public class Driver {

public static void main(String[] args) {
   Pet pet = readFile();
   Scanner scanner = new Scanner(System.in);
   if (pet == null) {
         System.out.println("Create your new pet");
         System.out.print("Enter its name: ");
         String name = scanner.nextLine();
         pet = new Pet(name);
   }
   System.out.printf("One day of the virtual world is %.2f seconds in the real world%n",
            (double)Pet.PERIOD / 1000.0);
   String[] task = pet.getGrommingTasks();
   System.out.println("Current status of your "
            + pet.getName());
   System.out.println(pet.toString());
   int index;
   do {
         System.out.println("What do you want to do to your "
               + pet.getName());
         for (int i = 0; i < task.length; i++) {
            System.out.printf("%d %s%n", i, task[i]);
         }
         System.out.printf("%d %s%n", task.length, "Nothing");
         System.out.print("Enter the index: ");
         try {
            index = Integer.parseInt(scanner.nextLine());
            if (index != task.length) {
               pet.gromming(index);
            }
         } catch (Exception e) {
            System.err.println("Invalid input");
         }

         System.out.println("Current status of your "
               + pet.getName());
         System.out.println(pet.toString());

         System.out.println("Do you want to continue? "
               + " yes : 1 ; no : other number ");
         try {
            index = Integer.parseInt(scanner.nextLine());
         } catch (Exception e) {
            index = 0;
         }
   } while (index == 1);
   saveFile(pet);
}

Write a program that has 3 public constants N = 100, Low = 20, Up =...