装饰器模式

装饰器模式：即客户端先调用的接口A，现在客户端需要在调用接口A的时候，期望A有更多的功能。

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具体代码如下：

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package com.mkf.pattern;public interface InterfaceOne {public void operation();}package com.mkf.pattern.impl;import com.mkf.pattern.InterfaceOne;public class Source implements InterfaceOne {@Overridepublic void operation() {System.out.println("源被调用：" + Source.class.getName());}}package com.mkf.pattern.impl;import com.mkf.pattern.InterfaceOne;public class DecoratorOne implements InterfaceOne {private InterfaceOne io;public DecoratorOne(InterfaceOne io) {super();this.io = io;}@Overridepublic void operation() {System.out.println("DecoratorOne 增强功能前");io.operation();System.out.println("DecoratorOne 增强功能后");}}package com.mkf.pattern.impl;import com.mkf.pattern.InterfaceOne;public class DecoratorTwo implements InterfaceOne {private InterfaceOne io;public DecoratorTwo(InterfaceOne io) {super();this.io = io;}@Overridepublic void operation() {System.out.println("DecoratorTwo 增强功能前");io.operation();System.out.println("DecoratorTwo 增强功能后");}}package com.mkf.pattern.impl;import com.mkf.pattern.InterfaceOne;public class DecoratorThree implements InterfaceOne {private InterfaceOne io;public DecoratorThree(InterfaceOne io) {super();this.io = io;}@Overridepublic void operation() {System.out.println("DecoratorThree 增强功能前");io.operation();System.out.println("DecoratorThree 增强功能后");}}package com.mkf;import com.mkf.pattern.InterfaceOne;import com.mkf.pattern.impl.DecoratorOne;import com.mkf.pattern.impl.DecoratorThree;import com.mkf.pattern.impl.DecoratorTwo;import com.mkf.pattern.impl.Source;public class TestDecorator {/** * @param args */public static void main(String[] args) {Source s = new Source();InterfaceOne io = new DecoratorOne(new DecoratorTwo(new DecoratorThree(s)));io.operation();}}

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输出结果：

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DecoratorOne 增强功能前
DecoratorTwo 增强功能前
DecoratorThree 增强功能前
源被调用：com.mkf.pattern.impl.Source
DecoratorThree 增强功能后
DecoratorTwo 增强功能后
DecoratorOne 增强功能后

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