设计模式---装饰模式

今天学习了装饰模式，做个笔记。。装饰模式的基础概念可以参考：https://blog.csdn.net/cjjky/article/details/7478788

这里，就举个简单例子

孙悟空有72变，但是它平时是猴子，遇到情况下，它可以变成蝴蝶等等

因此提供的对象接口为：SunWukong

package com.designmodel.decorator;public interface SunWukong {void change();
}

然后是一个具体的对象：Monkey

package com.designmodel.decorator;public class Monkey implements SunWukong {public void selfIntroduce() {System.out.println("我是孙悟空, 我有72变");}@Overridepublic void change() {System.out.println("我变");}}

接下来是装饰抽象类：Transformations

package com.designmodel.decorator;public class Transformations implements SunWukong {private SunWukong swk;public Transformations(SunWukong swk) {super();this.swk = swk;}@Overridepublic void change() {swk.change();}}

最后是两个具体的装饰对象：

package com.designmodel.decorator;public class XiangFei extends Transformations  {public XiangFei(SunWukong swk) {super(swk);}public void nowIs() {System.out.println("我现在变成了香妃");}
}

package com.designmodel.decorator;public class ButterFly extends Transformations {public ButterFly(SunWukong swk) {super(swk);}public void nowIs() {System.out.println("我现在变成了蝴蝶");}
}

客户端测试：

package com.designmodel.decorator;public class MainApp {public static void main(String[] args) {Monkey monkeyKing = new Monkey();monkeyKing.selfIntroduce();System.out.println("我要变了...");XiangFei xf = new XiangFei(monkeyKing);xf.nowIs();
　　　　 System.out.println("我继续变...");
　　　　 ButterFly bf = new ButterFly(monkeyKing);
　　　　 bf.nowIs();}
}