Oppgave 4

    /**
     * Presents the menu for the user, and awaits input from the user. The menu
     * choice selected by the user is being returned.
     *
     * @return the menu choice by the user as a positive number starting from 1.
     *                 If 0 is returned, the user has entered a wrong value
     */
    private int showMenu()

    {
        int menuChoice = 0;

        System.out.println("\n***** Property Register Application v0.1 *****\n");
        System.out.println("1. Add property");
        System.out.println("2. List all properties");
        System.out.println("3. Search property");
        System.out.println("4. Calculate average area");
        //TODO: Add more menus
        System.out.println("9. Quit");
        System.out.println("\nPlease enter a number between 1 and 9.\n");
        Scanner sc = new Scanner(System.in);

        if (sc.hasNextInt()) {
            menuChoice = sc.nextInt();
        } else {
            System.out.println("You must enter a number, not text");
        }
        return menuChoice;
    }







    /**
     * Starts the application. This is the main loop of the application,
     * presenting the menu, retrieving the selected menu choice from the user,
     * and executing the selected functionality.
     */
    public void start() {
        boolean finished = false;

        // The while-loop will run as long as the user has not selected
        // to quit the application
        while (!finished) {
            int menuChoice = this.showMenu();
            switch (menuChoice)
            {
                case ADD_PROPERTY:
                    //TODO: Fill inn your code here....
                    break;

                case LIST_ALL_PROPERTIES:
                    //TODO: Fill inn your code here....
                    break;

                case FIND_PROPERTY:
                    //TODO: Fill inn your code here....
                    break;

                case CALCULATE_AVERAGE_AREA:
                    //TODO: Fill inn your code here....
                    break;

                case EXIT:
                    System.out.println("Thank you for using the Properties app!\n");
                    finished = true;
                    break;

                default:
                    System.out.println("Unrecognized menu selected..");
                    break;
            }
        }
    }



... der følgende konstanter er definert:



    // Constants representing the different menu choices
    private final int ADD_PROPERTY = 1;
    private final int LIST_ALL_PROPERTIES = 2;
    private final int FIND_PROPERTY = 3;
    private final int CALCULATE_AVERAGE_AREA = 4;
    private final int EXIT = 9;