java并发JUC工具包AtomicInteger原子整型语法基础

//初始值为0的atomicInteger对象
AtomicInteger atomicInteger = new AtomicInteger();  
//初始值为200的atomicInteger对象
AtomicInteger atomicInteger = new AtomicInteger(200);
int currentValue = atomicInteger.get();         //100
atomicInteger.set(2453);                        //现在的值是 2453

public class Main {
    public static void main(String[] args) {
        //初始值为100的atomic Integer
        AtomicInteger atomicInteger = new AtomicInteger(100);
        System.out.println(atomicInteger.addAndGet(2));         //加2并返回102
        System.out.println(atomicInteger);                      //102
        System.out.println(atomicInteger.getAndAdd(2));         //先获取102，再加2
        System.out.println(atomicInteger);                      //104
        System.out.println(atomicInteger.incrementAndGet());    //加1再获取105   
        System.out.println(atomicInteger);                      //105   
        System.out.println(atomicInteger.getAndIncrement());    //先获取105再加1
        System.out.println(atomicInteger);                      //106
        System.out.println(atomicInteger.decrementAndGet());    //减1再获取105
        System.out.println(atomicInteger);                      //105
        System.out.println(atomicInteger.getAndDecrement());    //先获取105，再减1
        System.out.println(atomicInteger);                      //104
    }
}

boolean compareAndSet(int expect, int update)

import java.util.concurrent.atomic.AtomicInteger;
public class Main {
    public static void main(String[] args) {
        //初始值为100的atomic Integer
        AtomicInteger atomicInteger = new AtomicInteger(100);
        //当前值100 = 预期值100，所以设置atomicInteger=110
        boolean isSuccess = atomicInteger.compareAndSet(100,110);  
        System.out.println(isSuccess);      //输出结果为true表示操作成功
        //当前值110 = 预期值100？不相等，所以atomicInteger仍然等于110
        isSuccess = atomicInteger.compareAndSet(100,120);  
        System.out.println(isSuccess);      //输出结果为false表示操作失败
    }
}