adam bien's blog

Beyond System.currentTimeMillis: Measuring Time with Duration and Instant 📎

With Duration and Instant classes, introduced in Java 8, you can calculate time spent in methods:


import java.time.Duration;
import java.time.Instant;

public class DurationTest {

    @Test
    public void durationInSecondsAndMillis() throws InterruptedException{
        var start = Instant.now();
        Thread.sleep(2042);
        var duration = Duration.between(start,Instant.now());
        System.out.printf("%d seconds and %d ms",duration.toSeconds(),duration.toMillisPart());
    }
}

The test above writes the following output: 2 seconds and 43 ms