import java.util.*;
public class ActivityManager
{
public static void main(String[] args)
{
   // declare totalTime and activityTime of type Itime
   // **** replace this line with correct code ****
   int minutes; double seconds; // user input values
   Scanner input = new Scanner (System.in); // to read user input

   Itime totalTime, activityTime ;

   totalTime = new Itime(0, 0.0);

   // display purpose
   System.out.println ("This program tracks total time in minutes");
   System.out.println ("and seconds for a series of activities.");
   System.out.println (); // print blank line
   System.out.println ("Author: \tVersion: March 27, 2018");
   System.out.println (); // print blank line

   // specify format for input
   System.out.println ("Enter activity time in minutes and"
         + " seconds, all in a");
   System.out.println ("single line with spaces in between. Entering"
         + " values" );
   System.out.println ("outside appropriate ranges will terminate"
         + " the program.");
   System.out.println (); // print blank line

   // create the totalTime object of type Itime with 0 minutes and 0.0 seconds
   // **** replace this line with correct code ****
   System.out.println ("Total time so far is: "
         + totalTime.toString());
   System.out.println (); // print blank line

   // prompt and read time for an activity
   System.out.print ("Enter time for an activity: ");
   minutes = input.nextInt();
   seconds = input.nextDouble();

   // Accumulate if appropriate
   while (minutes >= 0 && seconds >= 0 && seconds < 60) {
         // create the activityTime object of type Itime with given minutes and seconds
         activityTime = new Itime(minutes, seconds);
         // **** replace this line with correct code ****
         // add totalTime and activityTime and put the result in totalTime
         // **** replace this line with correct code ****
         totalTime = totalTime.addItime(activityTime);

Design, write, and test a Java program to do the following. Call yo...