java线程中Exchanger使用

有时我们须要对元素进行配对和交换线程的同步点，使用exchange方法 返回其伙伴的对象，这时我们就须要使用线程类中的Exchanger类了，

我通过一个实例 来简单说明一下他的用法及其作用：

import java.util.concurrent.Exchanger;
import java.util.concurrent.ExecutorService;
import java.util.concurrent.Executors;

public class TestExchanger {

/**
* @param args
*/
public static void main(String[] args) {
ExecutorService executor = Executors.newCachedThreadPool();
final Exchanger<String> exchanger = new Exchanger<String>();
executor.execute(new Runnable() {
String data1 = "abc";
@Override
public void run() {
try {
System.out.println(Thread.currentThread().getName() +"正在把数据 "+ data1+ " 交换出去" );
Thread.sleep((long) (Math.random()*1000));

String data2 = (String) exchanger.exchange(data1);
System.out.println(Thread.currentThread().getName() + "交换数据 到  "+ data2);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});

executor.execute(new Runnable() {
String data1 = "def";
@Override
public void run() {
try {
System.out.println(Thread.currentThread().getName() +"正在把数据 "+ data1+ " 交换出去" );
Thread.sleep((long) (Math.random()*1000));

String data2 = (String) exchanger.exchange(data1);
System.out.println(Thread.currentThread().getName() + "交换数据 到  "+ data2);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
}

}

运行完毕之后；你会发现数据完毕交换

pool-1-thread-1正在把数据 abc 交换出去

pool-1-thread-2正在把数据 def 交换出去

pool-1-thread-2交换数据 到 abc

pool-1-thread-1交换数据 到 def