Merge pull request #5985 from amit2103/BAEL-10838

[BAEL-10838] - Created core-java-lang-syntax module

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

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)

core-java-lang-syntax/pom.xml

@@ -0,0 +1,53 @@
+<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-syntax</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <packaging>jar</packaging>
+    <name>core-java-lang-syntax</name>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        <!-- logging -->
+        <dependency>
+            <groupId>log4j</groupId>
+            <artifactId>log4j</artifactId>
+            <version>${log4j.version}</version>
+        </dependency>
+        <dependency> <!-- needed to bridge to slf4j for projects that use the log4j APIs directly -->
+            <groupId>org.slf4j</groupId>
+            <artifactId>log4j-over-slf4j</artifactId>
+            <version>${org.slf4j.version}</version>
+        </dependency>
+        <!-- test scoped -->
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj-core.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-lang-syntax</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
+
+    <properties>
+        <!-- testing -->
+        <assertj-core.version>3.10.0</assertj-core.version>
+    </properties>
+
+</project>

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;
+    }
+
+}
+

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);
+    }
+}

core-java-lang/README.md

@@ -4,10 +4,8 @@
 
 ### 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)
@@ -17,8 +15,6 @@
 - [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)
 - [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)
 - [Recursion In Java](http://www.baeldung.com/java-recursion)
 - [A Guide to the finalize Method in Java](http://www.baeldung.com/java-finalize)
@@ -34,9 +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)
 - [Retrieving a Class Name in Java](https://www.baeldung.com/java-class-name)

pom.xml

@@ -381,6 +381,7 @@
                 <module>core-java-collections</module>
                 <module>core-java-concurrency-collections</module>
                 <module>core-java-io</module>
+                <module>core-java-lang-syntax</module>
                 <module>core-java-lang</module>
                 <module>core-java-lang-oop</module>
 				<module>core-java-networking</module>
@@ -1089,6 +1090,7 @@
                 <module>core-java-collections</module>
                 <module>core-java-concurrency-collections</module>
                 <module>core-java-io</module>
+                <module>core-java-lang-syntax</module>
                 <module>core-java-lang</module>
                 <module>core-java-lang-oop</module>
                 <module>core-java-networking</module>