[FIXED] Adding a submenu to menu

Issue

I am having trouble getting my submenu to show up when I select input 3)Select Students in my main menu. Any help fixing this is greatly appreciated, Thank you!

here is the main menu (shows up first when I run the code)

 public void menu() throws ClassNotFoundException, IOException {
    Scanner sc = new Scanner(System.in);
    int input;
    do {
        System.out.println("1) Populate Students");
        System.out.println("2) Load Students from file");
        System.out.println("3) Select Students");
        System.out.println("4) Show Students");
        System.out.println("5) Save Students to file");
        System.out.println("6) Exit");
        input = Integer.parseInt(sc.next());
        if (input == 1) 
        {
            populateStudents();
        } else if (input == 2) {
            loadStudents();
        } else if (input == 3) {
            selectStudents();
        } else if (input == 4) {
            showStudents();
        } else if (input == 5) {
            saveStudents();
        }
    } while (input != 6);

}

This is my sub menu code, I want to be able to select input 3 from the main menu and call this sub menu to then select from.

    public void studentSubMenu(int i) throws IOException, ClassNotFoundException
    { 
        System.out.println("Student Menu, select an option");
   int input = 0;
 
   while(input != 5)
   {
            System.out.println("1) Calculate Average");
            System.out.println("2) Calculate Weighted Average");
            System.out.println("3) Determine Letter Grade");
            System.out.println("4) Display Students info");
            System.out.println("5) GO BACK");
          Scanner sc = new Scanner(System.in);
          input=sc.nextInt();
        
            if (input == 1) 
            {
               myStudents[i].calcAvg();
            } 
            if (input == 2) 
            {
                 myStudents[i].calcAvg(.7, .3);
            } 
            if (input == 3) 
            {
                myStudents[i].calcLetterGrade();
            } 
            if (input == 4) 
            {
                 myStudents[i].displayStudent();
            } else if (input == 5) {
                menu();
            }
             
         }                

    

Solution

Expanding on my comment:

The issue here is that the case you have written for handling the input of 3 in the menu method calls a function called selectStudents.

This is not the method containing your sub menu logic. That method you have named studentSubMenu. This means that if the desired behavior of a user entering 3 is them being shown the sub menu, this won't occur unless studentSubMenu is either called directly in the else if (input == 3) block, or by selectStudents itself.

Your logic in menu could look something like:

} else if (input == 3) {
    int student = selectStudents();
    studentSubMenu(student);
}

Answered By - Reece M
Answer Checked By - Willingham (JavaFixing Volunteer)