java线程工程

CountDownLatch

 

public static void main(String[] args) {
        final CountDownLatch c = new CountDownLatch(10);
        final ExecutorService executorService = Executors.newCachedThreadPool();
        for(int i=0;i<10;i++){
            Runnable run = new Runnable() {
                public void run() {
                    System.out.println(Thread.currentThread().getName()+"开始干活");
                    try {
                        TimeUnit.MILLISECONDS.sleep(5000L);
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
                    System.out.println(Thread.currentThread().getName()+"干活结束");
                    c.countDown();
                }
            };
            executorService.submit(run);
        }
        try {
            c.await();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        executorService.shutdown();
        System.out.println("大家都干完活了");
    }