Question

I have a small program I am working on. I Just put a try catch in my code and everything seems to be working except for 1 thing. I will post my code below… As you can see my try catch statement in my code it tells the program to go down to the checkNumber method for exception handling. I keep getting an error on this part…

if (input == 5){
}

The input keeps underlining red and saying “Incompatible operand types scanner and int.

Not sure what the problem is… or how to fix it.. here is my code

import java.util.ArrayList;
import java.util.Scanner;

    public class BankMain
    {
    private double availableBal =80;
    private double totalBal =100;
    private double availableBal2 =480;
    private double totalBal2 =500;
    private double availableBal3 =80;
    private double totalBal3 =100;
    ArrayList<Integer> cardNum = new ArrayList<Integer>();
    static Scanner input = new Scanner(System.in);

    private String error;           //String the error from the exception
    {
        error = "error";
    }


    public void cardNumbers(){


            Scanner cards = new Scanner(System.in);
            Scanner input = new Scanner(System.in);
            Scanner keyboard = new Scanner(System.in);



            try{


            System.out.println("Please select a 5 digit card number");

            cardNum.add(input.nextInt());
            checkNumber();


            }

            catch(invalidNumber err){

                System.out.println("Caught Error: " + err.getError());
            }

            System.out.println("Thank you! You're card number is " +cardNum);

            System.out.println("Type 'c' to go back to main menu.");
            String value = keyboard.next();

            if(value.equalsIgnoreCase("c")){
                menu();

    }

    else if (!keyboard.equals('c')){

        System.out.println("Invalid Entry!");

    }

}


    public void menu(){

    System.out.println("ATM Menu:");
    System.out.println();
    System.out.println("1 = Create Account");
    System.out.println("2 = Account Login");
    System.out.println("3 = Exit ATM");
    query();
                }

        public void startAtm()
        {
            menu();

        }



        public void drawMainMenu()
        {

            AccountMain main3 = new AccountMain();
            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();

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

        public void viewAccountInfo()
        {
            System.out.println("Account Information:");
            System.out.println("\t--Total balance: $"+totalBal);
            System.out.println("\t--Available balance: $"+availableBal);
            drawMainMenu();
        }

        public void viewAccountInfo2()
        {
            System.out.println("Account Information:");
            System.out.println("\t--Total balance: $"+totalBal2);
            System.out.println("\t--Available balance: $"+availableBal2);
            drawMainMenu();
        }

        public void deposit(int depAmount)
        {
            System.out.println("\n***Please insert your money now...***");
            totalBal =totalBal +depAmount;
            availableBal =availableBal +depAmount;
        }

        public void checkNsf(int withdrawAmount)
        {
            if(totalBal -withdrawAmount < 0)
                System.out.println("\n***ERROR!!! Insufficient funds in you accout***");
            else
            {
                totalBal =totalBal -withdrawAmount;
                availableBal =availableBal -withdrawAmount;
                System.out.println("\n***Please take your money now...***");
                }
        }

        public void addFunds()
        {
            int addSelection;

            System.out.println("Deposit funds:");
            System.out.println("1 - $20");
            System.out.println("2 - $40");
            System.out.println("3 - $60");
            System.out.println("4 - $100");
            System.out.println("5 - Back to main menu");
            System.out.print("Choice: ");
            addSelection =input.nextInt();

            switch(addSelection)
            {
            case 1:
                deposit(20);
                drawMainMenu();
                break;
            case 2:
                deposit(40);
                drawMainMenu();
                break;
            case 3:
                deposit(60);
                drawMainMenu();
                break;
            case 4:
                deposit(100);
                drawMainMenu();
                break;
            case 5:
                drawMainMenu();
                break;
            }
        }

        public void withdraw()
        {
            int withdrawSelection;

            System.out.println("Withdraw money:");
            System.out.println("1 - $20");
            System.out.println("2 - $40");
            System.out.println("3 - $60");
            System.out.println("4 - $100");
            System.out.println("5 - Back to main menu");
            System.out.print("Choice: ");
            withdrawSelection =input.nextInt();

            switch(withdrawSelection)
            {
            case 1:
                checkNsf(20);
                drawMainMenu();
                break;
            case 2:
                checkNsf(40);
                drawMainMenu();
                break;
            case 3:
                checkNsf(60);
                drawMainMenu();
                break;
            case 4:
                checkNsf(100);
                drawMainMenu();
                break;
            case 5:
                drawMainMenu();
                break;
            }
        }

public void query(){

    Scanner keyboard = new Scanner(System.in);
    double input = keyboard.nextInt();  


    if (input == 2){

        BankMainPart2 main2 = new BankMainPart2();

        System.out.println("Please enter your 5 digit card number.");
         BankMainPart2.loginCard(cardNum);



    }
    else if (input == 1){

        cardNumbers();

    }

    else if (input == 3){
        System.out.println("Thank you, have a nice day!");
        System.exit(0);


    }

}

public void checkingMenu()
{

    AccountMain main3 = new AccountMain();
    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();

    switch(selection)
    {
    case 1:
        viewAccountInfo2();
        break;
    case 2:
        withdraw();
        break;
    case 3:
        addFunds();
        break;
    case 4:
        AccountMain.selectAccount();
        break;
    case 5:
        System.out.println("Thank you for using this ATM!!! goodbye");
    }
}

private static void checkNumber() throws invalidNumber              //run the check activation exception
{
  if (input == 5)
  {
      System.out.println("");
  }
  else
     throw new invalidNumber("invalid number");
 }  

    public static void main(String args[])
    {
        BankMain myAtm = new BankMain();
        myAtm.startAtm();
    }
}

Class Bank Main 2

import java.util.ArrayList;
import java.util.Scanner;


public class BankMainPart2 {

    public static void loginCard(ArrayList<Integer> cardNum){

        BankMain main = new BankMain();
        AccountMain main3 = new AccountMain();

        Scanner logNum = new Scanner(System.in);    

        int loginInput = logNum.nextInt();

        if (cardNum.contains(loginInput)) {

            main3.selectAccount();

        }

        else {

            System.out.println("Sorry, that pin number is incorrect!");
        }
    }
}

Answer 1

Your variable input is an object of Scanner which is declared globally and will be used for the method checknumber() and 5 is an int. Hence they are incompatible types.

The same statement works for method query() because for query you have locally defined a variable input which is of the type double.

What you should actually write is

if(input.nextInt() == 5){}