Question

In my do while loop, the body works fine initially, but when it loops, it prints the first two statements like it should but it does not allow me to enter the name instead it goes straight to enter pin and whatever I enter it skips the rest and asks me if I want another transaction.

I have an array object partially filed. The variables in the object are name, pin, account number and balance. When I add a new object and set the balance, the new balance I enter causes the balance for the previous objects to change as well. I think it has something to do with the balance variable being declared as static but I don’t make it static, i can the error “Cannot make a static reference to the non-static method withdraw(double) from the type CustomerRecord”. (SOLVED) Thank you.

public class BankCustomers 
{
public static void main(String[] args)

    //------------------------------------------------
    //Part4: Find a customer record from anotherArray 
    //to do transaction(s) and update the record's balance

    char repeat; // User control to repeat or quit
    Scanner keyboard = new Scanner(System.in); //creating the scanner

    String aName;
    int aPin;
    double aWithdraw;
    double aDeposit;

    do{   


        //Read customer information before search
        System.out.println();
        System.out.println("Lets make a transaction");
        System.out.println("Enter customer full name");
        aName = keyboard.nextLine( );

        System.out.println("Enter Pin");
        aPin = keyboard.nextInt();


        //Search an Array for equal aName and aPin
        for (int i = 0; i < index; i++)
        {
            CustomerRecord cRecord = anotherArray[i];
                if((cRecord.getName().equalsIgnoreCase(aName)) && (cRecord.getPin()           ==(aPin)))
                {
                    System.out.println(cRecord);

                    System.out.println("Enter Withdraw Amount");
                    aWithdraw = keyboard.nextDouble();
                    CustomerRecord.withdraw(aWithdraw);

                    System.out.println("Enter Deposite Amount");
                    aDeposit = keyboard.nextDouble();
                    CustomerRecord.deposit(aDeposit);  
                    System.out.println(cRecord);             
                }                               
        }


        System.out.println("\nAnother Transaction? (y for yes)");
        repeat = keyboard.next().charAt(0);

    }while(repeat == 'y' || repeat == 'Y');

        //Print the records on screen
    for (int i = 0; i < index; i++)
        System.out.print(anotherArray[i]);

    }                           

Answer 1

Your problem is twofold:

First, balance istatic, which means it is associated with the class, not any of its instances (objects), or in other terms it is shared between all instances of that class.

Second, as you pointed it out, your static method withdraw is accessing balance. The consideration about static applies here just as well — the method is associated with the class, and cannot access memebers that are non-static.

To solve the second problem, remove static from the withdraw declaration (and remove static from balance as well. Thyis will make your code CustomerRecord.withdraw() not compile, becuase withdraw is now not associated with the class itself, but an instance of it. So you need to use an instance and call withdraw on that

cRecord.withdraw(aWithdraw);

Similarly for deposit