

79
core-groovy-2/src/test/groovy/com/baeldung/defkeyword/DefUnitTest.groovy Normal file
View File

@ -0,0 +1,79 @@
package com.baeldung.defkeyword
import org.codehaus.groovy.runtime.NullObject
import org.codehaus.groovy.runtime.typehandling.GroovyCastException
import groovy.transform.TypeChecked
import groovy.transform.TypeCheckingMode
@TypeChecked
class DefUnitTest extends GroovyTestCase {
def id
def firstName = "Samwell"
def listOfCountries = ['USA', 'UK', 'FRANCE', 'INDIA']
@TypeChecked(TypeCheckingMode.SKIP)
def multiply(x, y) {
return x*y
}
@TypeChecked(TypeCheckingMode.SKIP)
void testDefVariableDeclaration() {
def list
assert list.getClass() == org.codehaus.groovy.runtime.NullObject
assert list.is(null)
list = [1,2,4]
assert list instanceof ArrayList
}
@TypeChecked(TypeCheckingMode.SKIP)
void testTypeVariables() {
int rate = 200
try {
rate = [12] //GroovyCastException
rate = "nill" //GroovyCastException
} catch(GroovyCastException) {
println "Cannot assign anything other than integer"
}
}
@TypeChecked(TypeCheckingMode.SKIP)
void testDefVariableMultipleAssignment() {
def rate
assert rate == null
assert rate.getClass() == org.codehaus.groovy.runtime.NullObject
rate = 12
assert rate instanceof Integer
rate = "Not Available"
assert rate instanceof String
rate = [1, 4]
assert rate instanceof List
assert divide(12, 3) instanceof BigDecimal
assert divide(1, 0) instanceof String
}
def divide(int x, int y) {
if(y==0) {
return "Should not divide by 0"
} else {
return x/y
}
}
def greetMsg() {
println "Hello! I am Groovy"
}
void testDefVsType() {
def int count
assert count instanceof Integer
}
}

44
core-groovy-2/src/test/groovy/com/baeldung/strings/StringMatchingSpec.groovy Normal file
View File

@ -0,0 +1,44 @@
package com.baeldung.strings
import spock.lang.Specification
import java.util.regex.Pattern
class StringMatchingSpec extends Specification {
def "pattern operator example"() {
given: "a pattern"
def p = ~'foo'
expect:
p instanceof Pattern
and: "you can use slash strings to avoid escaping of blackslash"
def digitPattern = ~/\d*/
digitPattern.matcher('4711').matches()
}
def "match operator example"() {
expect:
'foobar' ==~ /.*oba.*/
and: "matching is strict"
!('foobar' ==~ /foo/)
}
def "find operator example"() {
when: "using the find operator"
def matcher = 'foo and bar, baz and buz' =~ /(\w+) and (\w+)/
then: "will find groups"
matcher.size() == 2
and: "can access groups using array"
matcher[0][0] == 'foo and bar'
matcher[1][2] == 'buz'
and: "you can use it as a predicate"
'foobarbaz' =~ /bar/
}
}

4
core-groovy/README.md
View File

@ -8,4 +8,8 @@
- [Types of Strings in Groovy](https://www.baeldung.com/groovy-strings)
- [A Quick Guide to Iterating a Map in Groovy](https://www.baeldung.com/groovy-map-iterating)
- [An Introduction to Traits in Groovy](https://www.baeldung.com/groovy-traits)
- [Closures in Groovy](https://www.baeldung.com/groovy-closures)
- [Finding Elements in Collections in Groovy](https://www.baeldung.com/groovy-collections-find-elements)
- [Lists in Groovy](https://www.baeldung.com/groovy-lists)
- [Converting a String to a Date in Groovy](https://www.baeldung.com/groovy-string-to-date)
- [Guide to I/O in Groovy](https://www.baeldung.com/groovy-io)

44
core-groovy/src/test/groovy/com/baeldung/strings/StringMatchingSpec.groovy Normal file
View File

@ -0,0 +1,44 @@
package com.baeldung.strings
import spock.lang.Specification
import java.util.regex.Pattern
class StringMatchingSpec extends Specification {
def "pattern operator example"() {
given: "a pattern"
def p = ~'foo'
expect:
p instanceof Pattern
and: "you can use slash strings to avoid escaping of blackslash"
def digitPattern = ~/\d*/
digitPattern.matcher('4711').matches()
}
def "match operator example"() {
expect:
'foobar' ==~ /.*oba.*/
and: "matching is strict"
!('foobar' ==~ /foo/)
}
def "find operator example"() {
when: "using the find operator"
def matcher = 'foo and bar, baz and buz' =~ /(\w+) and (\w+)/
then: "will find groups"
matcher.size() == 2
and: "can access groups using array"
matcher[0][0] == 'foo and bar'
matcher[1][2] == 'buz'
and: "you can use it as a predicate"
'foobarbaz' =~ /bar/
}
}

2
core-java-11/README.md
View File

@ -5,3 +5,5 @@
- [Java 11 String API Additions](https://www.baeldung.com/java-11-string-api)
- [Java 11 Nest Based Access Control](https://www.baeldung.com/java-nest-based-access-control)
- [Exploring the New HTTP Client in Java 9 and 11](https://www.baeldung.com/java-9-http-client)
- [An Introduction to Epsilon GC: A No-Op Experimental Garbage Collector](https://www.baeldung.com/jvm-epsilon-gc-garbage-collector)
- [Guide to jlink](https://www.baeldung.com/jlink)

9
core-java-11/pom.xml
View File

@ -14,6 +14,14 @@
<version>1.0.0-SNAPSHOT</version>
</parent>
<dependencies>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
@ -31,6 +39,7 @@
<properties>
<maven.compiler.source.version>11</maven.compiler.source.version>
<maven.compiler.target.version>11</maven.compiler.target.version>
<guava.version>27.1-jre</guava.version>
</properties>
</project>

32
core-java-11/src/test/java/com/baeldung/EmptyStringToEmptyOptionalUnitTest.java Normal file
View File

@ -0,0 +1,32 @@
package com.baeldung;
import com.google.common.base.Strings;
import org.junit.Assert;
import org.junit.Test;
import java.util.Optional;
import java.util.function.Predicate;
public class EmptyStringToEmptyOptionalUnitTest {
@Test
public void givenEmptyString_whenFilteringOnOptional_thenEmptyOptionalIsReturned() {
String str = "";
Optional<String> opt = Optional.ofNullable(str).filter(s -> !s.isEmpty());
Assert.assertFalse(opt.isPresent());
}
@Test
public void givenEmptyString_whenFilteringOnOptionalInJava11_thenEmptyOptionalIsReturned() {
String str = "";
Optional<String> opt = Optional.ofNullable(str).filter(Predicate.not(String::isEmpty));
Assert.assertFalse(opt.isPresent());
}
@Test
public void givenEmptyString_whenPassingResultOfEmptyToNullToOfNullable_thenEmptyOptionalIsReturned() {
String str = "";
Optional<String> opt = Optional.ofNullable(Strings.emptyToNull(str));
Assert.assertFalse(opt.isPresent());
}
}

1
core-java-12/pom.xml
View File

@ -34,6 +34,7 @@
<configuration>
<source>${maven.compiler.source.version}</source>
<target>${maven.compiler.target.version}</target>
<compilerArgs>--enable-preview</compilerArgs>
</configuration>
</plugin>
</plugins>

20
core-java-12/src/test/java/com/baeldung/collectors/CollectorsUnitTest.java
View File

@ -20,11 +20,7 @@ public class CollectorsUnitTest {
public void whenTeeing_ItShouldCombineTheResultsAsExpected() {
List<Integer> numbers = Arrays.asList(42, 4, 2, 24);
Range range = numbers.stream()
.collect(teeing(
minBy(Integer::compareTo),
maxBy(Integer::compareTo),
(min, max) -> new Range(min.orElse(null), max.orElse(null))
));
.collect(teeing(minBy(Integer::compareTo), maxBy(Integer::compareTo), (min, max) -> new Range(min.orElse(null), max.orElse(null))));
assertThat(range).isEqualTo(new Range(2, 42));
}
@ -54,11 +50,12 @@ public class CollectorsUnitTest {
@Override
public boolean equals(Object o) {
if (this == o) return true;
if (o == null || getClass() != o.getClass()) return false;
if (this == o)
return true;
if (o == null || getClass() != o.getClass())
return false;
Range range = (Range) o;
return Objects.equals(getMin(), range.getMin()) &&
Objects.equals(getMax(), range.getMax());
return Objects.equals(getMin(), range.getMin()) && Objects.equals(getMax(), range.getMax());
}
@Override
@ -68,10 +65,7 @@ public class CollectorsUnitTest {
@Override
public String toString() {
return "Range{" +
"min=" + min +
", max=" + max +
'}';
return "Range{" + "min=" + min + ", max=" + max + '}';
}
}
}

37
core-java-12/src/test/java/com/baeldung/switchExpression/SwitchUnitTest.java Normal file
View File

@ -0,0 +1,37 @@
package com.baeldung.switchExpression;
import org.junit.Assert;
import org.junit.Test;
public class SwitchUnitTest {
@Test
public void switchJava12(){
var month = Month.AUG;
var value = switch(month){
case JAN,JUN, JUL -> 3;
case FEB,SEP, OCT, NOV, DEC -> 1;
case MAR,MAY, APR, AUG -> 2;
};
Assert.assertEquals(value, 2);
}
@Test
public void switchLocalVariable(){
var month = Month.AUG;
int i = switch (month){
case JAN,JUN, JUL -> 3;
case FEB,SEP, OCT, NOV, DEC -> 1;
case MAR,MAY, APR, AUG -> {
int j = month.toString().length() * 4;
break j;
}
};
Assert.assertEquals(12, i);
}
enum Month {JAN, FEB, MAR, APR, MAY, JUN, JUL, AUG, SEP, OCT, NOV, DEC}
}

6
core-java-8-2/README.md Normal file
View File

@ -0,0 +1,6 @@
=========
## Core Java 8 Cookbooks and Examples (part 2)
### Relevant Articles:
- [Anonymous Classes in Java](http://www.baeldung.com/)

43
core-java-8-2/pom.xml Normal file
View File

@ -0,0 +1,43 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java-8-2</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-8-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-java</relativePath>
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>${maven-compiler-plugin.version}</version>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
</plugin>
</plugins>
</build>
</project>

2
core-java-8/README.md
View File

@ -3,7 +3,7 @@
## Core Java 8 Cookbooks and Examples
### Relevant Articles:
- [Java 8 Collectors](http://www.baeldung.com/java-8-collectors)
- [Guide to Java 8’s Collectors](http://www.baeldung.com/java-8-collectors)
- [Functional Interfaces in Java 8](http://www.baeldung.com/java-8-functional-interfaces)
- [Java 8 – Powerful Comparison with Lambdas](http://www.baeldung.com/java-8-sort-lambda)
- [New Features in Java 8](http://www.baeldung.com/java-8-new-features)

12
core-java-8/src/main/java/com/baeldung/Adder.java
View File

@ -1,12 +0,0 @@
package com.baeldung;
import java.util.function.Consumer;
import java.util.function.Function;
public interface Adder {
String addWithFunction(Function<String, String> f);
void addWithConsumer(Consumer<Integer> f);
}

18
core-java-8/src/main/java/com/baeldung/AdderImpl.java
View File

@ -1,18 +0,0 @@
package com.baeldung;
import java.util.function.Consumer;
import java.util.function.Function;
public class AdderImpl implements Adder {
@Override
public String addWithFunction(final Function<String, String> f) {
return f.apply("Something ");
}
@Override
public void addWithConsumer(final Consumer<Integer> f) {
}
}

2
core-java-8/src/main/java/com/baeldung/Bar.java → core-java-8/src/main/java/com/baeldung/java8/lambda/tips/Bar.java
View File

@ -1,4 +1,4 @@
package com.baeldung;
package com.baeldung.java8.lambda.tips;
@FunctionalInterface

2
core-java-8/src/main/java/com/baeldung/Baz.java → core-java-8/src/main/java/com/baeldung/java8/lambda/tips/Baz.java
View File

@ -1,4 +1,4 @@
package com.baeldung;
package com.baeldung.java8.lambda.tips;
@FunctionalInterface

2
core-java-8/src/main/java/com/baeldung/Foo.java → core-java-8/src/main/java/com/baeldung/java8/lambda/tips/Foo.java
View File

@ -1,4 +1,4 @@
package com.baeldung;
package com.baeldung.java8.lambda.tips;
@FunctionalInterface

2
core-java-8/src/main/java/com/baeldung/FooExtended.java → core-java-8/src/main/java/com/baeldung/java8/lambda/tips/FooExtended.java
View File

@ -1,4 +1,4 @@
package com.baeldung;
package com.baeldung.java8.lambda.tips;
@FunctionalInterface

12
core-java-8/src/main/java/com/baeldung/java8/lambda/tips/Processor.java Normal file
View File

@ -0,0 +1,12 @@
package com.baeldung.java8.lambda.tips;
import java.util.concurrent.Callable;
import java.util.function.Supplier;
public interface Processor {
String processWithCallable(Callable<String> c) throws Exception;
String processWithSupplier(Supplier<String> s);
}

20
core-java-8/src/main/java/com/baeldung/java8/lambda/tips/ProcessorImpl.java Normal file
View File

@ -0,0 +1,20 @@
package com.baeldung.java8.lambda.tips;
import java.util.concurrent.Callable;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Supplier;
public class ProcessorImpl implements Processor {
@Override
public String processWithCallable(Callable<String> c) throws Exception {
return c.call();
}
@Override
public String processWithSupplier(Supplier<String> s) {
return s.get();
}
}

2
core-java-8/src/main/java/com/baeldung/UseFoo.java → core-java-8/src/main/java/com/baeldung/java8/lambda/tips/UseFoo.java
View File

@ -1,4 +1,4 @@
package com.baeldung;
package com.baeldung.java8.lambda.tips;
import java.util.function.Function;

8
core-java-8/src/test/java/com/baeldung/java8/Java8FunctionalInteracesLambdasUnitTest.java → core-java-8/src/test/java/com/baeldung/java8/lambda/tips/Java8FunctionalInteracesLambdasUnitTest.java
View File

@ -1,8 +1,8 @@
package com.baeldung.java8;
package com.baeldung.java8.lambda.tips;
import com.baeldung.Foo;
import com.baeldung.FooExtended;
import com.baeldung.UseFoo;
import com.baeldung.java8.lambda.tips.Foo;
import com.baeldung.java8.lambda.tips.FooExtended;
import com.baeldung.java8.lambda.tips.UseFoo;
import org.junit.Before;
import org.junit.Test;

7
core-java-8/src/test/java/com/baeldung/reduceIfelse/CalculatorUnitTest.java
View File

@ -29,4 +29,11 @@ public class CalculatorUnitTest {
int result = calculator.calculate(new AddCommand(3, 7));
assertEquals(10, result);
}
@Test
public void whenCalculateUsingFactory_thenReturnCorrectResult() {
Calculator calculator = new Calculator();
int result = calculator.calculateUsingFactory(3, 4, "add");
assertEquals(7, result);
}
}

18
core-java-9/README.md
View File

@ -5,25 +5,21 @@
[Java 9 New Features](http://www.baeldung.com/new-java-9)
### Relevant Articles:
- [Java 9 Stream API Improvements](http://www.baeldung.com/java-9-stream-api)
- [Java 9 Convenience Factory Methods for Collections](http://www.baeldung.com/java-9-collections-factory-methods)
- [Java 9 New Features](https://www.baeldung.com/new-java-9)
- [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)
- [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)
- [Java 9 Optional API Additions](http://www.baeldung.com/java-9-optional)
- [Java 9 Reactive Streams](http://www.baeldung.com/java-9-reactive-streams)
- [Java 9 java.util.Objects Additions](http://www.baeldung.com/java-9-objects-new)
- [Java 9 Variable Handles Demistyfied](http://www.baeldung.com/java-variable-handles)
- [Java 9 Variable Handles Demystified](http://www.baeldung.com/java-variable-handles)
- [Exploring the New HTTP Client in Java 9 and 11](http://www.baeldung.com/java-9-http-client)
- [Method Handles in Java](http://www.baeldung.com/java-method-handles)
- [Introduction to Chronicle Queue](http://www.baeldung.com/java-chronicle-queue)
- [A Guide to Java 9 Modularity](http://www.baeldung.com/java-9-modularity)
- [Optional orElse Optional](http://www.baeldung.com/java-optional-or-else-optional)
- [Java 9 java.lang.Module API](http://www.baeldung.com/java-9-module-api)
- [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
- [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
- [Java 9 Platform Logging API](https://www.baeldung.com/java-9-logging-api)
- [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)
- [Multi-Release Jar Files](https://www.baeldung.com/java-multi-release-jar)
- [Ahead of Time Compilation (AoT)](https://www.baeldung.com/ahead-of-time-compilation)
- [Java 9 Process API Improvements](https://www.baeldung.com/java-9-process-api)
- [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)

6
core-java-collections-map/README.md Normal file
View File

@ -0,0 +1,6 @@
=========
## Core Java Collections 2
### Relevant Articles:
- Java - Copying a HashMap

78
core-java-collections-map/pom.xml Normal file
View File

@ -0,0 +1,78 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-collections-map</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-map</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-java</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-lang3</artifactId>
<version>${commons-lang3.version}</version>
</dependency>
<dependency>
<groupId>org.eclipse.collections</groupId>
<artifactId>eclipse-collections</artifactId>
<version>${eclipse.collections.version}</version>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.junit.platform</groupId>
<artifactId>junit-platform-runner</artifactId>
<version>${junit.platform.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-core</artifactId>
<version>${openjdk.jmh.version}</version>
</dependency>
<dependency>
<groupId>org.openjdk.jmh</groupId>
<artifactId>jmh-generator-annprocess</artifactId>
<version>${openjdk.jmh.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-exec</artifactId>
<version>${commons-exec.version}</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>${lombok.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
<properties>
<openjdk.jmh.version>1.19</openjdk.jmh.version>
<junit.platform.version>1.2.0</junit.platform.version>
<commons-lang3.version>3.8.1</commons-lang3.version>
<commons-collections4.version>4.1</commons-collections4.version>
<collections-generic.version>4.01</collections-generic.version>
<avaitility.version>1.7.0</avaitility.version>
<assertj.version>3.11.1</assertj.version>
<eclipse.collections.version>7.1.0</eclipse.collections.version>
<commons-exec.version>1.3</commons-exec.version>
</properties>
</project>

55
core-java-collections-map/src/main/java/com/baeldung/copyinghashmap/CopyHashMap.java Normal file
View File

@ -0,0 +1,55 @@
package com.baeldung.copyinghashmap;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Set;
import java.util.stream.Collectors;
import org.apache.commons.lang3.SerializationUtils;
public class CopyHashMap {
public static <String, Employee> HashMap<String, Employee> copyUsingConstructor(HashMap<String, Employee> originalMap) {
return new HashMap<String, Employee>(originalMap);
}
public static <String, Employee> HashMap<String, Employee> copyUsingClone(HashMap<String, Employee> originalMap) {
return (HashMap<String, Employee>) originalMap.clone();
}
public static <String, Employee> HashMap<String, Employee> copyUsingPut(HashMap<String, Employee> originalMap) {
HashMap<String, Employee> shallowCopy = new HashMap<String, Employee>();
Set<Entry<String, Employee>> entries = originalMap.entrySet();
for(Map.Entry<String, Employee> mapEntry: entries) {
shallowCopy.put(mapEntry.getKey(), mapEntry.getValue());
}
return shallowCopy;
}
public static <String, Employee> HashMap<String, Employee> copyUsingPutAll(HashMap<String, Employee> originalMap) {
HashMap<String, Employee> shallowCopy = new HashMap<String, Employee>();
shallowCopy.putAll(originalMap);
return shallowCopy;
}
public static <String, Employee> HashMap<String, Employee> copyUsingJava8Stream(HashMap<String, Employee> originalMap) {
Set<Entry<String, Employee>> entries = originalMap.entrySet();
HashMap<String, Employee> shallowCopy = (HashMap<String, Employee>) entries
.stream()
.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
return shallowCopy;
}
public static <String, Employee> HashMap<String, Employee> shallowCopy(HashMap<String, Employee> originalMap) {
return (HashMap<String, Employee>) originalMap.clone();
}
public static <String, Employee> HashMap<String, Employee> deepCopy(HashMap<String, Employee> originalMap) {
return SerializationUtils.clone(originalMap);
}
}

77
core-java-collections-map/src/test/java/com/baeldung/copyinghashmap/CopyHashMapUnitTest.java Normal file
View File

@ -0,0 +1,77 @@
package com.baeldung.copyinghashmap;
import static org.assertj.core.api.Assertions.assertThat;
import java.util.HashMap;
import java.util.Map;
import org.junit.Test;
import com.google.common.collect.ImmutableMap;
public class CopyHashMapUnitTest {
@Test
public void givenHashMap_whenShallowCopy_thenCopyisNotSameAsOriginal() {
HashMap<String, Employee> map = new HashMap<>();
Employee emp1 = new Employee("John");
Employee emp2 = new Employee("Norman");
map.put("emp1",emp1);
map.put("emp2",emp2);
HashMap<String, Employee> shallowCopy = CopyHashMap.shallowCopy(map);
assertThat(shallowCopy).isNotSameAs(map);
}
@Test
public void givenHashMap_whenShallowCopyModifyingOriginalObject_thenCopyShouldChange() {
HashMap<String, Employee> map = new HashMap<>();
Employee emp1 = new Employee("John");
Employee emp2 = new Employee("Norman");
map.put("emp1",emp1);
map.put("emp2",emp2);
HashMap<String, Employee> shallowCopy = CopyHashMap.shallowCopy(map);
emp1.setName("Johny");
assertThat(shallowCopy.get("emp1")).isEqualTo(map.get("emp1"));
}
@Test
public void givenHashMap_whenDeepCopyModifyingOriginalObject_thenCopyShouldNotChange() {
HashMap<String, Employee> map = new HashMap<>();
Employee emp1 = new Employee("John");
Employee emp2 = new Employee("Norman");
map.put("emp1",emp1);
map.put("emp2",emp2);
HashMap<String, Employee> deepCopy = CopyHashMap.deepCopy(map);
emp1.setName("Johny");
assertThat(deepCopy.get("emp1")).isNotEqualTo(map.get("emp1"));
}
@Test
public void givenImmutableMap_whenCopyUsingGuava_thenCopyShouldNotChange() {
Employee emp1 = new Employee("John");
Employee emp2 = new Employee("Norman");
Map<String, Employee> map = ImmutableMap.<String, Employee> builder()
.put("emp1",emp1)
.put("emp2",emp2)
.build();
Map<String, Employee> shallowCopy = ImmutableMap.copyOf(map);
assertThat(shallowCopy).isSameAs(map);
}
}

28
core-java-collections-map/src/test/java/com/baeldung/copyinghashmap/Employee.java Normal file
View File

@ -0,0 +1,28 @@
package com.baeldung.copyinghashmap;
import java.io.Serializable;
public class Employee implements Serializable{
private String name;
public Employee(String name) {
super();
this.name = name;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
@Override
public String toString() {
return this.name;
}
}

6
core-java-collections-set/README.md Normal file
View File

@ -0,0 +1,6 @@
=========
## Core Java Sets Cookbooks and Examples
### Relevant Articles:
- [Set Operations in Java](http://www.baeldung.com/set-operations-in-java)

33
core-java-collections-set/pom.xml Normal file
View File

@ -0,0 +1,33 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-collections-set</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-collections-set</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-java</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>com.google.guava</groupId>
<artifactId>guava</artifactId>
<version>${guava.version}</version>
</dependency>
<dependency>
<groupId>org.apache.commons</groupId>
<artifactId>commons-collections4</artifactId>
<version>${commons-collections4.version}</version>
</dependency>
</dependencies>
<properties>
<commons-collections4.version>4.3</commons-collections4.version>
<guava.version>27.1-jre</guava.version>
</properties>
</project>

93
core-java-collections-set/src/test/java/com/baeldung/set/SetOperationsUnitTest.java Normal file
View File

@ -0,0 +1,93 @@
package com.baeldung.set;
import static org.junit.Assert.*;
import org.apache.commons.collections4.SetUtils;
import org.junit.Test;
import com.google.common.collect.Sets;
import java.util.Arrays;
import java.util.HashSet;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
public class SetOperationsUnitTest {
private Set<Integer> setA = setOf(1,2,3,4);
private Set<Integer> setB = setOf(2,4,6,8);
private static Set<Integer> setOf(Integer... values) {
return new HashSet<Integer>(Arrays.asList(values));
}
@Test
public void givenTwoSets_WhenWeRetainAll_ThenWeIntersectThem() {
Set<Integer> intersectSet = new HashSet<>(setA);
intersectSet.retainAll(setB);
assertEquals(setOf(2,4), intersectSet);
}
@Test
public void givenTwoSets_WhenWeAddAll_ThenWeUnionThem() {
Set<Integer> unionSet = new HashSet<>(setA);
unionSet.addAll(setB);
assertEquals(setOf(1,2,3,4,6,8), unionSet);
}
@Test
public void givenTwoSets_WhenRemoveAll_ThenWeGetTheDifference() {
Set<Integer> differenceSet = new HashSet<>(setA);
differenceSet.removeAll(setB);
assertEquals(setOf(1,3), differenceSet);
}
@Test
public void givenTwoStreams_WhenWeFilterThem_ThenWeCanGetTheIntersect() {
Set<Integer> intersectSet = setA.stream()
.filter(setB::contains)
.collect(Collectors.toSet());
assertEquals(setOf(2,4), intersectSet);
}
@Test
public void givenTwoStreams_WhenWeConcatThem_ThenWeGetTheUnion() {
Set<Integer> unionSet = Stream.concat(setA.stream(), setB.stream())
.collect(Collectors.toSet());
assertEquals(setOf(1,2,3,4,6,8), unionSet);
}
@Test
public void givenTwoStreams_WhenWeFilterThem_ThenWeCanGetTheDifference() {
Set<Integer> differenceSet = setA.stream()
.filter(val -> !setB.contains(val))
.collect(Collectors.toSet());
assertEquals(setOf(1,3), differenceSet);
}
@Test
public void givenTwoSets_WhenWeUseApacheCommonsIntersect_ThenWeGetTheIntersect() {
Set<Integer> intersectSet = SetUtils.intersection(setA, setB);
assertEquals(setOf(2,4), intersectSet);
}
@Test
public void givenTwoSets_WhenWeUseApacheCommonsUnion_ThenWeGetTheUnion() {
Set<Integer> unionSet = SetUtils.union(setA, setB);
assertEquals(setOf(1,2,3,4,6,8), unionSet);
}
@Test
public void givenTwoSets_WhenWeUseGuavaIntersect_ThenWeGetTheIntersect() {
Set<Integer> intersectSet = Sets.intersection(setA, setB);
assertEquals(setOf(2,4), intersectSet);
}
@Test
public void givenTwoSets_WhenWeUseGuavaUnion_ThenWeGetTheUnion() {
Set<Integer> unionSet = Sets.union(setA, setB);
assertEquals(setOf(1,2,3,4,6,8), unionSet);
}
}

3
core-java-collections/README.md
View File

@ -3,7 +3,7 @@
## Core Java Collections Cookbooks and Examples
### Relevant Articles:
- [Java - Combine Multiple Collections](http://www.baeldung.com/java-combine-multiple-collections)
- [Java – Combine Multiple Collections](http://www.baeldung.com/java-combine-multiple-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)
@ -33,3 +33,4 @@
- [Differences Between HashMap and Hashtable](https://www.baeldung.com/hashmap-hashtable-differences)
- [Java ArrayList vs Vector](https://www.baeldung.com/java-arraylist-vs-vector)
- [Defining a Char Stack in Java](https://www.baeldung.com/java-char-stack)
- [Time Comparison of Arrays.sort(Object[]) and Arrays.sort(int[])](https://www.baeldung.com/arrays-sortobject-vs-sortint)

4
core-java-concurrency-advanced/README.md
View File

@ -12,7 +12,7 @@
- [Guide to the Java Phaser](http://www.baeldung.com/java-phaser)
- [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)
- [Guide to the Volatile Keyword in Java](http://www.baeldung.com/java-volatile)
- [Semaphores in Java](http://www.baeldung.com/java-semaphore)
- [Daemon Threads in Java](http://www.baeldung.com/java-daemon-thread)
- [Priority-based Job Scheduling in Java](http://www.baeldung.com/java-priority-job-schedule)
@ -20,6 +20,6 @@
- [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)
- [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)
- [Passing Parameters to Java Threads](https://www.baeldung.com/java-thread-parameters)

7
core-java-concurrency-basic/README.md
View File

@ -7,12 +7,13 @@
- [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)
- [Guide to the 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)
- [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)
- [What is Thread-Safety and How to Achieve it](https://www.baeldung.com/java-thread-safety)
- [What is Thread-Safety and How to Achieve it?](https://www.baeldung.com/java-thread-safety)
- [How to Start a Thread in Java](https://www.baeldung.com/java-start-thread)

4
core-java-io/README.md
View File

@ -6,7 +6,7 @@
- [How to Read a Large File Efficiently with Java](http://www.baeldung.com/java-read-lines-large-file)
- [Java InputStream to String](http://www.baeldung.com/convert-input-stream-to-string)
- [Java – Write to File](http://www.baeldung.com/java-write-to-file)
- [Java - Convert File to InputStream](http://www.baeldung.com/convert-file-to-input-stream)
- [Java – Convert File to InputStream](http://www.baeldung.com/convert-file-to-input-stream)
- [Java Scanner](http://www.baeldung.com/java-scanner)
- [Java – Byte Array to Writer](http://www.baeldung.com/java-convert-byte-array-to-writer)
- [Java – Directory Size](http://www.baeldung.com/java-folder-size)
@ -14,7 +14,7 @@
- [File Size in Java](http://www.baeldung.com/java-file-size)
- [Comparing getPath(), getAbsolutePath(), and getCanonicalPath() in Java](http://www.baeldung.com/java-path)
- [Using Java MappedByteBuffer](http://www.baeldung.com/java-mapped-byte-buffer)
- [Copy a File with Java](http://www.baeldung.com/java-copy-file)
- [How to Copy a File with Java](http://www.baeldung.com/java-copy-file)
- [Java – Append Data to a File](http://www.baeldung.com/java-append-to-file)
- [FileNotFoundException in Java](http://www.baeldung.com/java-filenotfound-exception)
- [How to Read a File in Java](http://www.baeldung.com/reading-file-in-java)

165
core-java-io/src/test/java/com/baeldung/filechannel/FileChannelUnitTest.java Normal file
View File

@ -0,0 +1,165 @@
package com.baeldung.filechannel;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotNull;
import java.io.ByteArrayOutputStream;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.RandomAccessFile;
import java.nio.ByteBuffer;
import java.nio.MappedByteBuffer;
import java.nio.channels.FileChannel;
import java.nio.channels.FileLock;
import java.nio.charset.StandardCharsets;
import org.junit.Test;
public class FileChannelUnitTest {
@Test
public void givenFile_whenReadWithFileChannelUsingRandomAccessFile_thenCorrect() throws IOException {
try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
FileChannel channel = reader.getChannel();
ByteArrayOutputStream out = new ByteArrayOutputStream();) {
int bufferSize = 1024;
if (bufferSize > channel.size()) {
bufferSize = (int) channel.size();
}
ByteBuffer buff = ByteBuffer.allocate(bufferSize);
while (channel.read(buff) > 0) {
out.write(buff.array(), 0, buff.position());
buff.clear();
}
String fileContent = new String(out.toByteArray(), StandardCharsets.UTF_8);
assertEquals("Hello world", fileContent);
}
}
@Test
public void givenFile_whenReadWithFileChannelUsingFileInputStream_thenCorrect() throws IOException {
try (ByteArrayOutputStream out = new ByteArrayOutputStream();
FileInputStream fin = new FileInputStream("src/test/resources/test_read.in");
FileChannel channel = fin.getChannel();) {
int bufferSize = 1024;
if (bufferSize > channel.size()) {
bufferSize = (int) channel.size();
}
ByteBuffer buff = ByteBuffer.allocate(bufferSize);
while (channel.read(buff) > 0) {
out.write(buff.array(), 0, buff.position());
buff.clear();
}
String fileContent = new String(out.toByteArray(), StandardCharsets.UTF_8);
assertEquals("Hello world", fileContent);
}
}
@Test
public void givenFile_whenReadAFileSectionIntoMemoryWithFileChannel_thenCorrect() throws IOException {
try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
FileChannel channel = reader.getChannel();
ByteArrayOutputStream out = new ByteArrayOutputStream();) {
MappedByteBuffer buff = channel.map(FileChannel.MapMode.READ_ONLY, 6, 5);
if (buff.hasRemaining()) {
byte[] data = new byte[buff.remaining()];
buff.get(data);
assertEquals("world", new String(data, StandardCharsets.UTF_8));
}
}
}
@Test
public void whenWriteWithFileChannelUsingRandomAccessFile_thenCorrect() throws IOException {
String file = "src/test/resources/test_write_using_filechannel.txt";
try (RandomAccessFile writer = new RandomAccessFile(file, "rw");
FileChannel channel = writer.getChannel();) {
ByteBuffer buff = ByteBuffer.wrap("Hello world".getBytes(StandardCharsets.UTF_8));
channel.write(buff);
// now we verify whether the file was written correctly
RandomAccessFile reader = new RandomAccessFile(file, "r");
assertEquals("Hello world", reader.readLine());
reader.close();
}
}
@Test
public void givenFile_whenWriteAFileUsingLockAFileSectionWithFileChannel_thenCorrect() throws IOException {
try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "rw");
FileChannel channel = reader.getChannel();
FileLock fileLock = channel.tryLock(6, 5, Boolean.FALSE);) {
assertNotNull(fileLock);
}
}
@Test
public void givenFile_whenReadWithFileChannelGetPosition_thenCorrect() throws IOException {
try (ByteArrayOutputStream out = new ByteArrayOutputStream();
RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
FileChannel channel = reader.getChannel();) {
int bufferSize = 1024;
if (bufferSize > channel.size()) {
bufferSize = (int) channel.size();
}
ByteBuffer buff = ByteBuffer.allocate(bufferSize);
while (channel.read(buff) > 0) {
out.write(buff.array(), 0, buff.position());
buff.clear();
}
// the original file is 11 bytes long, so that's where the position pointer should be
assertEquals(11, channel.position());
channel.position(4);
assertEquals(4, channel.position());
}
}
@Test
public void whenGetFileSize_thenCorrect() throws IOException {
try (RandomAccessFile reader = new RandomAccessFile("src/test/resources/test_read.in", "r");
FileChannel channel = reader.getChannel();) {
// the original file is 11 bytes long, so that's where the position pointer should be
assertEquals(11, channel.size());
}
}
@Test
public void whenTruncateFile_thenCorrect() throws IOException {
String input = "this is a test input";
FileOutputStream fout = new FileOutputStream("src/test/resources/test_truncate.txt");
FileChannel channel = fout.getChannel();
ByteBuffer buff = ByteBuffer.wrap(input.getBytes());
channel.write(buff);
buff.flip();
channel = channel.truncate(5);
assertEquals(5, channel.size());
fout.close();
channel.close();
}
}

1
core-java-io/src/test/resources/test_truncate.txt Normal file
View File

@ -0,0 +1 @@
this

1
core-java-io/src/test/resources/test_write_using_filechannel.txt Normal file
View File

@ -0,0 +1 @@
Hello world

2
core-java-jvm/README.md
View File

@ -3,4 +3,4 @@
## Core Java JVM Cookbooks and Examples
### Relevant Articles:
- [Method Inlining in the JVM](http://www.baeldung.com/method-inlining-in-the-jvm/)
- [Method Inlining in the JVM](https://www.baeldung.com/jvm-method-inlining)

19
core-java-lambdas/pom.xml Normal file
View File

@ -0,0 +1,19 @@
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<artifactId>core-java-lambdas</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-java</relativePath>
</parent>
</project>

88
core-java-lambdas/src/main/java/com/baeldung/lambdas/LambdaVariables.java Normal file
View File

@ -0,0 +1,88 @@
package com.baeldung.lambdas;
import java.util.Random;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import java.util.function.Supplier;
import java.util.stream.IntStream;
/**
* Class with examples about working with capturing lambdas.
*/
public class LambdaVariables {
private volatile boolean run = true;
private int start = 0;
private ExecutorService executor = Executors.newFixedThreadPool(3);
public static void main(String[] args) {
new LambdaVariables().localVariableMultithreading();
}
Supplier<Integer> incrementer(int start) {
return () -> start; // can't modify start parameter inside the lambda
}
Supplier<Integer> incrementer() {
return () -> start++;
}
public void localVariableMultithreading() {
boolean run = true;
executor.execute(() -> {
while (run) {
// do operation
}
});
// commented because it doesn't compile, it's just an example of non-final local variables in lambdas
// run = false;
}
public void instanceVariableMultithreading() {
executor.execute(() -> {
while (run) {
// do operation
}
});
run = false;
}
/**
* WARNING: always avoid this workaround!!
*/
public void workaroundSingleThread() {
int[] holder = new int[] { 2 };
IntStream sums = IntStream
.of(1, 2, 3)
.map(val -> val + holder[0]);
holder[0] = 0;
System.out.println(sums.sum());
}
/**
* WARNING: always avoid this workaround!!
*/
public void workaroundMultithreading() {
int[] holder = new int[] { 2 };
Runnable runnable = () -> System.out.println(IntStream
.of(1, 2, 3)
.map(val -> val + holder[0])
.sum());
new Thread(runnable).start();
// simulating some processing
try {
Thread.sleep(new Random().nextInt(3) * 1000L);
} catch (InterruptedException e) {
throw new RuntimeException(e);
}
holder[0] = 0;
}
}

4
core-java-lang-oop-2/.gitignore vendored Normal file
View File

@ -0,0 +1,4 @@
target/
.idea/
bin/
*.iml

6
core-java-lang-oop-2/README.md Normal file
View File

@ -0,0 +1,6 @@
=========
## Core Java Lang OOP 2 Cookbooks and Examples
### Relevant Articles:
- [Generic Constructors in Java](https://www.baeldung.com/java-generic-constructors)

27
core-java-lang-oop-2/pom.xml Normal file
View File

@ -0,0 +1,27 @@
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.baeldung</groupId>
<artifactId>core-java-lang-oop-2</artifactId>
<version>0.1.0-SNAPSHOT</version>
<name>core-java-lang-oop-2</name>
<packaging>jar</packaging>
<parent>
<groupId>com.baeldung</groupId>
<artifactId>parent-java</artifactId>
<version>0.0.1-SNAPSHOT</version>
<relativePath>../parent-java</relativePath>
</parent>
<build>
<finalName>core-java-lang-oop-2</finalName>
<resources>
<resource>
<directory>src/main/resources</directory>
<filtering>true</filtering>
</resource>
</resources>
</build>
</project>

15
core-java-lang-oop-2/src/main/java/com/baeldung/anonymous/Book.java Normal file
View File

@ -0,0 +1,15 @@
package com.baeldung.anonymous;
public class Book {
final String title;
public Book(String title) {
this.title = title;
}
public String description() {
return "Title: " + title;
}
}

64
core-java-lang-oop-2/src/main/java/com/baeldung/anonymous/Main.java Normal file
View File

@ -0,0 +1,64 @@
package com.baeldung.anonymous;
import java.util.ArrayList;
import java.util.List;
/**
* Code snippet that illustrates the usage of anonymous classes.
*
* Note that use of Runnable instances in this example does not demonstrate their
* common use.
*
* @author A. Shcherbakov
*
*/
public class Main {
public static void main(String[] args) {
final List<Runnable> actions = new ArrayList<Runnable>(2);
Runnable action = new Runnable() {
@Override
public void run() {
System.out.println("Hello from runnable.");
}
};
actions.add(action);
Book book = new Book("Design Patterns") {
@Override
public String description() {
return "Famous GoF book.";
}
};
System.out.println(String.format("Title: %s, description: %s", book.title, book.description()));
actions.add(new Runnable() {
@Override
public void run() {
System.out.println("Hello from runnable #2.");
}
});
int count = 1;
Runnable action2 = new Runnable() {
static final int x = 0;
// static int y = 0;
@Override
public void run() {
System.out.println(String.format("Runnable with captured variables: count = %s, x = %s", count, x));
}
};
actions.add(action2);
for (Runnable a : actions) {
a.run();
}
}
}

38
core-java-lang-oop-2/src/main/java/com/baeldung/generics/Entry.java Normal file
View File

@ -0,0 +1,38 @@
package com.baeldung.generics;
import java.io.Serializable;
public class Entry {
private String data;
private int rank;
// non-generic constructor
public Entry(String data, int rank) {
this.data = data;
this.rank = rank;
}
// generic constructor
public <E extends Rankable & Serializable> Entry(E element) {
this.data = element.toString();
this.rank = element.getRank();
}
// getters and setters
public String getData() {
return data;
}
public void setData(String data) {
this.data = data;
}
public int getRank() {
return rank;
}
public void setRank(int rank) {
this.rank = rank;
}
}

53
core-java-lang-oop-2/src/main/java/com/baeldung/generics/GenericEntry.java Normal file
View File

@ -0,0 +1,53 @@
package com.baeldung.generics;
import java.io.Serializable;
import java.util.Optional;
public class GenericEntry<T> {
private T data;
private int rank;
// non-generic constructor
public GenericEntry(int rank) {
this.rank = rank;
}
// generic constructor
public GenericEntry(T data, int rank) {
this.data = data;
this.rank = rank;
}
// generic constructor with different type
public <E extends Rankable & Serializable> GenericEntry(E element) {
this.data = (T) element;
this.rank = element.getRank();
}
// generic constructor with different type and wild card
public GenericEntry(Optional<? extends Rankable> optional) {
if (optional.isPresent()) {
this.data = (T) optional.get();
this.rank = optional.get()
.getRank();
}
}
// getters and setters
public T getData() {
return data;
}
public void setData(T data) {
this.data = data;
}
public int getRank() {
return rank;
}
public void setRank(int rank) {
this.rank = rank;
}
}

34
core-java-lang-oop-2/src/main/java/com/baeldung/generics/MapEntry.java Normal file
View File

@ -0,0 +1,34 @@
package com.baeldung.generics;
public class MapEntry<K, V> {
private K key;
private V value;
public MapEntry() {
super();
}
// generic constructor with two parameters
public MapEntry(K key, V value) {
this.key = key;
this.value = value;
}
// getters and setters
public K getKey() {
return key;
}
public void setKey(K key) {
this.key = key;
}
public V getValue() {
return value;
}
public void setValue(V value) {
this.value = value;
}
}

50
core-java-lang-oop-2/src/main/java/com/baeldung/generics/Product.java Normal file
View File

@ -0,0 +1,50 @@
package com.baeldung.generics;
import java.io.Serializable;
public class Product implements Rankable, Serializable {
private String name;
private double price;
private int sales;
public Product(String name, double price) {
this.name = name;
this.price = price;
}
@Override
public int getRank() {
return sales;
}
@Override
public String toString() {
return "Product [name=" + name + ", price=" + price + ", sales=" + sales + "]";
}
// getters and setters
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public double getPrice() {
return price;
}
public void setPrice(double price) {
this.price = price;
}
public int getSales() {
return sales;
}
public void setSales(int sales) {
this.sales = sales;
}
}

5
core-java-lang-oop-2/src/main/java/com/baeldung/generics/Rankable.java Normal file
View File

@ -0,0 +1,5 @@
package com.baeldung.generics;
public interface Rankable {
public int getRank();
}

16
core-java-lang-oop-2/src/main/java/com/baeldung/supertypecompilerexception/MyClass.java Normal file
View File

@ -0,0 +1,16 @@
package com.baeldung.supertypecompilerexception;
public class MyClass {
private int myField1 = 10;
private int myField2;
public MyClass() {
//uncomment this to see the supertype compiler error:
//this(myField1);
}
public MyClass(int i) {
myField2 = i;
}
}

15
core-java-lang-oop-2/src/main/java/com/baeldung/supertypecompilerexception/MyClassSolution1.java Normal file
View File

@ -0,0 +1,15 @@
package com.baeldung.supertypecompilerexception;
public class MyClassSolution1 {
private int myField1 = 10;
private int myField2;
public MyClassSolution1() {
myField2 = myField1;
}
public MyClassSolution1(int i) {
myField2 = i;
}
}

19
core-java-lang-oop-2/src/main/java/com/baeldung/supertypecompilerexception/MyClassSolution2.java Normal file
View File

@ -0,0 +1,19 @@
package com.baeldung.supertypecompilerexception;
public class MyClassSolution2 {
private int myField1 = 10;
private int myField2;
public MyClassSolution2() {
setupMyFields(myField1);
}
public MyClassSolution2(int i) {
setupMyFields(i);
}
private void setupMyFields(int i) {
myField2 = i;
}
}

15
core-java-lang-oop-2/src/main/java/com/baeldung/supertypecompilerexception/MyClassSolution3.java Normal file
View File

@ -0,0 +1,15 @@
package com.baeldung.supertypecompilerexception;
public class MyClassSolution3 {
private static final int SOME_CONSTANT = 10;
private int myField2;
public MyClassSolution3() {
this(SOME_CONSTANT);
}
public MyClassSolution3(int i) {
myField2 = i;
}
}

14
core-java-lang-oop-2/src/main/java/com/baeldung/supertypecompilerexception/MyException.java Normal file
View File

@ -0,0 +1,14 @@
package com.baeldung.supertypecompilerexception;
public class MyException extends RuntimeException {
private int errorCode = 0;
public MyException(String message) {
//uncomment this to see the supertype compiler error:
//super(message + getErrorCode());
}
public int getErrorCode() {
return errorCode;
}
}

76
core-java-lang-oop-2/src/test/java/com/baeldung/generics/GenericConstructorUnitTest.java Normal file
View File

@ -0,0 +1,76 @@
package com.baeldung.generics;
import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNull;
import java.io.Serializable;
import java.util.Optional;
import org.junit.Test;
public class GenericConstructorUnitTest {
@Test
public void givenNonGenericConstructor_whenCreateNonGenericEntry_thenOK() {
Entry entry = new Entry("sample", 1);
assertEquals("sample", entry.getData());
assertEquals(1, entry.getRank());
}
@Test
public void givenGenericConstructor_whenCreateNonGenericEntry_thenOK() {
Product product = new Product("milk", 2.5);
product.setSales(30);
Entry entry = new Entry(product);
assertEquals(product.toString(), entry.getData());
assertEquals(30, entry.getRank());
}
@Test
public void givenNonGenericConstructor_whenCreateGenericEntry_thenOK() {
GenericEntry<String> entry = new GenericEntry<String>(1);
assertNull(entry.getData());
assertEquals(1, entry.getRank());
}
@Test
public void givenGenericConstructor_whenCreateGenericEntry_thenOK() {
GenericEntry<String> entry = new GenericEntry<String>("sample", 1);
assertEquals("sample", entry.getData());
assertEquals(1, entry.getRank());
}
@Test
public void givenGenericConstructorWithDifferentType_whenCreateGenericEntry_thenOK() {
Product product = new Product("milk", 2.5);
product.setSales(30);
GenericEntry<Serializable> entry = new GenericEntry<Serializable>(product);
assertEquals(product, entry.getData());
assertEquals(30, entry.getRank());
}
@Test
public void givenGenericConstructorWithWildCard_whenCreateGenericEntry_thenOK() {
Product product = new Product("milk", 2.5);
product.setSales(30);
Optional<Product> optional = Optional.of(product);
GenericEntry<Serializable> entry = new GenericEntry<Serializable>(optional);
assertEquals(product, entry.getData());
assertEquals(30, entry.getRank());
}
@Test
public void givenGenericConstructor_whenCreateGenericEntryWithTwoTypes_thenOK() {
MapEntry<String, Integer> entry = new MapEntry<String, Integer>("sample", 1);
assertEquals("sample", entry.getKey());
assertEquals(1, entry.getValue()
.intValue());
}
}

2
core-java-lang-oop/README.md
View File

@ -10,7 +10,7 @@
- [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)
- [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)

2
core-java-lang/README.md
View File

@ -12,7 +12,7 @@
- [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 the Diamond Operator in Java](http://www.baeldung.com/java-diamond-operator)
- [Quick Example - Comparator vs Comparable in Java](http://www.baeldung.com/java-comparator-comparable)
- [Comparator and Comparable in Java](http://www.baeldung.com/java-comparator-comparable)
- [The Java continue and break Keywords](http://www.baeldung.com/java-continue-and-break)
- [Nested Classes in Java](http://www.baeldung.com/java-nested-classes)
- [A Guide to Inner Interfaces in Java](http://www.baeldung.com/java-inner-interfaces)

1
core-java-networking/README.md
View File

@ -15,3 +15,4 @@
- [Guide to Java URL Encoding/Decoding](http://www.baeldung.com/java-url-encoding-decoding)
- [Do a Simple HTTP Request in Java](http://www.baeldung.com/java-http-request)
- [Difference between URL and URI](http://www.baeldung.com/java-url-vs-uri)
- [Read an InputStream using the Java Server Socket](https://www.baeldung.com/java-inputstream-server-socket)

4
core-java-networking/src/main/java/com/baeldung/networking/cookies/ProxyAcceptCookiePolicy.java
View File

@ -17,8 +17,8 @@ public class ProxyAcceptCookiePolicy implements CookiePolicy {
host = uri.getHost();
}
if (!HttpCookie.domainMatches(acceptedProxy, host)) {
return false;
if (HttpCookie.domainMatches(acceptedProxy, host)) {
return true;
}
return CookiePolicy.ACCEPT_ORIGINAL_SERVER.shouldAccept(uri, cookie);

2
core-java-os/README.md
View File

@ -6,3 +6,5 @@ This module uses Java 9, so make sure to have the JDK 9 installed to run it.
### Relevant Articles:
- [Java 9 Process API Improvements](http://www.baeldung.com/java-9-process-api)
- [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)
- [Guide to java.lang.ProcessBuilder API](https://www.baeldung.com/java-lang-processbuilder-api)

3
core-java/README.md
View File

@ -29,7 +29,7 @@
- [What is the serialVersionUID?](http://www.baeldung.com/java-serial-version-uid)
- [A Guide to the ResourceBundle](http://www.baeldung.com/java-resourcebundle)
- [Class Loaders in Java](http://www.baeldung.com/java-classloaders)
- [Guide to Java Clock Class](http://www.baeldung.com/java-clock)
- [Guide to the Java Clock Class](http://www.baeldung.com/java-clock)
- [Importance of Main Manifest Attribute in a Self-Executing JAR](http://www.baeldung.com/java-jar-executable-manifest-main-class)
- [Java Global Exception Handler](http://www.baeldung.com/java-global-exception-handler)
- [How to Get the Size of an Object in Java](http://www.baeldung.com/java-size-of-object)
@ -50,3 +50,4 @@
- [Finding Leap Years in Java](https://www.baeldung.com/java-leap-year)
- [Java Bitwise Operators](https://www.baeldung.com/java-bitwise-operators)
- [Guide to Creating and Running a Jar File in Java](https://www.baeldung.com/java-create-jar)
- [Making a JSON POST Request With HttpURLConnection](https://www.baeldung.com/httpurlconnection-post)

5
core-kotlin-2/README.md
View File

@ -2,5 +2,8 @@
- [Void Type in Kotlin](https://www.baeldung.com/kotlin-void-type)
- [How to use Kotlin Range Expressions](https://www.baeldung.com/kotlin-ranges)
- [Creating a Kotlin Range Iterator on a Custom Object](https://www.baeldung.com/kotlin-custom-range-iterator)
- [Kotlin Scope Functions](https://www.baeldung.com/kotlin-scope-functions)
- [Kotlin Annotations](https://www.baeldung.com/kotlin-annotations)
- [Split a List into Parts in Kotlin](https://www.baeldung.com/kotlin-split-list-into-parts)
- [String Comparison in Kotlin](https://www.baeldung.com/kotlin-string-comparison)

20
core-kotlin-2/build.gradle
View File

@ -5,7 +5,7 @@ version '1.0-SNAPSHOT'
buildscript {
ext.kotlin_version = '1.2.41'
ext.kotlin_version = '1.3.30'
repositories {
mavenCentral()
@ -26,8 +26,6 @@ sourceCompatibility = 1.8
compileKotlin { kotlinOptions.jvmTarget = "1.8" }
compileTestKotlin { kotlinOptions.jvmTarget = "1.8" }
kotlin { experimental { coroutines "enable" } }
repositories {
mavenCentral()
jcenter()
@ -39,10 +37,22 @@ sourceSets {
srcDirs 'com/baeldung/ktor'
}
}
}
test {
useJUnitPlatform()
testLogging {
events "passed", "skipped", "failed"
}
}
dependencies {
compile "ch.qos.logback:logback-classic:1.2.1"
testCompile group: 'junit', name: 'junit', version: '4.12'
implementation "ch.qos.logback:logback-classic:1.2.1"
implementation "org.jetbrains.kotlin:kotlin-stdlib:${kotlin_version}"
testImplementation 'org.junit.jupiter:junit-jupiter:5.4.2'
testImplementation 'junit:junit:4.12'
testImplementation 'org.assertj:assertj-core:3.12.2'
testImplementation 'org.mockito:mockito-core:2.27.0'
testImplementation "org.jetbrains.kotlin:kotlin-test:${kotlin_version}"
testImplementation "org.jetbrains.kotlin:kotlin-test-junit5:${kotlin_version}"
}

BIN
core-kotlin-2/gradle/wrapper/gradle-wrapper.jar vendored
View File

Binary file not shown.

2
core-kotlin-2/gradle/wrapper/gradle-wrapper.properties vendored
View File

@ -1,5 +1,5 @@
distributionBase=GRADLE_USER_HOME
distributionPath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-5.4-bin.zip
zipStoreBase=GRADLE_USER_HOME
zipStorePath=wrapper/dists
distributionUrl=https\://services.gradle.org/distributions/gradle-4.4-bin.zip

18
core-kotlin-2/gradlew vendored
View File

@ -1,5 +1,21 @@
#!/usr/bin/env sh
#
# Copyright 2015 the original author or authors.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
##############################################################################
##
## Gradle start up script for UN*X
@ -28,7 +44,7 @@ APP_NAME="Gradle"
APP_BASE_NAME=`basename "$0"`
# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
DEFAULT_JVM_OPTS=""
DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
# Use the maximum available, or set MAX_FD != -1 to use that value.
MAX_FD="maximum"

18
core-kotlin-2/gradlew.bat vendored
View File

@ -1,3 +1,19 @@
@rem
@rem Copyright 2015 the original author or authors.
@rem
@rem Licensed under the Apache License, Version 2.0 (the "License");
@rem you may not use this file except in compliance with the License.
@rem You may obtain a copy of the License at
@rem
@rem http://www.apache.org/licenses/LICENSE-2.0
@rem
@rem Unless required by applicable law or agreed to in writing, software
@rem distributed under the License is distributed on an "AS IS" BASIS,
@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
@rem See the License for the specific language governing permissions and
@rem limitations under the License.
@rem
@if "%DEBUG%" == "" @echo off
@rem ##########################################################################
@rem
@ -14,7 +30,7 @@ set APP_BASE_NAME=%~n0
set APP_HOME=%DIRNAME%
@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS=
set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"
@rem Find java.exe
if defined JAVA_HOME goto findJavaFromJavaHome

81
core-kotlin-2/pom.xml
View File

@ -13,4 +13,85 @@
<relativePath>../parent-kotlin</relativePath>
</parent>
<dependencies>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-stdlib-jdk8</artifactId>
<version>${kotlin.version}</version>
</dependency>
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter</artifactId>
<version>${junit.jupiter.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.mockito</groupId>
<artifactId>mockito-core</artifactId>
<version>${mockito.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>net.bytebuddy</groupId>
<artifactId>byte-buddy</artifactId>
<version>${byte-buddy.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.assertj</groupId>
<artifactId>assertj-core</artifactId>
<version>${assertj.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-test</artifactId>
<version>${kotlin.version}</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-test-junit5</artifactId>
<version>${kotlin.version}</version>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.jetbrains.kotlin</groupId>
<artifactId>kotlin-maven-plugin</artifactId>
<version>${kotlin.version}</version>
<executions>
<execution>
<id>compile</id>
<phase>compile</phase>
<goals>
<goal>compile</goal>
</goals>
</execution>
<execution>
<id>test-compile</id>
<phase>test-compile</phase>
<goals>
<goal>test-compile</goal>
</goals>
</execution>
</executions>
<configuration>
<jvmTarget>1.8</jvmTarget>
</configuration>
</plugin>
</plugins>
</build>
<properties>
<kotlin.version>1.3.30</kotlin.version>
<junit.jupiter.version>5.4.2</junit.jupiter.version>
<mockito.version>2.27.0</mockito.version>
<byte-buddy.version>1.9.12</byte-buddy.version>
<assertj.version>3.10.0</assertj.version>
</properties>
</project>

13
core-kotlin-2/src/main/kotlin/com/baeldung/range/CharRange.kt Normal file
View File

@ -0,0 +1,13 @@
package com.baeldung.range
fun main(args: Array<String>) {
for (ch in 'a'..'f') {
print(ch)
}
println()
for (ch in 'f' downTo 'a') {
print(ch)
}
}

21
core-kotlin-2/src/main/kotlin/com/baeldung/range/Color.kt Normal file
View File

@ -0,0 +1,21 @@
package com.baeldung.range
enum class Color(val rgb: Int) {
BLUE(0x0000FF),
GREEN(0x008000),
RED(0xFF0000),
MAGENTA(0xFF00FF),
YELLOW(0xFFFF00);
}
fun main(args: Array<String>) {
println(Color.values().toList());
val red = Color.RED
val yellow = Color.YELLOW
val range = red..yellow
println(range.contains(Color.MAGENTA))
println(range.contains(Color.BLUE))
println(range.contains(Color.GREEN))
}

18
core-kotlin-2/src/main/kotlin/com/baeldung/range/Filter.kt Normal file
View File

@ -0,0 +1,18 @@
package com.baeldung.range
fun main(args: Array<String>) {
val r = 1..10
//Apply filter
val f = r.filter { it -> it % 2 == 0 }
println(f)
//Map
val m = r.map { it -> it * it }
println(m)
//Reduce
val rdc = r.reduce { a, b -> a + b }
println(rdc)
}

8
core-kotlin-2/src/main/kotlin/com/baeldung/range/FirstLast.kt Normal file
View File

@ -0,0 +1,8 @@
package com.baeldung.range
fun main(args: Array<String>) {
println((1..9).first)
println((1..9 step 2).step)
println((3..9).reversed().last)
}

14
core-kotlin-2/src/main/kotlin/com/baeldung/range/OtherRangeFunctions.kt Normal file
View File

@ -0,0 +1,14 @@
package com.baeldung.range
fun main(args: Array<String>) {
val r = 1..20
println(r.min())
println(r.max())
println(r.sum())
println(r.average())
println(r.count())
val repeated = listOf(1, 1, 2, 4, 4, 6, 10)
println(repeated.distinct())
}

28
core-kotlin-2/src/main/kotlin/com/baeldung/range/Range.kt Normal file
View File

@ -0,0 +1,28 @@
package com.baeldung.range
fun main(args: Array<String>) {
for (i in 1..9) {
print(i)
}
println()
for (i in 9 downTo 1) {
print(i)
}
println()
for (i in 1.rangeTo(9)) {
print(i)
}
println()
for (i in 9.downTo(1)) {
print(i)
}
println()
for (i in 1 until 9) {
print(i)
}
}

Some files were not shown because too many files have changed in this diff Show More