Interrupting or stopping a sleeping thread
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Call the interrupt() method on your thread. This will cause the sleep to be cancelled and an InterruptedException will be thrown.
You can interrupt a sleeping thread with Thread.interrupt() . Now stopping a thread is deprecated - what if the thread is holding a lock to something? (There was a Thread.stop() , but it is HIGHLY discouraged).
Alternatively, instead of sleeping, you can have your thread wait for an object to be notified with a timeout, and simplify notify the object if you want the thread to wake up.
Suresh, I wish to pay attention to one issue. interrupt() methods itself does not interrupt thread. It just sends a request to a thread for interruption, by setting the flag to true. Usually your thread should process cancellation/interruption policy. It is greatly described in Java Concurrecy in Practice, section 7.1 Task Cancellation.
Blocking library methods such Thread.sleep and Object.wait try to detect when a thread has been interrupted and return early. They respond to interruption by clearing the interrupted status and throwing InterruptedException.
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