Design Pattern - Facade - Sample Case

(Facade) README.txt

(Facade) Langkah pembuatan : 
1. Interface LaptopShop.java 
2. Asus.java, Lenovo.java, Acer.java 
3. Facade Class ShopKeeper.java 
4. FacadePatternClient.java

Acer.java

public class Acer implements LaptopShop {
    @Override
    public void modelNo() {
        System.out.println("Acer Aspire ES1");
    }

    @Override
    public void price() {
        System.out.println("Rp. 3.000.000");
    }
}

Asus.java

public class Asus implements LaptopShop{
    @Override
    public void modelNo() {
        System.out.println("ASUS X455LA");
    }

    @Override
    public void price() {
        System.out.println("Rp. 5.000.000");
    }
}

FacadePatternClient.java

public class FacadePatternClient {
    public static void main(String[] args) {
        ShopKeeper sk = new ShopKeeper();

        sk.asusSale();
        sk.lenovoSale();
        sk.acerSale();
    }
}

LaptopShop.java

public interface LaptopShop {
  public void modelNo();
  public void price();
}

Lenovo.java

public class Lenovo implements LaptopShop {
    @Override
    public void modelNo() {
        System.out.println("Lenovo Ideapad");
    }

    @Override
    public void price() {
        System.out.println("Rp. 3.000.000");
    }
}

ShopKeeper.java

public class ShopKeeper {
    private LaptopShop asus;
    private LaptopShop lenovo;
    private LaptopShop acer;

    public ShopKeeper() {
        asus = new Asus();
        lenovo = new Lenovo();
        acer = new Acer();
    }

    public void asusSale() {
        asus.modelNo();
        asus.price();
    }

    public void lenovoSale() {
        lenovo.modelNo();
        lenovo.price();
    }

    public void acerSale() {
        acer.modelNo();
        acer.price();
    }

}