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Possible Duplicate:
When does Java's Thread.sleep throw InterruptedException?
I saw we have to catch InterruptedException in the Thread.Sleep method, why? I never saw this exception occured in the real time. Any clue?
This happens if thread#1 is sleeping, and another thread interrupts it. This is usually an attempt to stop thread#1. For example, thread#1 is sleeping while doing some long-running task (perhaps in background) and the user hits a cancel button.