Java 多线程、并发和睡眠未按预期工作

我有一个非常简单的方案.下面的方法try 访问锁，等待1秒，最终释放锁.

private final Lock lock = new ReentrantLock();

public void lockAndWait() {

    logger.info("I {} am here", Thread.currentThread().getName());

    lock.lock();

    try {

        logger.info("I {} got the lock", Thread.currentThread().getName());

        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
            throw new RuntimeException(e);
        }

    } finally {
        lock.unlock();
    }
}

我正在运行以下测试:

@Test
public void lockTest() {
    for (int i = 0; i < 10; i++) {
        new Thread(() -> lockAndWait()).start();
    }
}

我得到了以下日志(log)输出:

12-10-2023 17:11:04 [Thread-2       ] INFO   I Thread-2 am here
12-10-2023 17:11:04 [Thread-1       ] INFO   I Thread-1 am here
12-10-2023 17:11:04 [Thread-6       ] INFO   I Thread-6 am here
12-10-2023 17:11:04 [Thread-4       ] INFO   I Thread-4 am here
12-10-2023 17:11:04 [Thread-8       ] INFO   I Thread-8 am here
12-10-2023 17:11:04 [Thread-7       ] INFO   I Thread-7 am here
12-10-2023 17:11:04 [Thread-5       ] INFO   I Thread-5 am here
12-10-2023 17:11:04 [Thread-2       ] INFO   I Thread-2 got the lock
12-10-2023 17:11:04 [Thread-3       ] INFO   I Thread-3 am here
12-10-2023 17:11:04 [Thread-10      ] INFO   I Thread-10 am here
12-10-2023 17:11:04 [Thread-9       ] INFO   I Thread-9 am here

我不明白为什么只有一个线程，在本例中是Thread-2，可以访问锁.我原以为其余的线程都在等待lock.lock();语句，一旦Thread-2释放了锁，其中一个线程就会得到它，直到所有线程都释放.如果我删除Thread.sleep(1000);行，我期望发生的事情就会发生，但我不明白为什么.

我遗漏了什么？

SOLUTION个

根据Dhrubajyoti Gogoi的回答，我已经修改了我的测试方法，现在正在按预期工作.

@Test
public void policyUsageTest() throws InterruptedException {

    List<Thread> threads = new ArrayList<>();

    for (int i = 0; i < 10; i++) {
        Thread thread = new Thread(() -> lockAndWait());
        thread.start();
        threads.add(thread);
    }

    for (Thread thread : threads) {
        thread.join();
    }
}

Output个

12-10-2023 18:08:14 [Thread-1       ] INFO   I Thread-1 am here
12-10-2023 18:08:14 [Thread-5       ] INFO   I Thread-5 am here
12-10-2023 18:08:14 [Thread-2       ] INFO   I Thread-2 am here
12-10-2023 18:08:14 [Thread-9       ] INFO   I Thread-9 am here
12-10-2023 18:08:14 [Thread-4       ] INFO   I Thread-4 am here
12-10-2023 18:08:14 [Thread-7       ] INFO   I Thread-7 am here
12-10-2023 18:08:14 [Thread-3       ] INFO   I Thread-3 am here
12-10-2023 18:08:14 [Thread-8       ] INFO   I Thread-8 am here
12-10-2023 18:08:14 [Thread-10      ] INFO   I Thread-10 am here
12-10-2023 18:08:14 [Thread-6       ] INFO   I Thread-6 am here
12-10-2023 18:08:14 [Thread-1       ] INFO   I Thread-1 got the lock
12-10-2023 18:08:15 [Thread-2       ] INFO   I Thread-2 got the lock
12-10-2023 18:08:16 [Thread-9       ] INFO   I Thread-9 got the lock
12-10-2023 18:08:17 [Thread-5       ] INFO   I Thread-5 got the lock
12-10-2023 18:08:18 [Thread-4       ] INFO   I Thread-4 got the lock
12-10-2023 18:08:19 [Thread-3       ] INFO   I Thread-3 got the lock
12-10-2023 18:08:20 [Thread-7       ] INFO   I Thread-7 got the lock
12-10-2023 18:08:21 [Thread-8       ] INFO   I Thread-8 got the lock
12-10-2023 18:08:22 [Thread-10      ] INFO   I Thread-10 got the lock
12-10-2023 18:08:23 [Thread-6       ] INFO   I Thread-6 got the lock