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‎designPattern/Decorator/DecorateIcecream.java‎

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package designPattern.Decorator;
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public abstract class DecorateIcecream implements Icecream {
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Icecream icecream;
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}
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class Chocolate extends DecorateIcecream{
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public Chocolate(Icecream icecream) {
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this.icecream = icecream;
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}
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@Override
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public String description() {
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return "Chocolate";
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}
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@Override
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public Double cost() {
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return this.icecream.cost() + 5.0;
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}
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}
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class Peanuts extends DecorateIcecream{
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public Peanuts(Icecream icecream) {
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this.icecream = icecream;
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}
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@Override
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public String description() {
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return "Peanuts";
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}
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@Override
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public Double cost() {
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return this.icecream.cost() + 3.0;
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}
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}

‎designPattern/Decorator/Icecream.java‎

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package designPattern.Decorator;
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public interface Icecream {
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public String description();
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public Double cost();
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}
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class Vanilla implements Icecream {
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@Override
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public String description() {
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return "Vanila Icecream!";
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}
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@Override
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public Double cost() {
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return 15.0;
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}
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}
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class Strawberry implements Icecream {
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@Override
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public String description() {
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return "Strawberry Icecream!";
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}
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@Override
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public Double cost() {
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return 20.0;
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}
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}

‎designPattern/Decorator/TestDecorator.java‎

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package designPattern.Decorator;
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public class TestDecorator {
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public static void main(String[] args) {
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Icecream vanilla = new Vanilla();
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System.out.println("Simple vanilla cost: " + vanilla.cost());
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Icecream vanillaWithPeanuts = new Peanuts(vanilla);
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System.out.println("Vanilla with peanuts cost: " + vanillaWithPeanuts.cost());
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Icecream vanillaWithChocolate = new Chocolate(vanilla);
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System.out.println("Vanilla with chocolate cost: " + vanillaWithChocolate.cost());
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}
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}

‎designPattern/Observer/Observer.java‎

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package designPattern.Observer;
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public interface Observer {
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public void update(String message);
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public void display();
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}

‎designPattern/Observer/Student.java‎

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package designPattern.Observer;
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public class Student implements Observer{
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private String message;
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public Student(StudentData data) {
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data.registerObserver(this);
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}
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public void update(String message) {
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this.message = message;
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display();
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}
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public void display() {
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System.out.println(this.message);
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}
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}

‎designPattern/Observer/StudentData.java‎

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package designPattern.Observer;
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import java.util.ArrayList;
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public class StudentData {
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private String message;
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private ArrayList<Observer> observers;
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public StudentData() {
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observers = new ArrayList<>();
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}
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public void registerObserver(Observer o) {
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observers.add(o);
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}
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public void removeObserver(Observer o) {
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observers.remove(o);
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}
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public void notifyObservers() {
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for(int i = 0; i < observers.size(); i++) {
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Observer obs = (Observer) observers.get(i);
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obs.update(message);
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}
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}
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public void setMessage(String msg) {
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this.message = msg;
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}
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public String getMessage() {
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return this.message;
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}
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}

‎designPattern/Observer/TestObserver.java‎

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package designPattern.Observer;
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public class TestObserver {
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public static void main(String[] args) {
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StudentData data = new StudentData();
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Observer std = new Student(data);
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String msg = "Hello World";
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data.setMessage(msg);
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if(!data.getMessage().equals("")) {
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data.notifyObservers();
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}
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data.removeObserver(std);
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if(!data.getMessage().equals("")) {
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data.notifyObservers();
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}
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}
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}

‎designPattern/Singleton/Settings.java‎

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package designPattern.Singleton;
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public class Settings {
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private static Settings firstObject = null;
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private String font = "calibri";
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private String color = "black";
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private Settings() {
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}
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public static Settings getObject() {
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if (firstObject == null) {
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firstObject = new Settings();
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}
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return firstObject;
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}
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public void setFont(String fontName) {
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this.font = fontName;
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}
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public void setColor(String colorName) {
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this.color = colorName;
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}
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public String getFont() {
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return this.font;
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}
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public String getColor() {
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return this.color;
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}
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}

‎designPattern/Singleton/TestSetting.java‎

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package designPattern.Singleton;
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public class TestSetting {
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public static void main(String[] args) {
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Settings setting = Settings.getObject();
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System.out.println("Setting Object Color: " + setting.getColor());
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System.out.println("Font: " + setting.getFont());
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Settings set1=Settings.getObject();
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set1.setColor("Red");
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System.out.println("Set Object Color: " + set1.getColor());
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System.out.println("Font: " + set1.getFont());
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System.out.println("Setting Object Color: " + setting.getColor());
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}
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}

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