Duration format test

DurationFormatTest.java

import java.time.*;
import java.time.temporal.*;

public class DurationFormatTest {
  public static void main(String... args) throws Exception {
    for (int i = 0; i < 10; i++) {
      long startTime = System.nanoTime();
      Thread.sleep(1000, 888888);
      long endTime = System.nanoTime();

      System.out.println(endTime - startTime);
      test1(endTime - startTime);

      Duration d = Duration.ofNanos(endTime - startTime);
      System.out.println(d.toString());
      test2(d);
    }
  }
  private static void test1(long n) {
    long s = (long) (n * 1e-9);
    long hours  = s / 3600;
    int minutes = (int) ((s % 3600) / 60);
    int seconds = (int) (s % 60);
    int millis  = (int) Math.round(n * 1e-6 - seconds * 1e3);
    System.out.format("%d:%d:%d %03d%n", hours, minutes, seconds, millis);
  }
  private static void test2(Duration d) {
    long s = d.getSeconds();
    int n  = d.getNano();
    long hours  = s / 3600;
    int minutes = (int) ((s % 3600) / 60);
    int seconds = (int) (s % 60);
    int millis  = (int) Math.round(n * 1e-6);
    System.out.format("%d:%d:%d %03d%n", hours, minutes, seconds, millis);
  }
}