ONLINE BANK

 ONLINE BANKING SYSTEM

class Account {

    private String username;

    private String password;

    private double balance;

    public Account(String username, String password) {

        this.username = username;

        this.password = password;

        this.balance = 0.0;

    }

    public boolean authenticate(String password) {

        return this.password.equals(password);

    }

    public String getUsername() {

        return username;

    }

    public double getBalance() {

        return balance;

    }

    public void deposit(double amount) {

        if (amount > 0)

            balance += amount;

    }

    public boolean withdraw(double amount) {

        if (amount > 0 && amount <= balance) {

            balance -= amount;

            return true;

        }

        return false;

    }

}

public class OnlineBankingSystem {

    private static HashMap<String, Account> accounts = new HashMap<>();

    private static Scanner scanner = new Scanner(System.in);

    public static void main(String[] args) {

        boolean running = true;

        System.out.println("Welcome to the Online Banking System");

        while (running) {

            System.out.println("\n1. Register");

            System.out.println("2. Login");

            System.out.println("3. Exit");

            System.out.print("Choose an option: ");

            String option = scanner.nextLine();

            switch (option) {

                case "1":

                    register();

                    break;

                case "2":

                    login();

                    break;

                case "3":

                    running = false;

                    break;

                default:

                    System.out.println("Invalid option.");

            }

        }

        System.out.println("Thank you for using the system!");

    }

    private static void register() {

        System.out.print("Enter username: ");

        String username = scanner.nextLine();

        if (accounts.containsKey(username)) {

            System.out.println("Username already exists!");

            return;

        }

OUTPUT

 Author 

   Selvi