Refresh Your Java - Before Java Interview
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There is a difference between join() and sleep(). join() will wait until the timeout expires or the thread finishes. sleep() will just wait for the specified amount of time unless interrupted. So it is perfectly possible for join() to return much faster than the specified time.
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This Portal has More than 500 Java Interview Questions (also could be Considered as Quick Notes) very neatly separated topic by topic with simple diagrams which makes you easily understandable. Importantly these are from our Realtime expericance.