Java 装饰模式

装饰模式：动态地给一个类添加一些额外的职责，并且在添加这些职责时不会影响该类的执行逻辑，例如通过BufferedInputStream装饰InputStream来添加数据缓冲功能。下面以女人化妆为例来演示装饰模式，如下 :

接口类型 :
package com.umeng.dp.decorator;
/**   
 * @Copyright: Umeng.com, Ltd. Copyright 2011-2015, All rights reserved
 *
 * @Title: WomenFace.java
 * @Package com.umeng.dp.decorator
 * @Description: Face接口
 *
 * @author Honghui He  
 * @version V1.0   
 */

public interface Face {
    public void outting();
}

实现Face接口，原始类型，没有装饰。

package com.umeng.dp.decorator;

/**
 * @Copyright: Umeng.com, Ltd. Copyright 2011-2015, All rights reserved
 * @Title: UglyWomen.java
 * @Package com.umeng.dp.decorator
 * @Description: 自然朴素的女人
 * @author Honghui He
 * @version V1.0
 */

public class NaturalWomen implements Face {

    @Override
    public void outting() {
        System.out.println("==要出门了，朴素的女人不化妆==");
    }

}

打粉底装饰:

package com.umeng.dp.decorator;

/**
 * @Copyright: Umeng.com, Ltd. Copyright 2011-2015, All rights reserved
 * @Title: MashupDecorator.java
 * @Package com.umeng.dp.decorator
 * @Description: 打粉底装饰
 * @author Honghui He
 * @version V1.0
 */

public class MashupDecorator implements Face {

    /**
     * 
     */
    private Face mFace = null;

    /**
     * @Title: MashupDecorator
     * @Description: MashupDecorator Constructor
     * @param face
     */
    public MashupDecorator(Face face) {
        mFace = face;
    }

    @Override
    public void outting() {
        addMashup();
        mFace.outting();
    }

    private void addMashup() {
        System.out.println("  --脸上麻子多,打粉底掩盖下--");
    }

}

画眉毛装饰 :

package com.umeng.dp.decorator;
/**   
 * @Copyright: Umeng.com, Ltd. Copyright 2011-2015, All rights reserved 
 *
 * @Title: EyebrowDecorator.java
 * @Package com.umeng.dp.decorator
 * @Description: 眉毛装饰
 *
 * @author Honghui He  
 * @version V1.0   
 */

public class EyebrowDecorator implements Face {

    /**
     * 
     */
    private Face mFace = null;
    
    public EyebrowDecorator(Face face) {
        mFace = face;
    }

    @Override
    public void outting() {
        paintEyebrow();
        mFace.outting();
    }
    
    private void paintEyebrow() {
        System.out.println("  --画个浓眉毛--");
    }

}

涂口红装饰 :

package com.umeng.dp.decorator;

/**
 * @Copyright: Umeng.com, Ltd. Copyright 2011-2015, All rights reserved
 * @Title: LipstickDecorator.java
 * @Package com.umeng.dp.decorator
 * @Description: 口红装饰
 * @author Honghui He
 * @version V1.0
 */

public class LipstickDecorator implements Face {

    /**
         * 
         */
    private Face mFace = null;

    public LipstickDecorator(Face face) {
        mFace = face;
    }

    @Override
    public void outting() {
        lipstick();
        mFace.outting();
    }

    private void lipstick() {
        System.out.println("  --再给性感的嘴唇涂点口红--");
    }

}

测试 :

package com.umeng.dp.decorator;

/**
 * @Copyright: Umeng.com, Ltd. Copyright 2011-2015, All rights reserved
 * @Title: Test.java
 * @Package com.umeng.dp.decorator
 * @Description: 装饰模式，动态的添加功能
 * @author Honghui He
 * @version V1.0
 */

public class Test {

    public static void main(String[] args) {
        // 不花装的女人
        Face womanFace = new NaturalWomen();
        womanFace.outting();

        // 化粉底
        womanFace = new MashupDecorator(womanFace);
        womanFace.outting();

        // 画眉毛
        womanFace = new EyebrowDecorator(womanFace);
        womanFace.outting();

        // 涂口红
        womanFace = new LipstickDecorator(womanFace);
        womanFace.outting();
    }
}

每添加一种装饰会增加一种职责，会进行相应的操作。

输出 :如下

==要出门了，朴素的女人不化妆==

--脸上麻子多,打粉底掩盖下--

==要出门了，朴素的女人不化妆==

--画个浓眉毛--

--脸上麻子多,打粉底掩盖下--

==要出门了，朴素的女人不化妆==

--再给性感的嘴唇涂点口红--

--画个浓眉毛--

--脸上麻子多,打粉底掩盖下--

==要出门了，朴素的女人不化妆==