· CAS_Demo

 1 package com.miaoshaProject.demo;
 2 
 3 import java.util.concurrent.atomic.AtomicInteger;
 4 import java.util.concurrent.locks.ReentrantLock;
 5 
 6 /**
 7  * @Author wangshuo
 8  * @Date 2022/5/9, 10:23
 9  * Java提供的原子操作类
10  * AtomicInteger对象实现了CAS，所以加不加锁都没有出现脏读幻读重复读
11  */
12 public class CAS_Demo {
13 
14     public /*synchronized*/ static void main(String[] args) {
15         /*
16         AtomicLong atomicLong = new AtomicLong();
17          */
18         //创建Atomic原子操作对象
19         //ReentrantLock lock = new ReentrantLock();
20         AtomicInteger atomicInteger = new AtomicInteger();
21 
22         //lock.lock();
23         //开启五个线程，每个线程执行十次自增
24         for (int i = 0; i < 5; i++) {
25 
26             new Thread(() -> {
27 
28                 for (int j = 0; j < 10; j++) {
29                     //自增并输出
30                     System.out.println(atomicInteger.incrementAndGet());
31                 }
32             }).start();
33         }
34         //lock.unlock();
35     }
36 }