CountDownLatch 模拟高并发

// countdownlatch 模拟高并发
    public static void main(String[] args) throws InterruptedException {
        CountDownLatch cdl = new CountDownLatch(10);
        for (int i = 0; i < 10; i++) {
            int cnt = 0;
            new Thread(()->{
                try {
                    System.out.println("开始"+Thread.currentThread().getName());
                    // 程序等待，直至CountDownLatch的数归零
                    cdl.await();
                    System.out.println(Thread.currentThread().getName()+"执行"+ (cnt +1));
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }

            }).start();

        }
        Thread.sleep(5000);
        for (int i = 0; i < 10; i++) {
            // 将CountDownLatch的数减一
            cdl.countDown();
        }


    }

执行结果：

开始Thread-1
开始Thread-2
开始Thread-0
开始Thread-3
开始Thread-4
开始Thread-5
开始Thread-6
开始Thread-7
开始Thread-8
开始Thread-9
Thread-2执行1
Thread-5执行1
Thread-7执行1
Thread-8执行1
Thread-4执行1
Thread-3执行1
Thread-0执行1
Thread-1执行1
Thread-9执行1
Thread-6执行1