Friends

Friends接口

public interface Friends {
    void doSomeThing();
}

Friends接口实现类

import com.test.demo.textdemo.zsz.service.Friends;
public class ZhangJiChong implements Friends {
    @Override
    public void doSomeThing() {
        System.out.println("张计冲");
    }
}

import com.test.demo.textdemo.zsz.service.Friends;
public class ZhouQinTao implements Friends {
    @Override
    public void doSomeThing() {
        System.out.println("周钦涛");
    }
}

装饰者

装饰者类

public class Decorator implements Friends {
    public Friends friends;
    public Decorator(Friends friends) {
        this.friends = friends;
    }
    @Override
    public void doSomeThing() {
        friends.doSomeThing();
    }
}

装饰者的具体实现

import com.test.demo.textdemo.zsz.decorator.Decorator;
import com.test.demo.textdemo.zsz.service.Friends;
public class Eat extends Decorator {
    public Eat(Friends friends) {
        super(friends);
    }
    @Override
    public void doSomeThing() {
        friends.doSomeThing();
        System.out.println("吃了屎");
    }
}

测试

public class Main {
    public static void main(String[] args) {
        Eat eat = new Eat(new Eat(new ZhangJiChong()));
        eat.doSomeThing();
    }
}
//runtime
张计冲
吃了屎
吃了屎