BankSystemTester.java

import java.util.Scanner;

public class BankSystemTester {
    public static void main(String[] args) {
        BankSystem bankSystem = new BankSystem();
        Scanner scanner = new Scanner(System.in);

        System.out.println("Welcome to the Online Banking System!");
        System.out.println("1. Register");
        System.out.println("2. Login");
        System.out.println("3. Exit");

        while (true) {
            System.out.print("Choose an option: ");
            int choice = scanner.nextInt();
            scanner.nextLine(); // Consume the newline character

            switch (choice) {
                case 1: // Register a new customer
                    System.out.print("Enter your name: ");
                    String name = scanner.nextLine();
                    System.out.print("Create a username: ");
                    String userID = scanner.nextLine();
                    System.out.print("Create a password: ");
                    String password = scanner.nextLine();
                    bankSystem.registerCustomer(name, userID, password);
                    break;

                case 2: // Login
                    System.out.print("Enter your username: ");
                    String loginUserID = scanner.nextLine();
                    System.out.print("Enter your password: ");
                    String loginPassword = scanner.nextLine();

                    Customer customer = bankSystem.authenticateCustomer(loginUserID, loginPassword);
                    if (customer != null) {
                        bankSystem.showMenu(customer);
                    } else {
                        System.out.println("Invalid credentials! Please try again.");
                    }
                    break;

                case 3: // Exit
                    System.out.println("Thank you for using the Online Banking System. Goodbye!");
                    scanner.close();
                    System.exit(0);
                    break;

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