线程休眠

线程休眠

• sleep(时间)指定当前线程阻塞的毫秒数

• sleep存在异常InteruptedException

• 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！

package com.hua.demo;

//模拟网络延时：放大问题的发生性
public class TestSleep implements Runnable{

    //票数
    private int ticketNums = 10;

    @Override
    public void run() {
        while(true){
            if (ticketNums<=0){
                break;
            }
            //模拟延时
            try {
                Thread.sleep(200);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
            System.out.println(Thread.currentThread().getName()+"买到了第"+ticketNums--+"张票");
        }
    }

    public static void main(String[] args) {

        TestSleep ticket = new TestSleep();

        new Thread(ticket,"小明").start();
        new Thread(ticket,"张三").start();
        new Thread(ticket,"黄牛").start();
    }
}

package com.hua.demo;

import java.text.SimpleDateFormat;
import java.util.Date;

public class TestSleep2{

    public static void main(String[] args) {
        //打印当前系统时间
        Date startTime = new Date(System.currentTimeMillis());//获取系统当前时间

        while (true) {
            try {
                new Thread().sleep(1000);
                System.out.println(new SimpleDateFormat("HH:mm:ss").format(startTime));
                startTime = new Date(System.currentTimeMillis());//更新系统当前时间
            } catch (InterruptedException e) {
                e.printStackTrace();
            }
        }
    }
    //模拟倒计时
    public static void tenDown() throws InterruptedException {
        int num = 10;
        while(true){
            new Thread().sleep(1000);
            System.out.println(num--);
            if (num<0){
                break;
            }
        }
    }
}

 

标签：System,休眠,线程,new,Date,sleep,public
来源： https://www.cnblogs.com/1982king/p/15902590.html