Question

Implement a class TimeOfDay that stores a time between 00:00:00 and 23:59:59. Supply a

constructor TimeOfDay(int hours, int minutes, int seconds) and accessor methods to get the current

hours, minutes, and seconds. Supply methods

TimeOfDay addSeconds(int seconds)

int secondsFrom(TimeOfDay other)

The first method returns a TimeOfDay object that is the given number of seconds away from the

current object. The second method computes the number of seconds between two TimeOfDay

objects. Use three integers for the hours, minutes, and seconds as the internal representation.

java language

Answer 1

Program:

//TimeOfDay class
public class TimeOfDay
{
   //private data members
   private int hours;
   private int minutes;
   private int seconds;
  
   //constructor
   TimeOfDay(int hours, int minutes, int seconds)
   {
       if(hours<0 || hours>=24)
           this.hours = 0;
       else
           this.hours = hours;
          
       if(minutes<0 || minutes>=60)
           this.minutes = 0;
       else
           this.minutes = minutes;
          
       if(seconds<0 || seconds>=60)
           this.seconds = 0;
       else
           this.seconds = seconds;
   }
  
   //method to return hours
   int getHours()
   {
       return this.hours;
   }
  
   //method to return minutes
   int getMinutes()
   {
       return this.minutes;
   }
  
   //method to return seconds
   int getSeconds()
   {
       return this.seconds;
   }
  
   /* method returns a TimeOfDay object that is the given number of seconds
   away from the current object */
   TimeOfDay addSeconds(int seconds)
   {
       int h = seconds / 3600;
      
       seconds = seconds % 3600;
      
       int m = seconds / 60;
      
       int s = seconds % 60;
          
       TimeOfDay td = new TimeOfDay(h, m, s);
      
       if(td.seconds + this.seconds >=60) td.minutes++;
      
       td.seconds = (td.seconds + this.seconds) % 60;
      
       if(td.minutes + this.minutes >=60) td.hours++;
      
       td.minutes = (td.minutes + this.minutes) % 60;
      
       td.hours = (td.hours + this.hours) % 24;
  
       return td;
      
   }
  
   //method computes the number of seconds between two TimeOfDay
   int secondsFrom(TimeOfDay other)
   {
       int tsecs;
       int carry = 0, carry2 = 0;
      
       if(this.seconds > other.seconds){
carry = 1;
tsecs = 60 - this.seconds;
}
else
   tsecs = other.seconds - this.seconds;
  
if(this.minutes > other.minutes + carry){
carry2 = 1;
tsecs = tsecs + (60 - this.minutes) * 60;
}
else
   tsecs = + tsecs + (other.minutes - this.minutes) * 60;
  
tsecs = tsecs + (other.hours - this.hours - carry2) * 3600;
  
return tsecs;
   }

}

//driver class
class Driver
{
   public static void main (String[] args)
   {
       TimeOfDay t1 = new TimeOfDay(12, 34, 55);
       TimeOfDay t2 = new TimeOfDay(8, 12, 15);
      
       int nsecs = t2.secondsFrom(t1);
      
       System.out.println("Time difference in seconds: " + nsecs);
      
       TimeOfDay t3 = t2.addSeconds(nsecs);
      
       System.out.println("After adding " + nsecs + " seconds new time is " +
           t3.getHours() + ":" + t3.getMinutes() + ":" + t3.getSeconds());
          
   }
}

Output:

Time difference in seconds: 15760
After adding 15760 seconds new time is 12:34:55