// Simple class to represent a period of time in hours, minutes, and seconds.
// Demonstrates the Comparable interface.

public class TimePeriod implements Comparable<TimePeriod> {
   private int hours;
   private int minutes;
   private int seconds;
   
   public TimePeriod(int seconds) {
      this.hours = seconds / 3600;
      this.minutes = (seconds - this.hours * 3600) / 60;
      this.seconds = seconds % 60;
   }
   
   public TimePeriod(int minutes, int seconds) {
      this(minutes * 60 + seconds);
   }
   
   public TimePeriod(int hours, int minutes, int seconds) {
      this(hours * 3600 + minutes * 60 + seconds);
   }
   
   public String toString() {
      return String.format("%02d:%02d:%02d", this.hours, this.minutes, this.seconds);
   }
   
   // a.compareTo(b)
   //    if a is "less than" b, return a negative number
   //    if a is "greater than" b, return a positive number
   //    if a is "equal to" b, return 0
   public int compareTo(TimePeriod other) {
      if (this.hours != other.hours) {
         return this.hours - other.hours;
      } else if (this.minutes != other.minutes) {
         return this.minutes - other.minutes;
      } else {
         return this.seconds - other.seconds;
      }
   }
}