原子引用

原子引用

原子引用解决ABA问题，解决思路：乐观锁

package com.sw.cas;


import java.util.concurrent.TimeUnit;
import java.util.concurrent.atomic.AtomicStampedReference;

/**
 * @Author suaxi
 * @Date 2021/2/21 21:29
 * 原子引用解决ABA问题
 */
public class casTest01 {

    static AtomicStampedReference<Integer> atomicStampedReference = new AtomicStampedReference<>(5, 1);

    public static void main(String[] args) {
        new Thread(() ->{
            int stamp = atomicStampedReference.getStamp();
            System.out.println("A1--->"+stamp);

            try {
                TimeUnit.SECONDS.sleep(2);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            System.out.println(atomicStampedReference.compareAndSet(5, 6,
                    atomicStampedReference.getStamp(), atomicStampedReference.getStamp() + 1));
            System.out.println("A2--->"+atomicStampedReference.getStamp());

            System.out.println(atomicStampedReference.compareAndSet(6, 5,
                    atomicStampedReference.getStamp(), atomicStampedReference.getStamp() + 1));
            System.out.println("A3--->"+atomicStampedReference.getStamp());

        },"A").start();

        new Thread(() ->{
            int stamp = atomicStampedReference.getStamp();
            System.out.println("B1--->"+stamp);

            try {
                TimeUnit.SECONDS.sleep(2);
            } catch (InterruptedException e) {
                e.printStackTrace();
            }

            System.out.println(atomicStampedReference.compareAndSet(5, 10,
                    stamp, stamp + 1));
            System.out.println("B2--->"+atomicStampedReference.getStamp());


        },"B").start();
    }
}

Integer包装类补充：