装饰器模式

public interface Person {
    void show();
}

public class Kiruma implements Person {

    private String name;

    public Kiruma(String name){
        this.name=name;
    }

    @Override
    public void show(){
        System.out.println(name+"什么都没穿");
    }
}

public abstract class Decotator implements Person{

    private Person person;

    public void setPerson(Person person){
        this.person=person;
    }
    public void show(){
        if(person!=null){
            person.show();
        }
    }

}

public class Shoes extends Decotator{

    @Override
    public void show(){
        super.show();
        System.out.println("穿上了鞋子");
    }

}

public class Tshit extends Decotator {


    @Override
    public void show(){
        super.show();
        System.out.println("穿上了Tshit");
    }
}

public class Test {

    public static void main(String[] args){
            Kiruma kiruma=new Kiruma("kiruma");
            Shoes shoes=new Shoes();
            shoes.setPerson(kiruma);
            Tshit tshit=new Tshit();
            tshit.setPerson(shoes);
            tshit.show();


    }
}

可以看到，最顶层的父类是Person ,装饰器也是继承于Person的，这样子做的好处是，无论我们想要加上什么新的东西，都不需要动原先的代码。