Measure time elapsed in Java

Question

public class Stream
{
    public startTime;
    public endTime;
    public getDuration()
    {
        return startTime - endTime;
    }
}

It is also important that for example if the startTime it's 22:00 and endTime 1:00 . I want to get a duration of 3:00.

How can I accomplish this in Java?

Answer 1

This is also a way to work with timings:

public class Ets {
    public Ets() {
    reset();
    }
    public void reset() {
    t0=System.nanoTime();
    }
    public long t0() {
        return t0;
    }
    public long dt() {
        return System.nanoTime()-t0();
    }
    public double etms() {
    return etms(dt());
    }
    @Override public String toString() {
        return etms()+" ms.";
    }
    public static double etms(long dt) {
        return dt/1000000.; // 1_000_000. breaks cobertura
    }
    private Long t0;
}