//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
1 public boolean compareAndSet(V expectedReference,
2
3 V newReference,
4
5 int expectedStamp,
6
7 int newStamp) {
8
9 Pair<V> current = pair;
10
11 return
12
13 expectedReference == current.reference &&//这一行就是false
14
15 expectedStamp == current.stamp &&
16
17 ((newReference == current.reference &&
18
19 newStamp == current.stamp) ||
20
21 casPair(current, Pair.of(newReference, newStamp)));
22
23 }
