java5 Exchanger数据交换

Java并发API提供了一种允许2个并发任务间相互交换数据的同步应用。更具体的说，Exchanger类允许在2个线程间定义同步点，当2个线程到达这个点，他们相互交换数据类型，使用第一个线程的数据类型变成第二个的，然后第二个线程的数据类型变成第一个的。

用于实现两个人之间的数据交换，每个人在完成一定的事务后想与对方交换数据，第一个先拿出数据的人将一直等待第二个人拿着数据到来时，才能彼此交换数据。

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package com.ljq.test.thread;   import java.util.concurrent.Exchanger; import java.util.concurrent.ExecutorService; import java.util.concurrent.Executors;   public class ExchangerTest {       public static void main(String[] args) {                   ExecutorService service = Executors.newCachedThreadPool();         final Exchanger exchanger = new Exchanger();         service.execute(new Runnable(){             public void run() {                 try {                                     String data1 = "张三";                     System.out.println("线程" + Thread.currentThread().getName() + "正在把数据'" + data1 +"'换出去");                     Thread.sleep((long)(Math.random()*10000));                     String data2 = (String)exchanger.exchange(data1);                     System.out.println("线程" + Thread.currentThread().getName() + "换回的数据为'" + data2+"'");                 }catch(Exception e){                                       }             }           });         service.execute(new Runnable(){             public void run() {                 try {                                   String data1 = "李四";                     System.out.println("线程" + Thread.currentThread().getName() + "正在把数据'" + data1 +"'换出去");                     Thread.sleep((long)(Math.random()*10000));                                      String data2 = (String)exchanger.exchange(data1);                     System.out.println("线程" + Thread.currentThread().getName() + "换回的数据为'" + data2 + "'");                 }catch(Exception e){                                       }                           }           });         } }

返回结果：

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线程pool-1-thread-1正在把数据'张三'换出去 线程pool-1-thread-2正在把数据'李四'换出去 线程pool-1-thread-1换回的数据为'李四' 线程pool-1-thread-2换回的数据为'张三'