Bad Coding Smells concerns: Divergent Change

[gsus25]

THIS ISSUE IS POSTED AS A COLLEGE ASSIGNMENT I recommend applying the "Introduce Null Object" refactoring technique. In the HotelRentalSystem code, the NullOption class is used as a placeholder to represent the default case when an invalid menu option is chosen. By introducing a null object instead of creating a new instance of NullOption, you can simplify the code and eliminate the need for a separate class. This approach makes the code cleaner and reduces the complexity associated with handling null cases. Refactored Code:

import java.util.Scanner;

class Hotel {
    void guestProfile() {
        System.out.println("Executing guestProfile");
    }

    void guestDestination() {
        System.out.println("Executing guestDestination");
    }

    void guestPurchase() {
        System.out.println("Executing guestPurchase");
    }

    void guestProfileView() {
        System.out.println("Executing guestProfileView");
    }

    void guestExit() {
        System.out.println("Executing guestExit");
    }
}

public class HotelRentalSystem {
    private static final Scanner scan = new Scanner(System.in);

    public static void main(String[] args) {
        HotelRentalSystem system = new HotelRentalSystem();
        system.domesticHotelRental();
    }

    void domesticHotelRental() {
        int choice, n = 1;

        System.out.println("\t\t\t\t\t\t======================================================");
        System.out.println("\t\t\t\t\t\t|         ** HOTEL RENTAL AND ROOM BOOKING SYSTEM   **");
        System.out.println("\t\t\t\t\t\t******************************************************");
        System.out.println("\t\t\t\t\t\t|               1. Profile Creation                  |");
        System.out.println("\t\t\t\t\t\t|               2. Destination                       |");
        System.out.println("\t\t\t\t\t\t|               3. Booking & Payment                 |");
        System.out.println("\t\t\t\t\t\t|               4. View Profile                      |");
        System.out.println("\t\t\t\t\t\t|               5. Exit                              |");
        System.out.println("\t\t\t\t\t\t******************************************************");

        System.out.println("Enter Your Choice: ");
        choice = scan.nextInt();

        Hotel hotel = new Hotel();
        n += executeMenuOption(choice, n, hotel);
        System.out.println("n: " + n); // Solo para verificar el resultado
    }

    private int executeMenuOption(int choice, int n, Hotel hotel) {
        switch (choice) {
            case 1:
                hotel.guestProfile();
                return 1;

            case 2:
                hotel.guestDestination();
                return 1;

            case 3:
                hotel.guestPurchase();
                return 1;

            case 4:
                hotel.guestProfileView();
                return 1;

            case 5:
                hotel.guestExit();
                return 0;

            default:
                return 0;
        }
    }
}