Exchanger 线程之间数据传输

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java Exchanger类用于在线程之间传输数据

class ExchangeOne implements Runnable{    Exchanger<String> exchanger;    public ExchangeOne(Exchanger<String> exchanger){        this.exchanger=exchanger;    }    @Override    public void run() {        try {            String one="one";            System.out.println("thread id:"+Thread.currentThread().getId()+",before value:one,date:"+new Date());            String afterValue=exchanger.exchange(one);            System.out.println("thread id:"+Thread.currentThread().getId()+",after value:"+afterValue+",date:"+new Date());        } catch (InterruptedException e) {            e.printStackTrace();        }    }}

class ExchangeTwo implements Runnable{    Exchanger<String> exchanger;    public ExchangeTwo(Exchanger<String> exchanger){        this.exchanger=exchanger;    }    @Override    public void run() {        try {            Thread.sleep(2000);            String one="two";            System.out.println("thread id:"+Thread.currentThread().getId()+",before value:two,date:"+new Date());            String afterValue=exchanger.exchange(one);            System.out.println("thread id:"+Thread.currentThread().getId()+",after value:"+afterValue+",date:"+new Date());        } catch (InterruptedException e) {            e.printStackTrace();        }    }}

 public static void main(String[] args) {        Exchanger<String> exchanger=new Exchanger<>();        new Thread(new ExchangeOne(exchanger)).start();        new Thread(new ExchangeTwo(exchanger)).start();    }

当ExchangeOne线程调用 exchange方法时，会被阻塞，直到 ExchangeTwo线程调用 exchange才会继续往下执行

执行结果：

thread id:11, before value:one, date:Wed Jul 19 16:07:15 GMT+08:00 2017
thread id:12, before value:two, date:Wed Jul 19 16:07:17 GMT+08:00 2017
thread id:12, after value:one, date:Wed Jul 19 16:07:17 GMT+08:00 2017
thread id:11, after value:two, date:Wed Jul 19 16:07:17 GMT+08:00 2017

thread11第一次运行时 second是 15，交换数据后是 17，因为 thread12休眠了2秒

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