Java 学习笔记之 线程sleep方法

线程sleep方法：

单主线程使用sleep：

Main线程差了2000毫秒。

public class MainSleepThread extends Thread{
    @Override
    public void run() {

        try {
            System.out.println(this.currentThread().getName() + " begin");
            Thread.sleep(2000);
            System.out.println(this.currentThread().getName() + " end");
        } catch (InterruptedException e) {
            e.printStackTrace();
        }

    }
}

public class ThreadRunMain {
    public static void main(String[] args) {

        testMainSleepThread();

    }

    public static void testMainSleepThread(){
        MainSleepThread mst = new MainSleepThread();
        System.out.println("begin = " + System.currentTimeMillis());
        mst.run();
        System.out.println("end = " + System.currentTimeMillis());
    }
}

运行结果：

非Main线程使用sleep：

Main线开始和结束时间一样，而非主线程差了2000毫秒。

public class ThreadSleepThread extends Thread {
    @Override
    public void run() {
        try {
            System.out.println("run threadName= " + this.currentThread().getName() + " begin = " + System.currentTimeMillis());
            Thread.sleep(2000);
            System.out.println("run threadName= " + this.currentThread().getName() + " end = " + System.currentTimeMillis());
        } catch (InterruptedException e) {
            e.printStackTrace();
        }
    }
}

public class ThreadRunMain {
    public static void main(String[] args) {
        testThreadSleepThread();
    }

    public static void testThreadSleepThread(){
        ThreadSleepThread tst = new ThreadSleepThread();
        System.out.println("begin = " + System.currentTimeMillis());
        tst.start();
        System.out.println("end = " + System.currentTimeMillis());
    }
}

运行结果：