Main.java

import java.util.Scanner;

public class Main {

    public static void main(String[] args) {

        BankService service = new BankService();
        Scanner scanner = new Scanner(System.in);

        while (true) {

            System.out.println("\n==== JAVA BANKING SYSTEM ====");
            System.out.println("1. Create Customer");
            System.out.println("2. Login");
            System.out.println("3. Exit");
            System.out.print("Choose option: ");

            int choice = scanner.nextInt();
            scanner.nextLine();

            switch (choice) {

                case 1:
                    service.createCustomer(scanner);
                    break;

                case 2:
                    service.login(scanner);
                    break;

                case 3:
                    System.exit(0);

                default:
                    System.out.println("Invalid option.");
            }
        }
    }
}