Merge pull request #5985 from amit2103/BAEL-10838

[BAEL-10838] - Created core-java-lang-syntax module
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Loredana Crusoveanu 2018-12-25 15:15:17 +02:00 committed by GitHub
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45 changed files with 189 additions and 7 deletions

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core-java-lang-syntax/.gitignore vendored Normal file
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*.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

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=========
## 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)

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<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>

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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;
}
}

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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);
}
}

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### 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)

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<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>