import java.util.Scanner;

public class BankingApp {
    static class Account {
        private String accountNumber;
        private double balance;

        // Constructor to initialize account number and balance
        public Account(String accountNumber, double balance) {
            this.accountNumber = accountNumber;
            this.balance = balance;
        }

        // Method to withdraw an amount from the account
        public void withdraw(double amount) throws IllegalArgumentException {
            if (amount < 0) {
                throw new IllegalArgumentException("Withdrawal amount cannot be negative.");
            }
            if (amount > balance) {
                throw new IllegalArgumentException("Insufficient funds.");
            }
            balance -= amount; // Deduct the amount from the balance
        }

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

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

        // Create an instance of Account
        Account account = new Account("123456789", 500.00); // Example account with initial balance

        System.out.print("Enter amount to withdraw: ");
        double amount = scanner.nextDouble();

        try {
            account.withdraw(amount); // Attempt to withdraw the specified amount
            System.out.println("Withdrawal successful! New balance: " + account.getBalance());
        } catch (IllegalArgumentException e) {
            System.out.println("Error: " + e.getMessage()); // Print error message for exceptions
        } finally {
            scanner.close(); // Close the scanner resource
        }
    }
}