演示调用sleep方法，锁是否释放

最新推荐文章于 2024-09-01 08:44:29 发布

青春1314

最新推荐文章于 2024-09-01 08:44:29 发布

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分类专栏： 01 java并发编程

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本文通过两个Java线程的实例，演示了当一个线程调用sleep方法时，是否释放了同步锁。其中一个线程在获得锁后调用sleep方法暂停执行，另一个线程尝试在同一锁上获取资源。

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/**
 * 演示调用sleep方法，锁是否释放
 */
public class SleepLock {
    private Object lock = new Object();

    private class ThreadSleep extends Thread{
        @Override
        public void run() {
            String threadName = Thread.currentThread().getName();
            System.out.println(threadName + " will take the lock!");
            try {
                synchronized(lock) {
                    System.out.println(threadName + " is taking the lock!");
                    Thread.sleep(5000);
                    System.out.println(threadName + "finish the work!");
                }
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }

    private class ThreadNotSleep extends Thread{
        @Override
        public void run() {
            String threadName = Thread.currentThread().getName();
            System.out.println(threadName + " will take the lock time = " + System.currentTimeMillis());
            synchronized(lock) {
                System.out.println(threadName + " is taking the lock time = " + System.currentTimeMillis());
                System.out.println(threadName + " finish the work!");
            }
        }
    }


    public static void main(String[] args) {
        SleepLock sleepTest = new SleepLock();
        Thread threadA = sleepTest.new ThreadSleep();
        threadA.setName("ThreadSleep");
        Thread threadB = sleepTest.new ThreadNotSleep();
        threadB.setName("ThreadNotSleep");
        threadA.start();
        try {
            Thread.sleep(1000);
            System.out.println(" Main slept!");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        threadB.start();
    }
}