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。

复制代码 代码如下:

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：

复制代码 代码如下:

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'