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[JAVA-621] core-java-lang-oop-modifiers module

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* Creation

* Moved code from https://www.baeldung.com/java-static

* Moved code from https://www.baeldung.com/java-final

* Moved code from https://www.baeldung.com/java-public-keyword

* Moved code from https://www.baeldung.com/java-access-modifiers

* Moved code from https://www.baeldung.com/java-private-keyword

* Moved code from https://www.baeldung.com/java-static-default-methods

* Moved code from https://www.baeldung.com/java-strictfp

* Moved article references to the new README.md
This commit is contained in:
dupirefr
2020-04-04 09:42:08 +02:00
parent 6baffe791f
commit c182eaca8b
40 changed files with 52 additions and 12 deletions
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2
core-java-modules/core-java-lang-oop/README.md
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@@ -4,13 +4,11 @@ This module contains articles about Object-oriented programming (OOP) in Java
### Relevant Articles:
- [Guide to hashCode() in Java](https://www.baeldung.com/java-hashcode)
- [A Guide to the Static Keyword in Java](https://www.baeldung.com/java-static)
- [Polymorphism in Java](https://www.baeldung.com/java-polymorphism)
- [Method Overloading and Overriding in Java](https://www.baeldung.com/java-method-overload-override)
- [How to Make a Deep Copy of an Object in Java](https://www.baeldung.com/java-deep-copy)
- [Guide to Inheritance in Java](https://www.baeldung.com/java-inheritance)
- [Object Type Casting in Java](https://www.baeldung.com/java-type-casting)
- [The “final” Keyword in Java](https://www.baeldung.com/java-final)
- [Type Erasure in Java Explained](https://www.baeldung.com/java-type-erasure)
- [Variable and Method Hiding in Java](https://www.baeldung.com/java-variable-method-hiding)
- [Object-Oriented-Programming Concepts in Java](https://www.baeldung.com/java-oop)

5
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/BlackCat.java
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@@ -1,5 +0,0 @@
package com.baeldung.finalkeyword;
public class BlackCat {
}

6
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/BlackDog.java
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@@ -1,6 +0,0 @@
package com.baeldung.finalkeyword;
public class BlackDog extends Dog {
// public void sound() {
// }
}

18
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/Cat.java
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@@ -1,18 +0,0 @@
package com.baeldung.finalkeyword;
public final class Cat {
private int weight;
public int getWeight() {
return weight;
}
public void setWeight(int weight) {
this.weight = weight;
}
public void methodWithFinalArguments(final int x) {
// x=1;
}
}

7
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/finalkeyword/Dog.java
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@@ -1,7 +0,0 @@
package com.baeldung.finalkeyword;
public class Dog {
public final void sound() {
}
}

48
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/staticdemo/Car.java
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@@ -1,48 +0,0 @@
package com.baeldung.staticdemo;
/**
* This class demonstrates the use of static fields and static methods
* the instance variables engine and displacement are distinct for
* each and every object whereas static/class variable numberOfCars
* is unique and is shared across all objects of this class.
*
* @author baeldung
*
*/
public class Car {
private String name;
private String engine;
public static int numberOfCars;
public Car(String name, String engine) {
this.name = name;
this.engine = engine;
numberOfCars++;
}
//getters and setters
public static int getNumberOfCars() {
return numberOfCars;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getEngine() {
return engine;
}
public void setEngine(String engine) {
this.engine = engine;
}
public static void setNumberOfCars(int numberOfCars) {
Car.numberOfCars = numberOfCars;
}
}

13
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/staticdemo/Singleton.java
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@@ -1,13 +0,0 @@
package com.baeldung.staticdemo;
public class Singleton {
private Singleton() {}
private static class SingletonHolder {
public static final Singleton instance = new Singleton();
}
public static Singleton getInstance() {
return SingletonHolder.instance;
}
}

28
core-java-modules/core-java-lang-oop/src/main/java/com/baeldung/staticdemo/StaticBlock.java
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@@ -1,28 +0,0 @@
package com.baeldung.staticdemo;
import java.util.LinkedList;
import java.util.List;
public class StaticBlock {
private static List<String> ranks = new LinkedList<>();
static {
ranks.add("Lieutenant");
ranks.add("Captain");
ranks.add("Major");
}
static {
ranks.add("Colonel");
ranks.add("General");
}
//getters and setters
public static List<String> getRanks() {
return ranks;
}
public static void setRanks(List<String> ranks) {
StaticBlock.ranks = ranks;
}
}

33
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/finalkeyword/FinalUnitTest.java
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@@ -1,33 +0,0 @@
package com.baeldung.finalkeyword;
import org.junit.Test;
import static org.junit.Assert.*;
public class FinalUnitTest {
@Test
public void whenChangedFinalClassProperties_thenChanged() {
Cat cat = new Cat();
cat.setWeight(1);
assertEquals(1, cat.getWeight());
}
@Test
public void whenFinalVariableAssign_thenOnlyOnce() {
final int i;
i = 1;
// i=2;
}
@Test
public void whenChangedFinalReference_thenChanged() {
final Cat cat = new Cat();
// cat=new Cat();
cat.setWeight(5);
assertEquals(5, cat.getWeight());
}
}

14
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/staticdemo/CarIntegrationTest.java
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@@ -1,14 +0,0 @@
package com.baeldung.staticdemo;
import static org.junit.Assert.*;
import org.junit.Test;
public class CarIntegrationTest {
@Test
public void whenNumberOfCarObjectsInitialized_thenStaticCounterIncreases() {
new Car("Jaguar", "V8");
new Car("Bugatti", "W16");
assertEquals(2, Car.numberOfCars);
}
}

15
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/staticdemo/SingletonIntegrationTest.java
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@@ -1,15 +0,0 @@
package com.baeldung.staticdemo;
import org.junit.Assert;
import org.junit.Test;
public class SingletonIntegrationTest {
@Test
public void givenStaticInnerClass_whenMultipleTimesInstanceCalled_thenOnlyOneTimeInitialized() {
Singleton object1 = Singleton.getInstance();
Singleton object2 = Singleton.getInstance();
Assert.assertSame(object1, object2);
}
}

17
core-java-modules/core-java-lang-oop/src/test/java/com/baeldung/staticdemo/StaticBlockIntegrationTest.java
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@@ -1,17 +0,0 @@
package com.baeldung.staticdemo;
import static org.hamcrest.collection.IsIterableContainingInOrder.contains;
import static org.junit.Assert.assertThat;
import java.util.List;
import org.junit.Test;
public class StaticBlockIntegrationTest {
@Test
public void whenAddedListElementsThroughStaticBlock_thenEnsureCorrectOrder() {
List<String> actualList = StaticBlock.getRanks();
assertThat(actualList, contains("Lieutenant", "Captain", "Major", "Colonel", "General"));
}
}