JAVA5---Exchange使用

该类用于处理，偶数个线程之间的数据交换。比如有两个线程A和B，当A开始运行并准备就绪数据后，它就会等待B开始运行，直到B准备好数据，两个线程马上开始交互数据。如果有三个线程将导致死锁。例子如下：

开启一个缓冲线程池，启动两个线程交换数据，每个线程准备时间采用sleep一段时间来模拟。代码如下：

import java.util.concurrent.Exchanger;import java.util.concurrent.ExecutorService;import java.util.concurrent.Executors;public class ExchangerTest {/** * @param args */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 = "data1";System.out.println("线程" + Thread.currentThread().getName() + "正在准备把数据" + 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){e.printStackTrace();}}});service.execute(new Runnable(){public void run() {try{String data2 = "data2";System.out.println("线程" + Thread.currentThread().getName() + "正在准备把数据" + data2 + "换出去");Thread.sleep((long) (Math.random()*10000));String data1 = (String) exchanger.exchange(data2);System.out.println("线程" + Thread.currentThread().getName() + "换回的数据为：" + data1);}catch(Exception e){e.printStackTrace();}}});service.shutdown();}}