Java: What is the unit of the difference of two System.currentTimeMillis?

Question

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()?

Answer 1

Yes, it is in milliseconds. Bear in mind that the difference is not absolutely correct and may vary.