Not really. But my position is that if a question mentions multiple threads and does not give any other assurances, we should assume that multiple threads may have access to the same shared instances. Questions about threading are usually
testing to see if you can think of all the worst-case scenarios that haven't been explicitly guaranteed against.
In this particular case, assuming that nextCount was supposed to be nextCount(), it doesn't seem to matter much. Any time any
thread calls getYourNumber(), using any instance, myCount gets updated correctly, and the instance used gets the that same value as its yourNumber. Dunno what they actually ask after this, but the code looks reasonably thread-safe.