import java.util.Scanner;

/**
*
* @author
*/
public class Question3 {

private static Scanner keyboard = new Scanner(System.in);

public static void main(String[] args) {
   /**
      * Declare and create arrays empNos, nonHospitalisation and
      * hospitalisation. For testing purposes, let the capacity of the arrays
      * empNos, nonHospitalisation and hospitalisation be 3.
      */
   int capacity = 3;
   String[] empNos = new String[capacity];
   int[] nonHospitalisation = new int[capacity];
   int[] hospitalisation = new int[capacity];

   /**
      * Declare and initialise count to zero as there is no valid staff data
      * recorded in the arrays yet,
      */
   int count = 0;

   /**
      * Repeatedly display a menu to allow the user to select an option and
      * call the appropriate method to perform the task according to the
      * selected option until the user chooses to exit the program.
      */
   int choice;
   do {
         displayMenu();
         choice = keyboard.nextInt();
         switch (choice) {
            case 1:
               count = addStaff(count, empNos, nonHospitalisation,
                        hospitalisation);
               break;
            case 2:
               count = removeStaff(count, empNos, nonHospitalisation,
                        hospitalisation);
               break;
            case 3:
               takeSickLeave(count, empNos, nonHospitalisation,
                        hospitalisation);
               break;
            case 4:
               listSickLeave(count, empNos, nonHospitalisation,
                        hospitalisation);
               break;
         }
         System.out.println("");
   } while (choice != 0);

}

private static void listSickLeave(int count,
         String[] empNos, int[] nonHospitalisation,
         int[] hospitalisation) {
   System.out.printf("%-6s%26s%22s\n", "Emp No",
            "Non Hospitalisation", "Hospitalisation");
   for (int i = 0; i < count; i++) {
         System.out.printf("%-6s%16d%24d", empNos[i],
               nonHospitalisation[i], hospitalisation[i]);
         if (60 - hospitalisation[i] >= 14) {
            System.out.print("***");
         }
         System.out.println("");
   }
   System.out.println("End of List");
}

/**
* A method takeSickLeave to allow a staff to take leave.
*
* The method accepts the arrays for the staff details and an integer count
* which is the number of staff data recorded in the arrays.
*
* @param count
* @param empNos
* @param nonHospitalisation
* @param hospitalisation
*/
private static void takeSickLeave(int count,
         String[] empNos, int[] nonHospitalisation,
         int[] hospitalisation) {
   /**
      * If the method finds that there is no staff data stored in the array,
      * the method prints the error message: No data for take leave!
      */
   if (count <= 0) {
         System.out.println("No data for take leave!");
   } else {
         /**
         * Otherwise, the method prompts for the employee number of the
         * staff taking leave, and then checks whether provided employee
         * number exists. If employee number does not exist, the method
         * prints the error message: Xxx: Not existing employee number where
         * Xxx is the provided employee number.
         */
         System.out.print("Enter employee number to remove: ");
         String number = keyboard.next();
         int index = search(number, empNos, count);
         if (index == -1) {
            System.out.println(number + ": Not existing employee number");
         } else {

The Knight’s Tour is a classic problem in mathematics. From any pos...