Question

This is a small part of my program that I am working on. I’m trying to check if the user enters the correct number.

They have five choices to choose from so they can either hit 1, 2, 3, 4, or 5. Then press enter.

So I want to check to make sure the user doesn’t type anything in < 1 or > 5. I got that part to work… But I just want to know if there is a easier way to do it then from what I did in code below.

The next part is that I also want to make sure the user doesn’t type in letters. like “gfgfadggdagdsg” for a choice.

Here is my code of the part I am working on….

public void businessAccount()
    {


        int selection;

        System.out.println("\nATM main menu:");
        System.out.println("1 - View account balance");
        System.out.println("2 - Withdraw funds");
        System.out.println("3 - Add funds");
        System.out.println("4 - Back to Account Menu");
        System.out.println("5 - Terminate transaction");
        System.out.print("Choice: ");
        selection = input.nextInt();

            if (selection > 5){

            System.out.println("Invalid choice.");
            businessAccount();

        }
            else if (selection < 1){
                System.out.println("Invalid choice.");
                businessAccount();
            }
            else {

        switch(selection)
        {
        case 1:
            viewAccountInfo3();
            break;
        case 2:
            withdraw3();
            break;
        case 3:
            addFunds3();
            break;
        case 4:
            AccountMain.selectAccount();
            break;
        case 5:
            System.out.println("Thank you for using this ATM!!! goodbye");
        }
            }
    }

Answer 1

You may get rid of checking < 1 and > 5 by adding a default case.

try{
     selection = input.nextInt();        
     switch(selection){
      case 1:
          viewAccountInfo3();
          break;
      case 2:
          withdraw3();
          break;
      case 3:
          addFunds3();
          break;
      case 4:
          AccountMain.selectAccount();
          break;
      case 5:
          System.out.println("Thank you for using this ATM!!! goodbye");
          break;
      default:             
          System.out.println("Invalid choice.");
          businessAccount();

      }
}catch(InputMismatchException e){
    //do whatever you wanted to do in case input is not an int
}