Java 装饰者设计模式

1、首先定义一个接口

public interface Worker {
 public void doSomeWork();
}

2、定义一个木匠类

public class Carpenter implements Worker{

 @Override
 public void doSomeWork() {
  System.out.println("修门窗");
 }
}

 

3、定义一个水管工类

public class Plumber implements Worker{

 @Override
 public void doSomeWork() {
  System.out.println("修水管");
 }
}

 

4、这儿是关键，定义一个装饰者类

public class AWorker implements Worker{

 private Worker worker = null;
 
 public AWorker(Worker worker){
  this.worker = worker;
 }
 @Override
 public void doSomeWork() {
  System.out.println("您好");
  worker.doSomeWork();
 }
}

 

5、测试类

public class Test {
 public static void main(String args [] ){
  Carpenter carpenter = new Carpenter();
  AWorker aWorker1 = new AWorker(carpenter);
  aWorker1.doSomeWork();
  
  Plumber plumber = new Plumber();
  AWorker aWorker2 = new AWorker(plumber);
  aWorker2.doSomeWork();
 }
}

 

6、类似的可以再定义一个装饰者类

public class BWorker implements Worker{

 private Worker worker = null;
 
 public BWorker(Worker worker){
  this.worker = worker;
 }
 @Override
 public void doSomeWork() {
  System.out.println("戴鞋套");
  worker.doSomeWork();
 }
}

以上知识是从mars老师的视屏中学习的：http://www.marsdroid.org