Design Pattern - Adapter - Sample Case

(Adapter) README.txt

(Adapter) Langkah Pembuatan : 
1. Interface Bird.java dan ToyDuck.java 
2. Class Sparrow.java dan PlasticToyDuck.java 
3. BirdAdapter.java 
4. AdapterClient.java

AdapterClient.java

public class AdapterClient {
    public static void main(String[] args) {
        Sparrow sparrow = new Sparrow();
        PlasticToyDuck toyDuck = new PlasticToyDuck();

        // Bungkus bird dengan birdAdapter sehingga bertingkah laku seperti toy duck
        ToyDuck birdAdapter = new BirdAdapter(sparrow);

        System.out.println("Sparrow...");
        sparrow.fly();
        sparrow.makeSound();

        System.out.println("ToyDuck...");
        toyDuck.squeak();

        // bird bertingkah laku seperti toy duck
        System.out.println("BirdAdapter...");
        birdAdapter.squeak();
    }
}

Bird.java

public interface Bird {
    public void fly();
    public void makeSound();
}

BirdAdapter.java

public class BirdAdapter implements ToyDuck {
    Bird bird;

    public BirdAdapter(Bird bird) {
        this.bird = bird;
    }

    @Override
    public void squeak() {
        bird.makeSound();
    }
}

PlasticToyDuck.java

public class PlasticToyDuck implements ToyDuck{
    @Override
    public void squeak() {
        System.out.printf("Squeak");
    }
}

Sparrow.java

public class Sparrow implements Bird {
    @Override
    public void fly() {
        System.out.printf("Flying");
    }

    @Override
    public void makeSound() {
        System.out.printf("Chirp chirp");
    }
}

ToyDuck.java

public interface ToyDuck {
    public void squeak();
}