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It's not the case that every thread will have its own separate own copy. The variable is declared static, and so there is just one main copy of the variable, shared among all the instances. The issue here is that unless the variable is declared volatile, a thread may cache a local copy of the variable in a register and not synchronize that copy with the central copy in memory until the next time a synchronized statement occurs. It may also, however, not cache a local copy, or sync the local copy with the main copy any time before that, such as when the thread no longer needs to keep the variable in a register. So the thread will probably eventually see the new value of false, but unless you use a volatile variable or a synchronized block, it might not see it as soon as it's set, and there are no hard guarantees on when exactly it will see it.
- eugene.yarovoi March 18, 2013