浏阳疫情发布/逆冬seo

volatile关键字的应用场景主要是一写多读，因为volatile只能对多线程处理变量的可见性，并不能保证原子性，所以并发修改变量的时候还是要用synchronized加锁处理，例子

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package com.cmbchina.ccd.oa.cchrapi.juc;/*** @description: volatile关键字* @author: kongwc* @create: 2020-03-19*/
public class VolatileDemo {private static volatile int total = 10;public static void main(String[] args) {Ticket ticket = new Ticket();Ticket1 ticket1 = new Ticket1();Thread thread1 = new Thread(ticket1);thread1.start();for(int i=0; i<100; i++){Thread thread = new Thread(ticket);thread.start();}}static class Ticket implements Runnable{@Overridepublic void run() {try {Thread.sleep(1500);} catch (InterruptedException e) {e.printStackTrace();}System.out.println("total is:" + total + "--------时间为:" + System.currentTimeMillis());}}static class Ticket1 implements Runnable{@Overridepublic void run() {try {Thread.sleep(1500);} catch (InterruptedException e) {e.printStackTrace();}total--;System.out.println("修改后打印时间为:" + System.currentTimeMillis() + "--------时间为:" + System.currentTimeMillis());}}
}

如果不加volatile关键字，对total做修改，并不能保证其他线程及时查询到修改后的变量