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What is the unit of the difference of two System.currentTimeMillis ?
start = System.currentTimeMillis();
longoperation();
elapsedTime = System.currentTimeMillis() - start;
What is the unit of elapsed time here. It doesn’t look like milliseconds.
Is the above code segment the right way to find the time taken to execute longoperation()?
Yes, it is in milliseconds. Bear in mind that the difference is not absolutely correct and may vary.