To stop any thread.. interrupts are send to it.
And threads handle this by throwing exception so that programmer can decide 
what to do 
depending upon the kind of exception it gets. (you may get different 
exceptions)

Since you are catching the exception, your thread is never stopped.. and 
hence future-cancel returns false.

If you throw again.. exception would unwind your while loop and stop the 
thread.
hence.. future-cancel is able to stop the thread and returns true.

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