Design Pattern Decorator JAVA

Decorator Pattern adalah pattern yang digunakan untuk menambahkan fungsionalitas baru ke dalam objek tanpa merubah struktur objek tersebut.

// People.java
public interface People {
    void clothes();
}

// Coat.java
public class Coat implements People {
    public void clothes() {
        System.out.println("Outfit : Coat");
    }
}

// Jeans.java
public class Jeans implements People {
    public void clothes() {
        System.out.println("Outfit : Coat, Jeans");
    }
}

// Scarf.java
public class Scarf implements People {
    public void clothes() {
        System.out.println("Outfit : Coat, Jeans, Scarf");
    }
}

// Beanie.java
public class Beanie implements People {
    public void clothes() {
        System.out.println("Outfit : Coat, Jeans, Scarf, Beanie");
    }
}

// Socks.java
public class Socks implements People {
    public void clothes() {
        System.out.println("Outfit : Coat, Jeans, Scarf, Beanie, Socks");
    }
}

// Boots.java
public class Boots implements People {
    public void clothes() {
        System.out.println("Outfit : Coat, Jeans, Scarf, Beanie, Socks, Boots");
    }
}

// ClothesDecorator.java
public abstract class ClothesDecorator implements People {
    protected People decoratedClothes;

    public ClothesDecorator(People decoratedClothes) {
        this.decoratedClothes = decoratedClothes;
    }

    public void clothes() {
        decoratedClothes.clothes();
    }
}

// Warm.java
public class Warm extends ClothesDecorator {

    public Warm(People decoratedClothes) {
        super(decoratedClothes);
    }

    public void clothes() {
        decoratedClothes.clothes();
        setWarm(decoratedClothes);
    }

    private void setWarm(People decoratedClothes) {
        System.out.println("The clothes can makes you warm");
    }
}

// Progress.java
public class Progress {
    public static void main(String[] args) {
        People coat = new Warm(new Coat());
        People jeans = new Warm(new Jeans());
        People scarf = new Warm(new Scarf());
        People beanie = new Warm(new Beanie());
        People socks = new Warm(new Socks());
        People boots = new Warm(new Boots());

        System.out.println("\t\tWhen winter comes, people are using winter clothes");
        System.out.println("\nPeople are using Coat");
        coat.clothes();

        System.out.println("\nPeople are using Jeans");
        jeans.clothes();

        System.out.println("\nPeople are using Scarf");
        scarf.clothes();

        System.out.println("\nPeople are using Beanie");
        beanie.clothes();

        System.out.println("\nPeople are using Socks");
        socks.clothes();

        System.out.println("\nPeople are using Boots");
        boots.clothes();
    }
}