線程的工具類（Exchange）

public class Exchanger<V>extends Object

可以在對中對元素進行配對和交換的線程的同步點。每個線程將條目上的某個方法呈現給 exchange 方法，與伙伴線程進行匹配，并且在返回時接收其伙伴的對象。Exchanger 可能被視為 SynchronousQueue 的雙向形式。Exchanger 可能在應用程序（比如遺傳算法和管道設計）中很有用。?

實例：

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

/**
* 線程間的交換數據
*
* @author wangyi
* @version 1.0 <br />
* <a href="www.baidu.com">百度一下</a>
*/
public class ExchagerTest {
public static void main(String[] args) {
ExecutorService service = Executors.newCachedThreadPool();
Exchanger<String> exchange = new Exchanger<String>();
service.execute(new MyThread<String>("愛情", exchange, "愛情"));
service.execute(new MyThread<String>("關曉彤", exchange, "關曉彤"));
service.shutdown();

}

static class MyThread<T> extends Thread {
private T data;
private Exchanger<T> exchange;

public MyThread(T data, Exchanger<T> exchange, String name) {
this.data = data;
this.exchange = exchange;
setName(name);
}

@Override
public void run() {
System.out.println(getName() + "正準備把" + data + "交換出去");
try {
Thread.sleep((int) (Math.random() * 10000));
T datas = exchange.exchange(data);
System.out.println(getName() + "換回的為：" + datas);
} catch (Exception e) {
e.printStackTrace();
}

}
}

}