- sleep(时间)指定当前线程阻塞的毫秒数
- sleep存在异常InterruptedException
- sleep时间达到后线程进入就绪状态
- sleep可以模拟网络延时,倒计时等
- 每一个对象都有一个锁,sleep不会释放锁
代码:
模拟买票:
package com.qiu.state;
import com.qiu.demo01.TestThreadDemo04;
//模拟网络延时:放大问题的发生性
public class TestSleep implements Runnable{
private int ticketsNum = 10;
@Override
public void run() {
while(true){
if (ticketsNum<=0){
break;
}
//模拟延时
try {
Thread.sleep(200);
} catch (Exception e) {
e.printStackTrace();
}
System.out.println(Thread.currentThread().getName()+"-->拿到了"+ticketsNum--+"票");
}
}
public static void main(String[] args) {
TestSleep ticket = new TestSleep();
new Thread(ticket,"黄牛").start();
new Thread(ticket,"老师").start();
new Thread(ticket,"我").start();
}
}
模拟倒计时(模拟系统时间更新)
代码:
package com.qiu.state;
import java.text.SimpleDateFormat;
import java.util.Date;
public class TestSleep02 {
public static void main(String[] args) throws InterruptedException {
//打印系统当前时间
Date startTime = new Date(System.currentTimeMillis());
while(true){
Thread.sleep(1000);
System.out.println(new SimpleDateFormat("HH:mm:ss").format(startTime));
startTime=new Date(System.currentTimeMillis());//更新当前时间
}
}
public static void tendown() throws InterruptedException {
int num = 10;
while(true){
Thread.sleep(1000);
System.out.println(num--);
if (num<0){
break;
}
}
}
}