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A piece of code is thread-safe if it only manipulates data structures in a way that allows consistent execution of this code by multiple threads.

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Is this method thread safe?

You may still have a logic problem. The first time getNewId() is called noOfUserIdsInReserveCurrently = 0 so fetchIdsInReserve() is called and noOfUserIdsInReserveCurrently = 199. Now imagine the th …
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