java线程中Exchanger使用

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　　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 = &quot;abc&quot;;
@Override
public void run() {
try {
System.out.println(Thread.currentThread().getName() +&quot;正在把数据 &quot;+ data1+ &quot; 交换出去&quot; );
Thread.sleep((long) (Math.random()*1000));
String data2 = (String) exchanger.exchange(data1);
System.out.println(Thread.currentThread().getName() + &quot;交换数据 到  &quot;+ data2);
} catch (InterruptedException e) {
e.printStackTrace();
}
}
});
executor.execute(new Runnable() {
String data1 = &quot;def&quot;;
@Override
public void run() {
try {
System.out.println(Thread.currentThread().getName() +&quot;正在把数据 &quot;+ data1+ &quot; 交换出去&quot; );
Thread.sleep((long) (Math.random()*1000));
String data2 = (String) exchanger.exchange(data1);
System.out.println(Thread.currentThread().getName() + &quot;交换数据 到  &quot;+ 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