结构模式之装饰模式

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装饰模式就是动态的增加责任，示例代码：

package com.djk.design.struct.decor;public interface Food {void description();}

package com.djk.design.struct.decor;public class Cake implements Food{private Food food;public Cake(Food food) {super();this.food = food;}@Overridepublic void description() {if (null != food){food.description();}System.out.println("蛋糕");}}

package com.djk.design.struct.decor;public class ChocolateCake implements Food{private Food food;public ChocolateCake(Food food) {super();this.food = food;}@Overridepublic void description() {if (null != food){food.description();}System.out.println("巧克力味");}}

package com.djk.design.struct.decor;public class ZhiShiCake implements Food{private Food food;public ZhiShiCake(Food food) {super();this.food = food;}@Overridepublic void description() {if (null != food){food.description();}System.out.println("芝士");}}

package com.djk.design.struct.decor;public class Client {public static void main(String[] args) {Food food = new Cake(new ChocolateCake(new ZhiShiCake(null)));food.description();}}

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