How to convert nanoseconds to seconds using the TimeUnit enum?

Question

How to convert a value from nanoseconds to seconds?

Here\'s the code segment:

import java.io.*;
import java.util.concurrent.*; 
..

class Stamper          


        

Answer 1

To reduce verbosity, you can use a static import:

import static java.util.concurrent.TimeUnit.NANOSECONDS;

-and henceforth just type

NANOSECONDS.toSeconds(elapsedTime);

Answer 2

Well, you could just divide by 1,000,000,000:

long elapsedTime = end - start;
double seconds = (double)elapsedTime / 1_000_000_000.0;

If you use TimeUnit to convert, you'll get your result as a long, so you'll lose decimal precision but maintain whole number precision.