java sleep()和wait()的区别

import java.text.SimpleDateFormat;

import java.util.Date;

public class TestSleepAndWait {

public static void main(String[] args) {

new Thread1().start();

try {

Thread.sleep(100);

} catch (InterruptedException e) {

e.printStackTrace();

}

new Thread2().start();

}

}

class Thread1 extends Thread{

private void sout(String s){

System.out.println(s+" "+new SimpleDateFormat("HH:mm:ss:SS").format(new Date()));

}

@Override

public void run() {

sout("enter Thread1.run");

synchronized (TestSleepAndWait.class){//wait只能在同步代码块或者同步方法中使用

sout("Thread1 is going to wait");

try {

TestSleepAndWait.class.wait(); // 这里只能使用持有锁TestSleepAndWait.class.wait()，使用其他对象则报错java.lang.IllegalMonitorStateException

} catch (InterruptedException e) {

e.printStackTrace();

}

sout("after waiting, thread1 is going on");

sout("thread1 is over");

}

}

}

class Thread2 extends Thread{

private void sout(String s){

System.out.println(s+" "+new SimpleDateFormat("HH:mm:ss:SS").format(new Date()));

}

@Override

public void run() {

sout("enter Thread2.run");

synchronized (TestSleepAndWait.class){//wait只能在同步代码块或者同步方法中使用

sout("Thread2 is going to notify");

TestSleepAndWait.class.notify(); 这里只能使用持有锁TestSleepAndWait.class

sout("thread2 is going to sleep 10ms");

try {

Thread.sleep(10);

} catch (InterruptedException e) {

e.printStackTrace();

}

sout("after sleeping, thread2 is going on");

sout("thread2 is over");

}

}

}