Java设计模式以虹猫蓝兔的故事讲解装饰器模式

public interface Qi {
    void show();
}

public class Hong implements Qi {
    @Override
    public void show() {
        System.out.println("烧烤一个虹猫");
    }
}

public class JiaLiao implements Qi {
    private Qi qi;
    JiaLiao() {
    }
    JiaLiao(Qi component) {
        this.qi = component;
    }
    @Override
    public void show() {
        qi.show();
    }
}

public class Yan extends JiaLiao {
    private Qi qi;
    Yan() {
    }
    Yan(Qi qi) {
        super(qi);
    }
    @Override
    public void show() {
        super.show();
        add();
    }
    public void add() {
        System.out.println("加盐");
    }
}

public class ZiRan extends JiaLiao {
    private Qi qi;
    ZiRan() {
    }
    ZiRan(Qi qi) {
        super(qi);
    }
    @Override
    public void show() {
        super.show();
        add();
    }
    public void add() {
        System.out.println("加孜然");
    }
}

public class Demo {
    public static void main(String[] args) {
        Qi qi = new Hong();
        qi.show();
        System.out.println();
        Qi qi1 = new Yan(qi);
        qi1.show();
        System.out.println();
        Qi qi2 = new ZiRan(qi1);
        qi2.show();
    }
}