Banking app OOP Java

import java.util.Scanner;

// Define a class representing a bank account
class BankAccount {
    // Define instance variables
    private String accountNumber; // Stores the account number
    private String holderName;    // Stores the name of the account holder
    private double balance;       // Stores the account balance

    // Constructor to initialize the account with account number and holder name
    public BankAccount(String accountNumber, String holderName) {
        this.accountNumber = accountNumber; // Initialize account number
        this.holderName = holderName;       // Initialize holder name
        this.balance = 0.0;                 // Initialize balance to 0
    }

    // Method to deposit funds into the account
    public void deposit(double amount) {
        balance += amount; // Add the deposited amount to the balance
        System.out.println(amount + " deposited successfully."); // Print a success message
    }

    // Method to withdraw funds from the account
    public void withdraw(double amount) {
        if (balance >= amount) { // Check if the balance is sufficient for withdrawal
            balance -= amount; // Subtract the withdrawal amount from the balance
            System.out.println(amount + " withdrawn successfully."); // Print a success message
        } else {
            System.out.println("Insufficient funds."); // Print an error message if balance is insufficient
        }
    }

    // Method to get the current balance of the account
    public double getBalance() {
        return balance; // Return the current balance
    }

    // Method to get the account number
    public String getAccountNumber() {
        return accountNumber; // Return the account number
    }

    // Method to get the holder name
    public String getHolderName() {
        return holderName; // Return the holder name
    }
}

// Main class for the banking application
public class BankingApplication {
    // Main method, entry point of the program
    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in); // Create a Scanner object for user input
        System.out.println("Welcome to Our Bank!"); // Display a welcome message
        System.out.print("Enter your account number: "); // Prompt user to enter account number
        String accountNumber = scanner.nextLine(); // Read the account number entered by the user
        System.out.print("Enter your name: "); // Prompt user to enter their name
        String holderName = scanner.nextLine(); // Read the name entered by the user

        BankAccount account = new BankAccount(accountNumber, holderName); // Create a BankAccount object

        // Display a menu for banking operations
        while (true) {
            System.out.println("\n1. Deposit");
            System.out.println("2. Withdraw");
            System.out.println("3. Check Balance");
            System.out.println("4. Exit");
            System.out.print("Enter your choice: ");
            int choice = scanner.nextInt(); // Read user's choice

            switch (choice) {
                case 1: // If user chooses deposit
                    System.out.print("Enter deposit amount: ");
                    double depositAmount = scanner.nextDouble(); // Read deposit amount
                    account.deposit(depositAmount); // Call deposit method
                    break;
                case 2: // If user chooses withdraw
                    System.out.print("Enter withdrawal amount: ");
                    double withdrawAmount = scanner.nextDouble(); // Read withdrawal amount
                    account.withdraw(withdrawAmount); // Call withdraw method
                    break;
                case 3: // If user chooses check balance
                    System.out.println("Account Holder: " + account.getHolderName());
                    System.out.println("Account Number: " + account.getAccountNumber());
                    System.out.println("Balance: " + account.getBalance());
                    break;
                case 4: // If user chooses exit
                    System.out.println("Thank you for using our bank!");
                    System.exit(0); // Exit the program
                default: // If user enters an invalid choice
                    System.out.println("Invalid choice. Please try again.");
            }
        }
    }
}