Are Thread.sleep(0) and Thread.yield() statements equivalent?

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No. The most obvious difference is that sleep() throws the (checked) InterruptedException. In practice, the effect may be almost the same, but it’s entirely implementation-dependant.

I’d wager that doing each a million times in a row would take much longer for sleep(), since system timer granularity probably often causes it to actually sleep for a non-negligible amount of time.

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