Java Thread.sleep方法

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1. Thread.sleep方法

sleep方法挂起当前线程，直到一段时间后再次进入等待状态。

public class ThreadSleep extends Thread {

    @Override
    public void run() {
        System.out.println("ThreadSleep begin " + System.currentTimeMillis());
        try {
            Thread.sleep(1000);
        } catch (InterruptedException e) {
        }		
        System.out.println("ThreadSleep end " + System.currentTimeMillis());
    }

    public static void main(String[] args) {
        new ThreadSleep().start();
    }

}

输出

ThreadSleep begin 1543818092774
ThreadSleep end 1543818093774

2. sleep方法与锁对象

sleep()方法并不会放弃锁对象。

public class ThreadSleepLock extends Thread {
    Object lock;

    public ThreadSleepLock(Object lock) {
        this.lock = lock;
    }

    @Override
    public void run() {
        synchronized (lock) {
            System.out.println("ThreadSleepLock begin " + System.currentTimeMillis());
            try {
                Thread.sleep(2000);
            } catch (InterruptedException e) {
            }
            System.out.println("ThreadSleepLock end " + System.currentTimeMillis());
        }
    }

    public static void main(String[] args) {
        Object lock = new Object();
        new ThreadSleepLock(lock).start();

        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
        }

        synchronized (lock) {
            System.out.println("main end " + System.currentTimeMillis());			
        }
    }

}

输出

ThreadSleepLock begin 1543818504341
ThreadSleepLock end 1543818506341
main end 1543818506341

3. sleep方法与interrupt方法

如果线程在挂起状态，调用线程的interrupt方法会发生InterruptedException异常。

public class ThreadSleepInterrupt extends Thread {

    @Override
    public void run() {
        System.out.println("ThreadSleepInterrupt begin " + System.currentTimeMillis());
        try {
            Thread.sleep(2000);
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
        System.out.println("ThreadSleepInterrupt end " + System.currentTimeMillis());
    }

    public static void main(String[] args) {
        Thread t = new ThreadSleepInterrupt();
        t.start();

        try {
            Thread.sleep(100);
        } catch (InterruptedException e) {
        }

        t.interrupt();
    }

}

输出

ThreadSleepInterrupt begin 1543818907713
java.lang.InterruptedException: sleep interrupted
ThreadSleepInterrupt end 1543818907814
    at java.lang.Thread.sleep(Native Method)
    at com.blog.demo.thread.ThreadSleepInterrupt.run(ThreadSleepInterrupt.java:9)

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