Banking_Application.java

import java.util.HashMap;
import java.util.Map;
import java.util.Scanner;

class BankAccount {
    private String accountNumber;
    private String accountHolderName;
    private double balance;

    public BankAccount(String accountNumber, String accountHolderName) {
        this.accountNumber = accountNumber;
        this.accountHolderName = accountHolderName;
        this.balance = 0.0;
    }

    public void deposit(double amount) {
        balance += amount;
        System.out.println("Deposit successful. Current balance: " + balance);
    }

    public void withdraw(double amount) {
        if (balance >= amount) {
            balance -= amount;
            System.out.println("Withdrawal successful. Current balance: " + balance);
        } else {
            System.out.println("Insufficient balance.");
        }
    }

    public double getBalance() {
        return balance;
    }

    public String getAccountNumber() {
        return accountNumber;
    }

    public String getAccountHolderName() {
        return accountHolderName;
    }
}

public class Banking_Application {
    private static Map<String, BankAccount> accounts = new HashMap<>();

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        boolean exit = false;

        while (!exit) {
            System.out.println("Banking Application");
            System.out.println("1. Create Account");
            System.out.println("2. Deposit");
            System.out.println("3. Withdraw");
            System.out.println("4. Check Balance");
            System.out.println("5. Exit");
            System.out.print("Enter your choice: ");
            int choice = scanner.nextInt();
            scanner.nextLine(); // Consume the newline character

            switch (choice) {
                case 1:
                    createAccount(scanner);
                    break;
                case 2:
                    deposit(scanner);
                    break;
                case 3:
                    withdraw(scanner);
                    break;
                case 4:
                    checkBalance(scanner);
                    break;
                case 5:
                    exit = true;
                    break;
                default:
                    System.out.println("Invalid choice. Please try again.");
                    break;
            }

            System.out.println();
        }
        scanner.close();
    }

    private static void createAccount(Scanner scanner) {
        System.out.print("Enter account number: ");
        String accountNumber = scanner.nextLine();
        System.out.print("Enter account holder name: ");
        String accountHolderName = scanner.nextLine();
        BankAccount account = new BankAccount(accountNumber, accountHolderName);
        accounts.put(accountNumber, account);
        System.out.println("Account created successfully.");
    }

    private static void deposit(Scanner scanner) {
        System.out.print("Enter account number: ");
        String accountNumber = scanner.nextLine();
        BankAccount account = accounts.get(accountNumber);
        if (account != null) {
            System.out.print("Enter deposit amount: ");
            double amount = scanner.nextDouble();
            account.deposit(amount);
        } else {
            System.out.println("Account not found.");
        }
    }

    private static void withdraw(Scanner scanner) {
        System.out.print("Enter account number: ");
        String accountNumber = scanner.nextLine();
        BankAccount account = accounts.get(accountNumber);
        if (account != null) {
            System.out.print("Enter withdrawal amount: ");
            double amount = scanner.nextDouble();
            account.withdraw(amount);
        } else {
            System.out.println("Account not found.");
        }
    }

    private static void checkBalance(Scanner scanner) {
        System.out.print("Enter account number: ");
        String accountNumber = scanner.nextLine();
        BankAccount account = accounts.get(accountNumber);
        if (account != null) {
            System.out.println("Account Holder Name: " + account.getAccountHolderName());
            System.out.println("Account Balance: " + account.getBalance());
        } else {
            System.out.println("Account not found.");
        }
    }
}