Using an atomic makes more sense. This class predates my reading of your book ;-) Although, looking at this again, I'm embarrassed to admit I'm not sure *why* synchronizing on incr doesn't do anything. Because I'm reassigning it?
> Slight problem with newUniqueID(), though. Synchronizing on incr doesn't do > anything. How about using AtomicLong and masking out the high bits?
