java多线程-Thread的sleep方法

public static native void sleep(long millis) throws InterruptedException;

sleep是本地静态方法。
sleep的作用是让线程进入TIME_WAITING状态，参数是多少毫秒。

class Test {
    public static void main(String[] args){
        Thread thread = new Thread(()->{
            try {
                Thread.sleep(2000);
                System.out.println("over");
            } catch (InterruptedException e) {
                System.out.println("interrupt");
            }
        });
        thread.start();
    }
}

/**
 结果：2秒后看到over
 */

sleep可被interrupt打断，抛出InterruptedException。

class Test {
    public static void main(String[] args){
        Thread thread = new Thread(()->{
            try {
                Thread.sleep(2000);
                System.out.println("over");
            } catch (InterruptedException e) {
                System.out.println("interrupt");
            }
        });
        thread.start();
        thread.interrupt();
    }
}

/**
 结果：立刻看到interrupt
 */

注意：sleep方法并不释放锁。