倒计数器:CountDownLatch

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public class CountDownLatchDemo implements Runnable{ static final CountDownLatch end = new CountDownLatch(10); static final CountDownLatchDemo demo = new CountDownLatchDemo(); @Override public void run() { try{ Thread.sleep(new Random().nextInt(10)*1000); System.out.println("check complete"); end.countDown(); }catch (InterruptedException e){ e.printStackTrace(); } } public static void main(String[] args) { ExecutorService executorService = Executors.newFixedThreadPool(10); for(int i =0;i<10;i++){ executorService.submit(demo); } try { end.await(); } catch (InterruptedException e) { throw new RuntimeException(e); } System.out.println("Finish!"); executorService.shutdown(); } }