Question

Which of the following is a best practice to measure time taken by a process for execution?

(a) System.currentTimeMillis()

(b) System.nanoTime()

(c) System.getCurrentTime()

(d) System.getProcessingTime()

I got this question in an internship interview.

This is a very interesting question from Coding best practices in portion Autoboxing & Miscellaneous of Java

Answer 1

Right answer is (b) System.nanoTime()

The best explanation: System.nanoTime takes around 1/100000 th of a second whereas System.currentTimeMillis takes around 1/1000th of a second.