使用AtomicStampedReference<T>的大坑

//在初始化的时候会把引用和时间戳存到pair中

AtomicStampedReference<Integer> integerAtomicStampedReference = new AtomicStampedReference<Integer>(2020,1);

 

然后执行

System.out.println(integerAtomicStampedReference.compareAndSet(2020,2021,integerAtomicStampedReference.getStamp(),integerAtomicStampedReference.getStamp()+1));

 

//此时的2020和Pair中的2021不是同一个对象了

//这里注意Integer是一个类 在-127——+128有缓存

//大于128没有缓存，所以

 

//compareAndSet中expectedReference和current的地址就不同了我草，结果执行下边就返回false了

public boolean compareAndSet(V   expectedReference,

                             V   newReference,

                             int expectedStamp,

                             int newStamp) {

    Pair<V> current = pair;

    return

        expectedReference == current.reference &&//这一行就是false

        expectedStamp == current.stamp &&

        ((newReference == current.reference &&

          newStamp == current.stamp) ||

         casPair(current, Pair.of(newReference, newStamp)));

}