java实现装饰器模式（Decorator Pattern）

package com.designpattern.decoratorPattern;

/**
 * Component 组件 抽象角色
 * @author zhongtao on 2018/10/23
 */
public interface House {
 /**
  * 装饰风格
  */
 void style();
}

/**
 * 具体组件
 * @author zhongtao on 2018/10/23
 */
public class ChineseStyle implements House {
 @Override
 public void style() {
  System.out.println("中式风格装修");
 }
}

/**
 * 具体组件
 * @author zhongtao on 2018/10/23
 */
public class EuropeanStyle implements House {
 @Override
 public void style() {
  System.out.println("欧式风格装修");
 }
}

package com.designpattern.decoratorPattern;

/**
 * 抽象装饰类
 *
 * @author zhongtao on 2018/10/23
 */
public class HouseDecorator implements House {

 public House house;

 public HouseDecorator(House house) {
  this.house = house;
 }

 @Override
 public void style() {
  house.style();
 }
}

package com.designpattern.decoratorPattern;

/**
 * 具体装饰类
 *
 * @author zhongtao on 2018/10/23
 */
public class RedDecorator extends HouseDecorator {

 public RedDecorator(House house) {
  super(house);
 }

 public void style() {
  this.house.style();
  System.out.println("红色装饰墙");
 }
}

package com.designpattern.decoratorPattern;

import org.junit.Test;

/**
 * 测试装饰器模型
 *
 * @author zhongtao on 2018/10/22
 */
public class DecoratorPatternTest {
 /**
  * 测试装饰器模型
  */
 @Test
 public void testDecoratorPattern(){
  ChineseStyle chineseStyle = new ChineseStyle();
  House redChineseStyle = new RedDecorator(new ChineseStyle());
  House redEuropeanStyle = new RedDecorator(new EuropeanStyle());

  System.out.println("中式装修");
  chineseStyle.style();

  System.out.println("\n中式加红色墙");
  redChineseStyle.style();

  System.out.println("\n欧式加红色墙");
  redEuropeanStyle.style();

 }
}