Java Data Type - 如何将毫秒转换为可读字符串

import java.util.concurrent.TimeUnit;

public class Main{
  public static void main(String[] argv){
    System.out.println(millisToString(100000000));
  }
  public static String millisToString(long millis)
  {
      long hours = TimeUnit.MILLISECONDS.toHours(millis);
      long minutes = TimeUnit.MILLISECONDS.toMinutes(millis) - (hours * 60);
      long seconds = TimeUnit.MILLISECONDS.toSeconds(millis) - ((hours * 60 * 60) + (minutes * 60));
      millis = millis - ((hours * 60 * 60 * 1000) + (minutes * 60 * 1000) + (seconds * 1000));
      return String.format("%d hr(s) %d min(s) %d sec(s) %d ms", hours, minutes, seconds, millis);
  }
}