TERM 2 ASSIGNMENT 4

/*
 * AP CS MOOC
 * Term 2 - Assignment 4: Time Comparable
 * You can use this solution to Assignment 1 in order to create a
comparable time object.
 * You will need to change the class so that it implements the
comparable interface.
 */

public class Time implements Comparable
{
     private int hour;
     private int minute;

    /*
     * Sets the default time to 12:00.
     */
    public Time ()
    {
         this(0, 0);
    }

    /*
     * Sets hour to h and minute to m.
     */
    public Time (int h, int m)
    {
         hour = 0;
         minute = 0;
         if (h >=1 && h <= 23)
              hour = h;
         if (m >= 1 && m <= 59)
              minute = m;

    }

    /*
     * Returns the time as a String of length 4 in the format: 0819.
     */
     public String toString ()
     {

          String h = "";
          String m = "";
          if ( hour <10)
               h +="0";
          if (minute <10)
               m +="0";
          h += hour;
          m+=minute;

          return "" + h + "" + m;
     }

     public int compareTo(Object d)
     {
      Time temp = (Time) d;
      int x = 0;
      if(hour == temp.hour && minute == temp.minute)
      {
        x = 0;
      }
      else if(hour < temp.hour || (hour == temp.hour && minute < temp.minute))
      {
        x = -1;
      }
      else if(hour > temp.hour || (hour == temp.hour && minute > temp.minute))
      {
        x = 1;
      }
      return x;
      }

     public String difference(Time t)
     {
       int min1 = (hour * 60) + minute;
       int min2 = (t.hour * 60) + t.minute;
       int diffmin= Math.abs(min1 - min2);

       int diffh = diffmin/60;
       diffmin = diffmin%60;


       String h = "";
       String m = "";
       if ( diffh <10)
         h +="0";
       if (diffmin <10)
         m +="0";
       h += diffh;
       m+=diffmin;

       return "Time difference: " + h + ":" + m;


     }
}