问Java中的军用时差

EN

public class TimeInterval {

   private int fTime;
   private int sTime;

   public TimeInterval(int fTime, int sTime) {
      if(fTime < 0 || fTime > 2400 || sTime < 0 || sTime > 2400) {
          System.out.println("Illegal times, must be < 2400 and > 0)");
          System.exit(0);
      } else {
          this.fTime = fTime;
          this.sTime = sTime;
      }
   }

   public int getHours() {
      return Math.abs((fTime - sTime) / 100);
   }

   public int getMinutes() {
       return Math.abs((fTime - sTime) % 100);
   }

   public double getDecimalTime() {
      return getHours() + ((double) getMinutes() / 60);
   }
}

import java.util.*;

public class TestTimeInterval {

   public static void main(String[] args) {

      Scanner s = new Scanner(System.in);
      System.out.print("Please enter the first time: ");
      int fTime = s.nextInt();
      System.out.print("Please enter the second time: ");
      int sTime = s.nextInt();

      TimeInterval t = new TimeInterval(fTime, sTime);

      System.out.printf("%s: %2d hours %2d minutes \n", "Elapsed time in hrs/min ", t.getHours(), t.getMinutes());
      System.out.printf("%s: %.2f", "Elapsed time in decimal", t.getDecimalTime());

   }    
}