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move design patterns to new module (#4206)

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* move design patterns to new module

* fix logger import
This commit is contained in:
Loredana Crusoveanu
2018-05-11 10:11:13 +03:00
committed by Grzegorz Piwowarek
parent 4a08fd1352
commit 537c1d1150
137 changed files with 200 additions and 214 deletions
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20
core-java/src/main/java/com/baeldung/designpatterns/adapter/AdapterPatternDriver.java
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package com.baeldung.designpatterns.adapter;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;
public class AdapterPatternDriver {
public static void main(String args[]) {
Movable bugattiVeyron = new BugattiVeyron();
MovableAdapter bugattiVeyronAdapter = new MovableAdapterImpl(bugattiVeyron);
LOG.info("Bugatti Veyron Super Sport's top speed is " + bugattiVeyronAdapter.getSpeed() + " Kmph.");
Movable mcLaren = new McLaren();
MovableAdapter mcLarenAdapter = new MovableAdapterImpl(mcLaren);
LOG.info("McLaren F1 top speed is " + mcLarenAdapter.getSpeed() + " Kmph.");
Movable astonMartin = new AstonMartin();
MovableAdapter astonMartinAdapter = new MovableAdapterImpl(astonMartin);
LOG.info("McLaren F1 top speed is " + astonMartinAdapter.getSpeed() + " Kmph.");
}
}

8
core-java/src/main/java/com/baeldung/designpatterns/adapter/AstonMartin.java
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@@ -1,8 +0,0 @@
package com.baeldung.designpatterns.adapter;
public class AstonMartin implements Movable {
@Override
public double getSpeed() {
return 220;
}
}

8
core-java/src/main/java/com/baeldung/designpatterns/adapter/BugattiVeyron.java
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@@ -1,8 +0,0 @@
package com.baeldung.designpatterns.adapter;
public class BugattiVeyron implements Movable {
@Override
public double getSpeed() {
return 268;
}
}

8
core-java/src/main/java/com/baeldung/designpatterns/adapter/McLaren.java
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@@ -1,8 +0,0 @@
package com.baeldung.designpatterns.adapter;
public class McLaren implements Movable {
@Override
public double getSpeed() {
return 241;
}
}

6
core-java/src/main/java/com/baeldung/designpatterns/adapter/Movable.java
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@@ -1,6 +0,0 @@
package com.baeldung.designpatterns.adapter;
public interface Movable {
// returns speed in MPH
double getSpeed();
}

6
core-java/src/main/java/com/baeldung/designpatterns/adapter/MovableAdapter.java
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@@ -1,6 +0,0 @@
package com.baeldung.designpatterns.adapter;
public interface MovableAdapter {
// returns speed in KMPH
double getSpeed();
}

19
core-java/src/main/java/com/baeldung/designpatterns/adapter/MovableAdapterImpl.java
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@@ -1,19 +0,0 @@
package com.baeldung.designpatterns.adapter;
public class MovableAdapterImpl implements MovableAdapter {
private Movable luxuryCars;
public MovableAdapterImpl(Movable luxuryCars) {
this.luxuryCars = luxuryCars;
}
@Override
public double getSpeed() {
double mph = luxuryCars.getSpeed();
return convertMPHtoKMPH(mph);
}
private double convertMPHtoKMPH(double mph) {
return mph * 1.60934;
}
}

8
core-java/src/main/java/com/baeldung/designpatterns/bridge/Blue.java
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@@ -1,8 +0,0 @@
package com.baeldung.designpatterns.bridge;
public class Blue implements Color {
@Override
public String fill() {
return "Color is Blue";
}
}

14
core-java/src/main/java/com/baeldung/designpatterns/bridge/BridgePatternDriver.java
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@@ -1,14 +0,0 @@
package com.baeldung.designpatterns.bridge;
public class BridgePatternDriver {
public static void main(String[] args) {
//a square with red color
Shape square = new Square(new Red());
System.out.println(square.draw());
//a triangle with blue color
Shape triangle = new Triangle(new Blue());
System.out.println(triangle.draw());
}
}

5
core-java/src/main/java/com/baeldung/designpatterns/bridge/Color.java
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@@ -1,5 +0,0 @@
package com.baeldung.designpatterns.bridge;
public interface Color {
String fill();
}

10
core-java/src/main/java/com/baeldung/designpatterns/bridge/Red.java
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@@ -1,10 +0,0 @@
package com.baeldung.designpatterns.bridge;
public class Red implements Color {
@Override
public String fill() {
return "Color is Red";
}
}

11
core-java/src/main/java/com/baeldung/designpatterns/bridge/Shape.java
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@@ -1,11 +0,0 @@
package com.baeldung.designpatterns.bridge;
public abstract class Shape {
protected Color color;
public Shape(Color color) {
this.color = color;
}
abstract public String draw();
}

13
core-java/src/main/java/com/baeldung/designpatterns/bridge/Square.java
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@@ -1,13 +0,0 @@
package com.baeldung.designpatterns.bridge;
public class Square extends Shape {
public Square(Color color) {
super(color);
}
@Override
public String draw() {
return "Square drawn. " + color.fill();
}
}

13
core-java/src/main/java/com/baeldung/designpatterns/bridge/Triangle.java
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@@ -1,13 +0,0 @@
package com.baeldung.designpatterns.bridge;
public class Triangle extends Shape {
public Triangle(Color color) {
super(color);
}
@Override
public String draw() {
return "Triangle drawn. "+ color.fill();
}
}

19
core-java/src/main/java/com/baeldung/designpatterns/composite/CompositeDemo.java
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@@ -1,19 +0,0 @@
package com.baeldung.designpatterns.composite;
/**
* Created by Gebruiker on 5/3/2018.
*/
public class CompositeDemo {
public static void main(String args[]) {
Department salesDepartment = new SalesDepartment(1, "Sales department");
Department financialDepartment = new FinancialDepartment(2, "Financial department");
HeadDepartment headDepartment = new HeadDepartment(3, "Head department");
headDepartment.addDepartMent(salesDepartment);
headDepartment.addDepartMent(financialDepartment);
headDepartment.printDepartmentName();
}
}

9
core-java/src/main/java/com/baeldung/designpatterns/composite/Department.java
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@@ -1,9 +0,0 @@
package com.baeldung.designpatterns.composite;
/**
* Created by Gebruiker on 5/1/2018.
*/
public interface Department {
void printDepartmentName();
}

35
core-java/src/main/java/com/baeldung/designpatterns/composite/FinancialDepartment.java
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@@ -1,35 +0,0 @@
package com.baeldung.designpatterns.composite;
/**
* Created by Gebruiker on 5/1/2018.
*/
public class FinancialDepartment implements Department {
private Integer id;
private String name;
public FinancialDepartment(Integer id, String name) {
this.id = id;
this.name = name;
}
public void printDepartmentName() {
System.out.println(getClass().getSimpleName());
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

33
core-java/src/main/java/com/baeldung/designpatterns/composite/HeadDepartment.java
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@@ -1,33 +0,0 @@
package com.baeldung.designpatterns.composite;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Gebruiker on 5/1/2018.
*/
public class HeadDepartment implements Department {
private Integer id;
private String name;
private List<Department> childDepartments;
public HeadDepartment(Integer id, String name) {
this.id = id;
this.name = name;
this.childDepartments = new ArrayList<Department>();
}
public void printDepartmentName() {
childDepartments.forEach(Department::printDepartmentName);
}
public void addDepartMent(Department department) {
childDepartments.add(department);
}
public void removeDepartment(Department department) {
childDepartments.remove(department);
}
}

35
core-java/src/main/java/com/baeldung/designpatterns/composite/SalesDepartment.java
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@@ -1,35 +0,0 @@
package com.baeldung.designpatterns.composite;
/**
* Created by Gebruiker on 5/1/2018.
*/
public class SalesDepartment implements Department {
private Integer id;
private String name;
public SalesDepartment(Integer id, String name) {
this.id = id;
this.name = name;
}
public void printDepartmentName() {
System.out.println(getClass().getSimpleName());
}
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

6
core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/AbstractFactory.java
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@@ -1,6 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
public interface AbstractFactory {
Animal getAnimal(String toyType) ;
Color getColor(String colorType);
}

18
core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/AbstractPatternDriver.java
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@@ -1,18 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
public class AbstractPatternDriver {
public static void main(String[] args) {
AbstractFactory abstractFactory;
//creating a brown toy dog
abstractFactory = FactoryProvider.getFactory("Toy");
Animal toy = abstractFactory.getAnimal("Dog");
abstractFactory = FactoryProvider.getFactory("Color");
Color color = abstractFactory.getColor("Brown");
String result = "A " + toy.getType() + " with " + color.getColor() + " color " + toy.makeSound();
System.out.println(result);
}
}

6
core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/Animal.java
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@@ -1,6 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
public interface Animal {
String getType();
String makeSound();
}

21
core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/AnimalFactory.java
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@@ -1,21 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
public class AnimalFactory implements AbstractFactory {
@Override
public Animal getAnimal(String animalType) {
if ("Dog".equalsIgnoreCase(animalType)) {
return new Dog();
} else if ("Duck".equalsIgnoreCase(animalType)) {
return new Duck();
}
return null;
}
@Override
public Color getColor(String color) {
throw new UnsupportedOperationException();
}
}

10
core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/Brown.java
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@@ -1,10 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
public class Brown implements Color {
@Override
public String getColor() {
return "brown";
}
}

5
core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/Color.java
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@@ -1,5 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
public interface Color {
String getColor();
}

21
core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/ColorFactory.java
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@@ -1,21 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
public class ColorFactory implements AbstractFactory {
@Override
public Color getColor(String colorType) {
if ("Brown".equalsIgnoreCase(colorType)) {
return new Brown();
} else if ("White".equalsIgnoreCase(colorType)) {
return new White();
}
return null;
}
@Override
public Animal getAnimal(String toyType) {
throw new UnsupportedOperationException();
}
}

15
core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/Dog.java
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@@ -1,15 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
public class Dog implements Animal {
@Override
public String getType() {
return "Dog";
}
@Override
public String makeSound() {
return "Barks";
}
}

15
core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/Duck.java
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@@ -1,15 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
public class Duck implements Animal {
@Override
public String getType() {
return "Duck";
}
@Override
public String makeSound() {
return "Squeks";
}
}

15
core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/FactoryProvider.java
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@@ -1,15 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
public class FactoryProvider {
public static AbstractFactory getFactory(String choice){
if("Toy".equalsIgnoreCase(choice)){
return new AnimalFactory();
}
else if("Color".equalsIgnoreCase(choice)){
return new ColorFactory();
}
return null;
}
}

10
core-java/src/main/java/com/baeldung/designpatterns/creational/abstractfactory/White.java
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@@ -1,10 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
public class White implements Color {
@Override
public String getColor() {
return "White";
}
}

64
core-java/src/main/java/com/baeldung/designpatterns/creational/builder/BankAccount.java
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@@ -1,64 +0,0 @@
package com.baeldung.designpatterns.creational.builder;
public class BankAccount {
private String name;
private String accountNumber;
private String email;
private boolean newsletter;
//The constructor that takes a builder from which it will create object
//the access to this is only provided to builder
private BankAccount(BankAccountBuilder builder) {
this.name = builder.name;
this.accountNumber = builder.accountNumber;
this.email = builder.email;
this.newsletter = builder.newsletter;
}
public static class BankAccountBuilder {
private String name;
private String accountNumber;
private String email;
private boolean newsletter;
//All Mandatory parameters goes with this constructor
public BankAccountBuilder(String name, String accountNumber) {
this.name = name;
this.accountNumber = accountNumber;
}
//setters for optional parameters which returns this same builder
//to support fluent design
public BankAccountBuilder withEmail(String email) {
this.email = email;
return this;
}
public BankAccountBuilder wantNewsletter(boolean newsletter) {
this.newsletter = newsletter;
return this;
}
//the actual build method that prepares and returns a BankAccount object
public BankAccount build() {
return new BankAccount(this);
}
}
//getters
public String getName() {
return name;
}
public String getAccountNumber() {
return accountNumber;
}
public String getEmail() {
return email;
}
public boolean isNewsletter() {
return newsletter;
}
}

16
core-java/src/main/java/com/baeldung/designpatterns/creational/builder/BuilderPatternDriver.java
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@@ -1,16 +0,0 @@
package com.baeldung.designpatterns.creational.builder;
public class BuilderPatternDriver {
public static void main(String[] args) {
BankAccount newAccount = new BankAccount
.BankAccountBuilder("Jon", "22738022275")
.withEmail("jon@example.com")
.wantNewsletter(true)
.build();
System.out.println("Name: " + newAccount.getName());
System.out.println("AccountNumber:" + newAccount.getAccountNumber());
System.out.println("Email: " + newAccount.getEmail());
System.out.println("Want News letter?: " + newAccount.isNewsletter());
}
}

16
core-java/src/main/java/com/baeldung/designpatterns/creational/factory/FactoryDriver.java
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@@ -1,16 +0,0 @@
package com.baeldung.designpatterns.creational.factory;
public class FactoryDriver {
public static void main(String[] args) {
Polygon p;
PolygonFactory factory = new PolygonFactory();
//get the shape which has 4 sides
p = factory.getPolygon(4);
System.out.println("The shape with 4 sides is a " + p.getType());
//get the shape which has 4 sides
p = factory.getPolygon(8);
System.out.println("The shape with 8 sides is a " + p.getType());
}
}

10
core-java/src/main/java/com/baeldung/designpatterns/creational/factory/Heptagon.java
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@@ -1,10 +0,0 @@
package com.baeldung.designpatterns.creational.factory;
public class Heptagon implements Polygon {
@Override
public String getType() {
return "Heptagon";
}
}

10
core-java/src/main/java/com/baeldung/designpatterns/creational/factory/Octagon.java
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@@ -1,10 +0,0 @@
package com.baeldung.designpatterns.creational.factory;
public class Octagon implements Polygon {
@Override
public String getType() {
return "Octagon";
}
}

10
core-java/src/main/java/com/baeldung/designpatterns/creational/factory/Pentagon.java
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@@ -1,10 +0,0 @@
package com.baeldung.designpatterns.creational.factory;
public class Pentagon implements Polygon {
@Override
public String getType() {
return "Pentagon";
}
}

5
core-java/src/main/java/com/baeldung/designpatterns/creational/factory/Polygon.java
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@@ -1,5 +0,0 @@
package com.baeldung.designpatterns.creational.factory;
public interface Polygon {
String getType();
}

22
core-java/src/main/java/com/baeldung/designpatterns/creational/factory/PolygonFactory.java
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@@ -1,22 +0,0 @@
package com.baeldung.designpatterns.creational.factory;
public class PolygonFactory {
public Polygon getPolygon(int numberOfSides) {
if(numberOfSides == 3) {
return new Triangle();
}
if(numberOfSides == 4) {
return new Square();
}
if(numberOfSides == 5) {
return new Pentagon();
}
if(numberOfSides == 7) {
return new Heptagon();
}
else if(numberOfSides == 8) {
return new Octagon();
}
return null;
}
}

10
core-java/src/main/java/com/baeldung/designpatterns/creational/factory/Square.java
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@@ -1,10 +0,0 @@
package com.baeldung.designpatterns.creational.factory;
public class Square implements Polygon {
@Override
public String getType() {
return "Square";
}
}

10
core-java/src/main/java/com/baeldung/designpatterns/creational/factory/Triangle.java
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@@ -1,10 +0,0 @@
package com.baeldung.designpatterns.creational.factory;
public class Triangle implements Polygon {
@Override
public String getType() {
return "Triangle";
}
}

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

8
core-java/src/main/java/com/baeldung/designpatterns/creational/singleton/SingletonDriver.java
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@@ -1,8 +0,0 @@
package com.baeldung.designpatterns.creational.singleton;
public class SingletonDriver {
public static void main(String[] args) {
Singleton instance = Singleton.getInstance();
System.out.println(instance.toString());
}
}

16
core-java/src/main/java/com/baeldung/designpatterns/decorator/BubbleLights.java
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@@ -1,16 +0,0 @@
package com.baeldung.designpatterns.decorator;
public class BubbleLights extends TreeDecorator {
public BubbleLights(ChristmasTree tree) {
super(tree);
}
public String decorate() {
return super.decorate() + decorateWithBubbleLights();
}
private String decorateWithBubbleLights() {
return " with Bubble Lights";
}
}

5
core-java/src/main/java/com/baeldung/designpatterns/decorator/ChristmasTree.java
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@@ -1,5 +0,0 @@
package com.baeldung.designpatterns.decorator;
public interface ChristmasTree {
String decorate();
}

10
core-java/src/main/java/com/baeldung/designpatterns/decorator/ChristmasTreeImpl.java
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@@ -1,10 +0,0 @@
package com.baeldung.designpatterns.decorator;
public class ChristmasTreeImpl implements ChristmasTree {
@Override
public String decorate() {
return "Christmas tree";
}
}

18
core-java/src/main/java/com/baeldung/designpatterns/decorator/DecoratorPatternDriver.java
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@@ -1,18 +0,0 @@
package com.baeldung.designpatterns.decorator;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;
public class DecoratorPatternDriver {
public static void main(String[] args) {
// christmas tree with just one Garland
ChristmasTree tree1 = new Garland(new ChristmasTreeImpl());
LOG.info(tree1.decorate());
// christmas tree with two Garlands and one Bubble lights
ChristmasTree tree2 = new BubbleLights(new Garland(new Garland(new ChristmasTreeImpl())));
LOG.info(tree2.decorate());
}
}

16
core-java/src/main/java/com/baeldung/designpatterns/decorator/Garland.java
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@@ -1,16 +0,0 @@
package com.baeldung.designpatterns.decorator;
public class Garland extends TreeDecorator {
public Garland(ChristmasTree tree) {
super(tree);
}
public String decorate() {
return super.decorate() + decorateWithGarland();
}
private String decorateWithGarland() {
return " with Garland";
}
}

15
core-java/src/main/java/com/baeldung/designpatterns/decorator/TreeDecorator.java
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@@ -1,15 +0,0 @@
package com.baeldung.designpatterns.decorator;
public abstract class TreeDecorator implements ChristmasTree {
private ChristmasTree tree;
public TreeDecorator(ChristmasTree tree) {
this.tree = tree;
}
@Override
public String decorate() {
return tree.decorate();
}
}

85
core-java/src/main/java/com/baeldung/designpatterns/flyweight/Car.java
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@@ -1,85 +0,0 @@
package com.baeldung.designpatterns.flyweight;
import java.awt.Color;
import javax.annotation.concurrent.Immutable;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Represents a car. This class is immutable.
*
* @author Donato Rimenti
*/
@Immutable
public class Car implements Vehicle {
/**
* Logger.
*/
private final static Logger LOG = LoggerFactory.getLogger(Car.class);
/**
* The car's engine.
*/
private Engine engine;
/**
* The car's color.
*/
private Color color;
/**
* Instantiates a new Car.
*
* @param engine
* the {@link #engine}
* @param color
* the {@link #color}
*/
public Car(Engine engine, Color color) {
this.engine = engine;
this.color = color;
// Building a new car is a very expensive operation!
try {
Thread.sleep(2000);
} catch (InterruptedException e) {
LOG.error("Error while creating a new car", e);
}
}
/*
* (non-Javadoc)
*
* @see com.baeldung.designpatterns.flyweight.Vehicle#start()
*/
@Override
public void start() {
LOG.info("Car is starting!");
engine.start();
}
/*
* (non-Javadoc)
*
* @see com.baeldung.designpatterns.flyweight.Vehicle#stop()
*/
@Override
public void stop() {
LOG.info("Car is stopping!");
engine.stop();
}
/*
* (non-Javadoc)
*
* @see com.baeldung.designpatterns.flyweight.Vehicle#getColor()
*/
@Override
public Color getColor() {
return this.color;
}
}

31
core-java/src/main/java/com/baeldung/designpatterns/flyweight/Engine.java
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@@ -1,31 +0,0 @@
package com.baeldung.designpatterns.flyweight;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Engine for a vehicle.
*
* @author Donato Rimenti
*/
public class Engine {
/**
* Logger.
*/
private final static Logger LOG = LoggerFactory.getLogger(Engine.class);
/**
* Starts the engine.
*/
public void start() {
LOG.info("Engine is starting!");
}
/**
* Stops the engine.
*/
public void stop() {
LOG.info("Engine is stopping!");
}
}

29
core-java/src/main/java/com/baeldung/designpatterns/flyweight/Vehicle.java
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@@ -1,29 +0,0 @@
package com.baeldung.designpatterns.flyweight;
import java.awt.Color;
/**
* Interface for a vehicle.
*
* @author Donato Rimenti
*/
public interface Vehicle {
/**
* Starts the vehicle.
*/
public void start();
/**
* Stops the vehicle.
*/
public void stop();
/**
* Gets the color of the vehicle.
*
* @return the color of the vehicle
*/
public Color getColor();
}

45
core-java/src/main/java/com/baeldung/designpatterns/flyweight/VehicleFactory.java
View File

@@ -1,45 +0,0 @@
package com.baeldung.designpatterns.flyweight;
import java.awt.Color;
import java.util.HashMap;
import java.util.Map;
/**
* Factory which implements the Flyweight pattern to return an existing vehicle
* if present or a new one otherwise.
*
* @author Donato Rimenti
*/
public class VehicleFactory {
/**
* Stores the already created vehicles.
*/
private static Map<Color, Vehicle> vehiclesCache = new HashMap<Color, Vehicle>();
/**
* Private constructor to prevent this class instantiation.
*/
private VehicleFactory() {
}
/**
* Returns a vehicle of the same color passed as argument. If that vehicle
* was already created by this factory, that vehicle is returned, otherwise
* a new one is created and returned.
*
* @param color
* the color of the vehicle to return
* @return a vehicle of the specified color
*/
public static Vehicle createVehicle(Color color) {
// Looks for the requested vehicle into the cache.
// If the vehicle doesn't exist, a new one is created.
Vehicle newVehicle = vehiclesCache.computeIfAbsent(color, newColor -> {
// Creates the new car.
Engine newEngine = new Engine();
return new Car(newEngine, newColor);
});
return newVehicle;
}
}

5
core-java/src/main/java/com/baeldung/designpatterns/observer/Channel.java
View File

@@ -1,5 +0,0 @@
package com.baeldung.designpatterns.observer;
public interface Channel {
public void update(Object o);
}

24
core-java/src/main/java/com/baeldung/designpatterns/observer/NewsAgency.java
View File

@@ -1,24 +0,0 @@
package com.baeldung.designpatterns.observer;
import java.util.ArrayList;
import java.util.List;
public class NewsAgency {
private String news;
private List<Channel> channels = new ArrayList<>();
public void addObserver(Channel channel) {
this.channels.add(channel);
}
public void removeObserver(Channel channel) {
this.channels.remove(channel);
}
public void setNews(String news) {
this.news = news;
for (Channel channel : this.channels) {
channel.update(this.news);
}
}
}

20
core-java/src/main/java/com/baeldung/designpatterns/observer/NewsChannel.java
View File

@@ -1,20 +0,0 @@
package com.baeldung.designpatterns.observer;
public class NewsChannel implements Channel {
private String news;
@Override
public void update(Object news) {
this.setNews((String) news);
}
public String getNews() {
return news;
}
public void setNews(String news) {
this.news = news;
}
}

13
core-java/src/main/java/com/baeldung/designpatterns/observer/ONewsAgency.java
View File

@@ -1,13 +0,0 @@
package com.baeldung.designpatterns.observer;
import java.util.Observable;
public class ONewsAgency extends Observable {
private String news;
public void setNews(String news) {
this.news = news;
setChanged();
notifyObservers(news);
}
}

22
core-java/src/main/java/com/baeldung/designpatterns/observer/ONewsChannel.java
View File

@@ -1,22 +0,0 @@
package com.baeldung.designpatterns.observer;
import java.util.Observable;
import java.util.Observer;
public class ONewsChannel implements Observer {
private String news;
@Override
public void update(Observable o, Object news) {
this.setNews((String) news);
}
public String getNews() {
return news;
}
public void setNews(String news) {
this.news = news;
}
}

28
core-java/src/main/java/com/baeldung/designpatterns/observer/PCLNewsAgency.java
View File

@@ -1,28 +0,0 @@
package com.baeldung.designpatterns.observer;
import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeSupport;
public class PCLNewsAgency {
private String news;
private PropertyChangeSupport support;
public PCLNewsAgency() {
support = new PropertyChangeSupport(this);
}
public void addPropertyChangeListener(PropertyChangeListener pcl) {
support.addPropertyChangeListener(pcl);
}
public void removePropertyChangeListener(PropertyChangeListener pcl) {
support.removePropertyChangeListener(pcl);
}
public void setNews(String value) {
support.firePropertyChange("news", this.news, value);
this.news = value;
}
}

21
core-java/src/main/java/com/baeldung/designpatterns/observer/PCLNewsChannel.java
View File

@@ -1,21 +0,0 @@
package com.baeldung.designpatterns.observer;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;
public class PCLNewsChannel implements PropertyChangeListener {
private String news;
public void propertyChange(PropertyChangeEvent evt) {
this.setNews((String) evt.getNewValue());
}
public String getNews() {
return news;
}
public void setNews(String news) {
this.news = news;
}
}

5
core-java/src/main/java/com/baeldung/designpatterns/proxy/ExpensiveObject.java
View File

@@ -1,5 +0,0 @@
package com.baeldung.designpatterns.proxy;
public interface ExpensiveObject {
void process();
}

20
core-java/src/main/java/com/baeldung/designpatterns/proxy/ExpensiveObjectImpl.java
View File

@@ -1,20 +0,0 @@
package com.baeldung.designpatterns.proxy;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;;
public class ExpensiveObjectImpl implements ExpensiveObject {
public ExpensiveObjectImpl() {
heavyInitialConfiguration();
}
@Override
public void process() {
LOG.info("processing complete.");
}
private void heavyInitialConfiguration() {
LOG.info("Loading initial configuration...");
}
}

13
core-java/src/main/java/com/baeldung/designpatterns/proxy/ExpensiveObjectProxy.java
View File

@@ -1,13 +0,0 @@
package com.baeldung.designpatterns.proxy;
public class ExpensiveObjectProxy implements ExpensiveObject{
private static ExpensiveObject object;
@Override
public void process() {
if(object == null) {
object = new ExpensiveObjectImpl();
}
object.process();
}
}

9
core-java/src/main/java/com/baeldung/designpatterns/proxy/ProxyPatternDriver.java
View File

@@ -1,9 +0,0 @@
package com.baeldung.designpatterns.proxy;
public class ProxyPatternDriver {
public static void main(String[] args) {
ExpensiveObject object = new ExpensiveObjectProxy();
object.process();
object.process();
}
}

39
core-java/src/main/java/com/baeldung/designpatterns/service/locator/Cache.java
View File

@@ -1,39 +0,0 @@
package com.baeldung.designpatterns.service.locator;
import java.util.ArrayList;
import java.util.List;
/**
* Created by Gebruiker on 4/20/2018.
*/
public class Cache {
private List<MessagingService> services;
public Cache(){
services = new ArrayList<MessagingService>();
}
public MessagingService getService(String serviceName){
for (MessagingService service : services) {
if(service.getServiceName().equalsIgnoreCase(serviceName)){
System.out.println("Returning cached " + serviceName + " object");
return service;
}
}
return null;
}
public void addService(MessagingService newService){
boolean exists = false;
for (MessagingService service : services) {
if(service.getServiceName().equalsIgnoreCase(newService.getServiceName())){
exists = true;
}
}
if(!exists){
services.add(newService);
}
}
}

15
core-java/src/main/java/com/baeldung/designpatterns/service/locator/EmailService.java
View File

@@ -1,15 +0,0 @@
package com.baeldung.designpatterns.service.locator;
/**
* Created by Gebruiker on 4/20/2018.
*/
public class EmailService implements MessagingService {
public String getMessageBody() {
return "email message";
}
public String getServiceName() {
return "EmailService";
}
}

17
core-java/src/main/java/com/baeldung/designpatterns/service/locator/InitialContext.java
View File

@@ -1,17 +0,0 @@
package com.baeldung.designpatterns.service.locator;
/**
* Created by Gebruiker on 4/20/2018.
*/
public class InitialContext {
public Object lookup(String serviceName) {
if (serviceName.equalsIgnoreCase("EmailService")) {
return new EmailService();
} else if (serviceName.equalsIgnoreCase("SMSService")) {
return new SMSService();
}
return null;
}
}

22
core-java/src/main/java/com/baeldung/designpatterns/service/locator/Main.java
View File

@@ -1,22 +0,0 @@
package com.baeldung.designpatterns.service.locator;
/**
* Created by Gebruiker on 4/20/2018.
*/
public class Main {
public static void main(String[] args) {
MessagingService service = ServiceLocator.getService("EmailService");
String email = service.getMessageBody();
System.out.println(email);
service = ServiceLocator.getService("SMSService");
String sms = service.getMessageBody();
System.out.println(sms);
service = ServiceLocator.getService("EmailService");
String newEmail = service.getMessageBody();
System.out.println(newEmail);
}
}

8
core-java/src/main/java/com/baeldung/designpatterns/service/locator/MessagingService.java
View File

@@ -1,8 +0,0 @@
package com.baeldung.designpatterns.service.locator;
public interface MessagingService {
String getMessageBody();
String getServiceName();
}

15
core-java/src/main/java/com/baeldung/designpatterns/service/locator/SMSService.java
View File

@@ -1,15 +0,0 @@
package com.baeldung.designpatterns.service.locator;
/**
* Created by Gebruiker on 4/20/2018.
*/
public class SMSService implements MessagingService {
public String getMessageBody() {
return "sms message";
}
public String getServiceName() {
return "SMSService";
}
}

27
core-java/src/main/java/com/baeldung/designpatterns/service/locator/ServiceLocator.java
View File

@@ -1,27 +0,0 @@
package com.baeldung.designpatterns.service.locator;
/**
* Created by Gebruiker on 4/20/2018.
*/
public class ServiceLocator {
private static Cache cache;
static {
cache = new Cache();
}
public static MessagingService getService(String serviceName){
MessagingService service = cache.getService(serviceName);
if(service != null){
return service;
}
InitialContext context = new InitialContext();
MessagingService service1 = (MessagingService)context.lookup(serviceName);
cache.addService(service1);
return service1;
}
}

28
core-java/src/main/java/com/baeldung/designpatterns/singleton/ClassSingleton.java
View File

@@ -1,28 +0,0 @@
package com.baeldung.designpatterns.singleton;
public class ClassSingleton {
private static ClassSingleton INSTANCE;
private String info = "Initial class info";
private ClassSingleton(){
}
public static ClassSingleton getInstance(){
if(INSTANCE == null){
INSTANCE = new ClassSingleton();
}
return INSTANCE;
}
// getters and setters
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
}

26
core-java/src/main/java/com/baeldung/designpatterns/singleton/EnumSingleton.java
View File

@@ -1,26 +0,0 @@
package com.baeldung.designpatterns.singleton;
public enum EnumSingleton {
INSTANCE("Initial enum info"); //Name of the single instance
private String info;
private EnumSingleton(String info) {
this.info = info;
}
public EnumSingleton getInstance(){
return INSTANCE;
}
//getters and setters
public String getInfo() {
return info;
}
public void setInfo(String info) {
this.info = info;
}
}

32
core-java/src/main/java/com/baeldung/designpatterns/singleton/Sandbox.java
View File

@@ -1,32 +0,0 @@
package com.baeldung.designpatterns.singleton;
public class Sandbox {
public static void main(String[] args) {
//Class singleton
ClassSingleton classSingleton1 = ClassSingleton.getInstance();
//OurSingleton object1 = new OurSingleton(); // The constructor OurSingleton() is not visible
System.out.println(classSingleton1.getInfo()); //Initial class info
ClassSingleton classSingleton2 = ClassSingleton.getInstance();
classSingleton2.setInfo("New class info");
System.out.println(classSingleton1.getInfo()); //New class info
System.out.println(classSingleton2.getInfo()); //New class info
//Enum singleton
EnumSingleton enumSingleton1 = EnumSingleton.INSTANCE.getInstance();
System.out.println(enumSingleton1.getInfo()); //Initial enum info
EnumSingleton enumSingleton2 = EnumSingleton.INSTANCE.getInstance();
enumSingleton2.setInfo("New enum info");
System.out.println(enumSingleton1.getInfo()); //New enum info
System.out.println(enumSingleton2.getInfo()); //New enum info
}
}

38
core-java/src/main/java/com/baeldung/designpatterns/singleton/synchronization/DclSingleton.java
View File

@@ -1,38 +0,0 @@
package com.baeldung.designpatterns.singleton.synchronization;
/**
* Double-checked locking design pattern applied to a singleton.
*
* @author Donato Rimenti
*
*/
public class DclSingleton {
/**
* Current instance of the singleton.
*/
private static volatile DclSingleton instance;
/**
* Private constructor to avoid instantiation.
*/
private DclSingleton() {
}
/**
* Returns the current instance of the singleton.
*
* @return the current instance of the singleton
*/
public static DclSingleton getInstance() {
if (instance == null) {
synchronized (DclSingleton.class) {
if (instance == null) {
instance = new DclSingleton();
}
}
}
return instance;
}
}

34
core-java/src/main/java/com/baeldung/designpatterns/singleton/synchronization/DraconianSingleton.java
View File

@@ -1,34 +0,0 @@
package com.baeldung.designpatterns.singleton.synchronization;
/**
* Draconian singleton. The method to get the instance is synchronized.
*
* @author Donato Rimenti
*
*/
public class DraconianSingleton {
/**
* Current instance of the singleton.
*/
private static DraconianSingleton instance;
/**
* Private constructor to avoid instantiation.
*/
private DraconianSingleton() {
}
/**
* Returns the current instance of the singleton.
*
* @return the current instance of the singleton
*/
public static synchronized DraconianSingleton getInstance() {
if (instance == null) {
instance = new DraconianSingleton();
}
return instance;
}
}

31
core-java/src/main/java/com/baeldung/designpatterns/singleton/synchronization/EarlyInitSingleton.java
View File

@@ -1,31 +0,0 @@
package com.baeldung.designpatterns.singleton.synchronization;
/**
* Singleton with early initialization. Inlines the singleton instance
* initialization.
*
* @author Donato Rimenti
*
*/
public class EarlyInitSingleton {
/**
* Current instance of the singleton.
*/
private static final EarlyInitSingleton INSTANCE = new EarlyInitSingleton();
/**
* Private constructor to avoid instantiation.
*/
private EarlyInitSingleton() {
}
/**
* Returns the current instance of the singleton.
*
* @return the current instance of the singleton
*/
public static EarlyInitSingleton getInstance() {
return INSTANCE;
}
}

16
core-java/src/main/java/com/baeldung/designpatterns/singleton/synchronization/EnumSingleton.java
View File

@@ -1,16 +0,0 @@
package com.baeldung.designpatterns.singleton.synchronization;
/**
* Enum singleton pattern. Uses an enum to hold a reference to the singleton
* instance.
*
* @author Donato Rimenti
*
*/
public enum EnumSingleton {
/**
* Current instance of the singleton.
*/
INSTANCE;
}

41
core-java/src/main/java/com/baeldung/designpatterns/singleton/synchronization/InitOnDemandSingleton.java
View File

@@ -1,41 +0,0 @@
package com.baeldung.designpatterns.singleton.synchronization;
/**
* Initialization on demand singleton pattern. Uses a nested static class to
* hold a reference to the singleton instance.
*
* @author Donato Rimenti
*
*/
public class InitOnDemandSingleton {
/**
* Holder for a singleton instance.
*
* @author Donato Rimenti
*
*/
private static class InstanceHolder {
/**
* Current instance of the singleton.
*/
private static final InitOnDemandSingleton INSTANCE = new InitOnDemandSingleton();
}
/**
* Private constructor to avoid instantiation.
*/
private InitOnDemandSingleton() {
}
/**
* Returns the current instance of the singleton.
*
* @return the current instance of the singleton
*/
public static InitOnDemandSingleton getInstance() {
return InstanceHolder.INSTANCE;
}
}

35
core-java/src/main/java/com/baeldung/designpatterns/util/LogerUtil.java
View File

@@ -1,35 +0,0 @@
package com.baeldung.designpatterns.util;
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Properties;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
public class LogerUtil {
public final static Logger LOG = Logger.getLogger("GLOBAL");
static {
configuration();
}
private static void configuration() {
Properties props = new Properties();
try {
props.load(
new BufferedReader(
new InputStreamReader(
LogerUtil.class.getResourceAsStream("/log4jstructuraldp.properties")
)
)
);
} catch (IOException e) {
System.out.println("log4jstructuraldp.properties file not configured properly");
System.exit(0);
}
PropertyConfigurator.configure(props);
}
}

4
core-java/src/main/java/com/baeldung/numberofdigits/NumberOfDigitsDriver.java
View File

@@ -1,10 +1,12 @@
package com.baeldung.numberofdigits;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;
import org.apache.log4j.Logger;
public class NumberOfDigitsDriver {
private static NumberOfDigits numberOfDigits;
private static Logger LOG = Logger.getLogger(NumberOfDigitsDriver.class);
static {
numberOfDigits = new NumberOfDigits();
}

30
core-java/src/test/java/com/baeldung/designpatterns/AdapterPatternIntegrationTest.java
View File

@@ -1,30 +0,0 @@
package com.baeldung.designpatterns;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import com.baeldung.designpatterns.adapter.AstonMartin;
import com.baeldung.designpatterns.adapter.BugattiVeyron;
import com.baeldung.designpatterns.adapter.McLaren;
import com.baeldung.designpatterns.adapter.Movable;
import com.baeldung.designpatterns.adapter.MovableAdapter;
import com.baeldung.designpatterns.adapter.MovableAdapterImpl;
public class AdapterPatternIntegrationTest {
@Test
public void givenMovableAdapter_WhenConvertingMPHToKMPH_thenSuccessfullyConverted() {
Movable bugattiVeyron = new BugattiVeyron();
MovableAdapter bugattiVeyronAdapter = new MovableAdapterImpl(bugattiVeyron);
assertEquals(bugattiVeyronAdapter.getSpeed(), 431.30312, 0.00001);
Movable mcLaren = new McLaren();
MovableAdapter mcLarenAdapter = new MovableAdapterImpl(mcLaren);
assertEquals(mcLarenAdapter.getSpeed(), 387.85094, 0.00001);
Movable astonMartin = new AstonMartin();
MovableAdapter astonMartinAdapter = new MovableAdapterImpl(astonMartin);
assertEquals(astonMartinAdapter.getSpeed(), 354.0548, 0.00001);
}
}

26
core-java/src/test/java/com/baeldung/designpatterns/BridgePatternIntegrationTest.java
View File

@@ -1,26 +0,0 @@
package com.baeldung.designpatterns;
import static org.junit.Assert.*;
import org.junit.Test;
import com.baeldung.designpatterns.bridge.Blue;
import com.baeldung.designpatterns.bridge.Red;
import com.baeldung.designpatterns.bridge.Shape;
import com.baeldung.designpatterns.bridge.Square;
import com.baeldung.designpatterns.bridge.Triangle;
public class BridgePatternIntegrationTest {
@Test
public void whenBridgePatternInvoked_thenConfigSuccess() {
//a square with red color
Shape square = new Square(new Red());
assertEquals(square.draw(), "Square drawn. Color is Red");
//a triangle with blue color
Shape triangle = new Triangle(new Blue());
assertEquals(triangle.draw(), "Triangle drawn. Color is Blue");
}
}

25
core-java/src/test/java/com/baeldung/designpatterns/DecoratorPatternIntegrationTest.java
View File

@@ -1,25 +0,0 @@
package com.baeldung.designpatterns;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import com.baeldung.designpatterns.decorator.BubbleLights;
import com.baeldung.designpatterns.decorator.ChristmasTree;
import com.baeldung.designpatterns.decorator.ChristmasTreeImpl;
import com.baeldung.designpatterns.decorator.Garland;
public class DecoratorPatternIntegrationTest {
@Test
public void givenDecoratorPattern_WhenDecoratorsInjectedAtRuntime_thenConfigSuccess() {
ChristmasTree tree1 = new Garland(new ChristmasTreeImpl());
assertEquals(tree1.decorate(),
"Christmas tree with Garland");
ChristmasTree tree2 = new BubbleLights(
new Garland(new Garland(new ChristmasTreeImpl())));
assertEquals(tree2.decorate(),
"Christmas tree with Garland with Garland with Bubble Lights");
}
}

44
core-java/src/test/java/com/baeldung/designpatterns/ProxyPatternIntegrationTest.java
View File

@@ -1,44 +0,0 @@
package com.baeldung.designpatterns;
import static com.baeldung.designpatterns.util.LogerUtil.LOG;
import static org.hamcrest.CoreMatchers.is;
import static org.junit.Assert.assertThat;
import java.util.List;
import org.apache.log4j.spi.LoggingEvent;
import org.junit.After;
import org.junit.Before;
import org.junit.Test;
import com.baeldung.designpatterns.proxy.ExpensiveObject;
import com.baeldung.designpatterns.proxy.ExpensiveObjectProxy;
public class ProxyPatternIntegrationTest {
public static TestAppenderDP appender;
@Before
public void setUp() {
appender = new TestAppenderDP();
LOG.addAppender(appender);
}
@Test
public void givenExpensiveObjectProxy_WhenObjectInitialized_thenInitializedOnlyOnce() {
ExpensiveObject object = new ExpensiveObjectProxy();
object.process();
object.process();
final List<LoggingEvent> log = appender.getLog();
assertThat((String) log.get(0).getMessage(), is("Loading initial configuration..."));
assertThat((String) log.get(1).getMessage(), is("processing complete."));
assertThat((String) log.get(2).getMessage(), is("processing complete."));
}
@After
public void tearDown() {
LOG.removeAppender(appender);
}
}

29
core-java/src/test/java/com/baeldung/designpatterns/TestAppenderDP.java
View File

@@ -1,29 +0,0 @@
package com.baeldung.designpatterns;
import java.util.ArrayList;
import java.util.List;
import org.apache.log4j.AppenderSkeleton;
import org.apache.log4j.spi.LoggingEvent;
public class TestAppenderDP extends AppenderSkeleton {
private final List<LoggingEvent> log = new ArrayList<LoggingEvent>();
@Override
public boolean requiresLayout() {
return false;
}
@Override
protected void append(final LoggingEvent loggingEvent) {
log.add(loggingEvent);
}
@Override
public void close() {
}
public List<LoggingEvent> getLog() {
return new ArrayList<LoggingEvent>(log);
}
}

23
core-java/src/test/java/com/baeldung/designpatterns/creational/abstractfactory/AbstractPatternIntegrationTest.java
View File

@@ -1,23 +0,0 @@
package com.baeldung.designpatterns.creational.abstractfactory;
import static org.junit.Assert.*;
import org.junit.Test;
public class AbstractPatternIntegrationTest {
@Test
public void givenAbstractFactory_whenGettingObjects_thenSuccessful() {
AbstractFactory abstractFactory;
//creating a brown toy dog
abstractFactory = FactoryProvider.getFactory("Toy");
Animal toy = abstractFactory.getAnimal("Dog");
abstractFactory = FactoryProvider.getFactory("Color");
Color color = abstractFactory.getColor("Brown");
String result = "A " + toy.getType() + " with " + color.getColor() + " color " + toy.makeSound();
assertEquals("A Dog with brown color Barks", result);
}
}

33
core-java/src/test/java/com/baeldung/designpatterns/creational/builder/BuilderPatternIntegrationTest.java
View File

@@ -1,33 +0,0 @@
package com.baeldung.designpatterns.creational.builder;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
public class BuilderPatternIntegrationTest {
@Test
public void whenCreatingObjectThroughBuilder_thenObjectValid() {
BankAccount newAccount = new BankAccount
.BankAccountBuilder("Jon", "22738022275")
.withEmail("jon@example.com")
.wantNewsletter(true)
.build();
assertEquals(newAccount.getName(), "Jon");
assertEquals(newAccount.getAccountNumber(), "22738022275");
assertEquals(newAccount.getEmail(), "jon@example.com");
assertEquals(newAccount.isNewsletter(), true);
}
@Test
public void whenSkippingOptionalParameters_thenObjectValid() {
BankAccount newAccount = new BankAccount
.BankAccountBuilder("Jon", "22738022275")
.build();
assertEquals(newAccount.getName(), "Jon");
assertEquals(newAccount.getAccountNumber(), "22738022275");
assertEquals(newAccount.getEmail(), null);
assertEquals(newAccount.isNewsletter(), false);
}
}

32
core-java/src/test/java/com/baeldung/designpatterns/creational/factory/FactoryIntegrationTest.java
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package com.baeldung.designpatterns.creational.factory;
import static org.junit.Assert.*;
import org.junit.Test;
public class FactoryIntegrationTest {
@Test
public void whenUsingFactoryForSquare_thenCorrectObjectReturned() {
Polygon p;
PolygonFactory factory = new PolygonFactory();
//get the shape which has 4 sides
p = factory.getPolygon(4);
String result = "The shape with 4 sides is a " + p.getType();
assertEquals("The shape with 4 sides is a Square", result);
}
@Test
public void whenUsingFactoryForOctagon_thenCorrectObjectReturned() {
Polygon p;
PolygonFactory factory = new PolygonFactory();
//get the shape which has 4 sides
p = factory.getPolygon(8);
String result = "The shape with 8 sides is a " + p.getType();
assertEquals("The shape with 8 sides is a Octagon", result);
}
}

26
core-java/src/test/java/com/baeldung/designpatterns/creational/singleton/SingletonIntegrationTest.java
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package com.baeldung.designpatterns.creational.singleton;
import org.junit.Test;
import static org.junit.Assert.*;
public class SingletonIntegrationTest {
@Test
/**
* Although there is absolutely no way to determine whether
* a class is Singleton, in this test case, we will just
* check for two objects if they point to same instance or
* not. We will also check for their hashcode.
*/
public void whenGettingMultipleObjects_thenAllPointToSame() {
//first object
Singleton obj1 = Singleton.getInstance();
//Second object
Singleton obj2 = Singleton.getInstance();
assertTrue(obj1 == obj2);
assertEquals(obj1.hashCode(), obj2.hashCode());
}
}

42
core-java/src/test/java/com/baeldung/designpatterns/flyweight/FlyweightUnitTest.java
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package com.baeldung.designpatterns.flyweight;
import java.awt.Color;
import org.junit.Assert;
import org.junit.Test;
/**
* Unit test for {@link VehicleFactory}.
*
* @author Donato Rimenti
*/
public class FlyweightUnitTest {
/**
* Checks that when the {@link VehicleFactory} is asked to provide two
* vehicles of different colors, the objects returned are different.
*/
@Test
public void givenDifferentFlyweightObjects_whenEquals_thenFalse() {
Vehicle blackVehicle = VehicleFactory.createVehicle(Color.BLACK);
Vehicle blueVehicle = VehicleFactory.createVehicle(Color.BLUE);
Assert.assertNotNull("Object returned by the factory is null!", blackVehicle);
Assert.assertNotNull("Object returned by the factory is null!", blueVehicle);
Assert.assertNotEquals("Objects returned by the factory are equals!", blackVehicle, blueVehicle);
}
/**
* Checks that when the {@link VehicleFactory} is asked to provide two
* vehicles of the same colors, the same object is returned twice.
*/
@Test
public void givenSameFlyweightObjects_whenEquals_thenTrue() {
Vehicle blackVehicle = VehicleFactory.createVehicle(Color.BLACK);
Vehicle anotherBlackVehicle = VehicleFactory.createVehicle(Color.BLACK);
Assert.assertNotNull("Object returned by the factory is null!", blackVehicle);
Assert.assertNotNull("Object returned by the factory is null!", anotherBlackVehicle);
Assert.assertEquals("Objects returned by the factory are not equals!", blackVehicle, anotherBlackVehicle);
}
}

47
core-java/src/test/java/com/baeldung/designpatterns/observer/ObserverIntegrationTest.java
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package com.baeldung.designpatterns.observer;
import static org.junit.Assert.assertEquals;
import org.junit.Test;
import com.baeldung.designpatterns.observer.NewsAgency;
import com.baeldung.designpatterns.observer.NewsChannel;
public class ObserverIntegrationTest {
@Test
public void whenChangingNewsAgencyState_thenNewsChannelNotified() {
NewsAgency observable = new NewsAgency();
NewsChannel observer = new NewsChannel();
observable.addObserver(observer);
observable.setNews("news");
assertEquals(observer.getNews(), "news");
}
@Test
public void whenChangingONewsAgencyState_thenONewsChannelNotified() {
ONewsAgency observable = new ONewsAgency();
ONewsChannel observer = new ONewsChannel();
observable.addObserver(observer);
observable.setNews("news");
assertEquals(observer.getNews(), "news");
}
@Test
public void whenChangingPCLNewsAgencyState_thenONewsChannelNotified() {
PCLNewsAgency observable = new PCLNewsAgency();
PCLNewsChannel observer = new PCLNewsChannel();
observable.addPropertyChangeListener(observer);
observable.setNews("news");
assertEquals(observer.getNews(), "news");
}
}

119
core-java/src/test/java/com/baeldung/designpatterns/singleton/synchronization/SingletonSynchronizationUnitTest.java
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package com.baeldung.designpatterns.singleton.synchronization;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;
import org.junit.Assert;
import org.junit.Test;
/**
* Unit tests for the singleton synchronization package with the same name.
*
* @author Donato Rimenti
*
*/
public class SingletonSynchronizationUnitTest {
/**
* Size of the thread pools used.
*/
private static final int POOL_SIZE = 1_000;
/**
* Number of tasks to submit.
*/
private static final int TASKS_TO_SUBMIT = 1_000_000;
/**
* Tests the thread-safety of {@link DraconianSingleton}.
*/
@Test
public void givenDraconianSingleton_whenMultithreadInstancesEquals_thenTrue() {
ExecutorService executor = Executors.newFixedThreadPool(POOL_SIZE);
Set<DraconianSingleton> resultSet = Collections.synchronizedSet(new HashSet<DraconianSingleton>());
// Submits the instantiation tasks.
for (int i = 0; i < TASKS_TO_SUBMIT; i++) {
executor.submit(() -> resultSet.add(DraconianSingleton.getInstance()));
}
// Since the instance of the object we inserted into the set is always
// the same, the size should be one.
Assert.assertEquals(1, resultSet.size());
}
/**
* Tests the thread-safety of {@link DclSingleton}.
*/
@Test
public void givenDclSingleton_whenMultithreadInstancesEquals_thenTrue() {
ExecutorService executor = Executors.newFixedThreadPool(POOL_SIZE);
Set<DclSingleton> resultSet = Collections.synchronizedSet(new HashSet<DclSingleton>());
// Submits the instantiation tasks.
for (int i = 0; i < TASKS_TO_SUBMIT; i++) {
executor.submit(() -> resultSet.add(DclSingleton.getInstance()));
}
// Since the instance of the object we inserted into the set is always
// the same, the size should be one.
Assert.assertEquals(1, resultSet.size());
}
/**
* Tests the thread-safety of {@link EarlyInitSingleton}.
*/
@Test
public void givenEarlyInitSingleton_whenMultithreadInstancesEquals_thenTrue() {
ExecutorService executor = Executors.newFixedThreadPool(POOL_SIZE);
Set<EarlyInitSingleton> resultSet = Collections.synchronizedSet(new HashSet<EarlyInitSingleton>());
// Submits the instantiation tasks.
for (int i = 0; i < TASKS_TO_SUBMIT; i++) {
executor.submit(() -> resultSet.add(EarlyInitSingleton.getInstance()));
}
// Since the instance of the object we inserted into the set is always
// the same, the size should be one.
Assert.assertEquals(1, resultSet.size());
}
/**
* Tests the thread-safety of {@link InitOnDemandSingleton}.
*/
@Test
public void givenInitOnDemandSingleton_whenMultithreadInstancesEquals_thenTrue() {
ExecutorService executor = Executors.newFixedThreadPool(POOL_SIZE);
Set<InitOnDemandSingleton> resultSet = Collections.synchronizedSet(new HashSet<InitOnDemandSingleton>());
// Submits the instantiation tasks.
for (int i = 0; i < TASKS_TO_SUBMIT; i++) {
executor.submit(() -> resultSet.add(InitOnDemandSingleton.getInstance()));
}
// Since the instance of the object we inserted into the set is always
// the same, the size should be one.
Assert.assertEquals(1, resultSet.size());
}
/**
* Tests the thread-safety of {@link EnumSingleton}.
*/
@Test
public void givenEnumSingleton_whenMultithreadInstancesEquals_thenTrue() {
ExecutorService executor = Executors.newFixedThreadPool(POOL_SIZE);
Set<EnumSingleton> resultSet = Collections.synchronizedSet(new HashSet<EnumSingleton>());
// Submits the instantiation tasks.
for (int i = 0; i < TASKS_TO_SUBMIT; i++) {
executor.submit(() -> resultSet.add(EnumSingleton.INSTANCE));
}
// Since the instance of the object we inserted into the set is always
// the same, the size should be one.
Assert.assertEquals(1, resultSet.size());
}
}