10个线程，累加一个数，加到1000后输出

 

public static void main(String[] args) {
        AtomicInteger a = new AtomicInteger(0);
        CountDownLatch countDownLatch = new CountDownLatch(1);
        Semaphore semaphore = new Semaphore(1);
        for (int i = 0; i < 10; i++) {
            Thread t1 = new Thread(() -> {
                for (; ; ) {try {
                        semaphore.acquire();
                    } catch (InterruptedException e) {
                        e.printStackTrace();
                    }
　　　　　　　　　　　　int ret=a.get();
                    if (ret == 1000) {
                        countDownLatch.countDown();
                        break;
                    } else {
                        ret = a.incrementAndGet();
                        System.out.println(ret);
                    }
                    semaphore.release();
                }
            });
            t1.setDaemon(true);
            t1.start();
        }
        try {
            countDownLatch.await();
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }