"why is this class not thread safe?" Code Answer
Answers related to “why is this class not thread safe?”
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since the
incrementmethod isstaticit will synchronize on the class object for thethreadsafeclass. thedecrementmethod is not static and will synchronize on the instance used to call it. i.e., they will synchronize on different objects and thus two different threads can execute the methods at the same time. since the++and--operations are not atomic the class is not thread safe.also, since
countisstatic, modifying it fromdecrementwhich is a synchronized instance method is unsafe since it can be called on different instances and modifycountconcurrently that way.