AtomicInteger.compareAndSet that returns the original value, not a boolean

Question

Java's AtomicInteger offers public final boolean compareAndSet(int expect, int update). If false is returned, I would like to know what the value actually was at the time when the comparison failed. Is this possible in Java?

In .Net, there's public static int CompareExchange(ref int location1, int value, int comparand), which always returns the original value.

Answer 1

public int getAndCompareAndSet(AtomicInteger ai, int expected, int update) {
  while (true) {
    int old = ai.get();
    if (old != expected) {
      return old;
    } else if (ai.compareAndSet(old, update)) {
      return old;
    }
  }
}

(This sort of loop is how most operations on AtomicInteger are implemented: loops of get, do some logic, try compare-and-set.)