How to calculate the running time of my program? [duplicate]

Answer 1

The general approach to this is to:

1. Get the time at the start of your benchmark, say at the start of main().
2. Run your code.
3. Get the time at the end of your benchmark, say at the end of main().
4. Subtract the start time from the end time and convert into appropriate units.

A hint: look at System.nanoTime() or System.currentTimeMillis().