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'