ATMStimulator.java

import java.util.InputMismatchException;
import java.util.Scanner;

public class ATMStimulator {
    private double balance;

    // Initialize balance
    public ATMStimulator(double initialBalance) {
        if (initialBalance < 0) {
            throw new IllegalArgumentException("Initial balance cannot be negative.");
        }
        this.balance = initialBalance;
    }

    // Get current balance
    public double getBalance() {
        return balance;
    }

    // Deposit money
    public void deposit(double amount) {
        if (amount <= 0) {
            throw new IllegalArgumentException("Deposit amount must be positive.");
        }
        balance += amount;
        System.out.println("Deposited ₹" + amount);
        System.out.println("Balance: ₹" + balance);
    }

    // Withdraw money
    public void withdraw(double amount) {
        if (amount <= 0) {
            throw new IllegalArgumentException("Withdrawal amount must be positive.");
        }
        if (amount > balance) {
            throw new ArithmeticException("Insufficient funds!");
        }
        balance -= amount;
        System.out.println("Withdrawn ₹" + amount);
        System.out.println("Balance: ₹" + balance);
    }

    public static void main(String[] args) {
        Scanner scanner = new Scanner(System.in);
        ATMStimulator atm = new ATMStimulator(1000);

        System.out.println("Welcome to ATM Simulator");

        while (true) {
            System.out.println("\n1. Check Balance");
            System.out.println("2. Deposit");
            System.out.println("3. Withdraw");
            System.out.println("4. Exit");
            System.out.print("Enter your choice: ");

            try {
                int choice = scanner.nextInt();

                switch (choice) {
                    case 1:
                        System.out.printf("Current Balance: ₹%.2f%n", atm.getBalance());
                        break;
                    case 2:
                        System.out.print("Enter amount to deposit: ₹");
                        double depositAmount = scanner.nextDouble();
                        atm.deposit(depositAmount);
                        break;
                    case 3:
                        System.out.print("Enter amount to withdraw: ₹");
                        double withdrawAmount = scanner.nextDouble();
                        atm.withdraw(withdrawAmount);
                        break;
                    case 4:
                        System.out.println("Thank you for using the ATM!");
                        scanner.close();
                        System.exit(0);
                        break;
                    default:
                        System.out.println("Invalid choice. Try again.");
                }
            } catch (InputMismatchException e) {
                System.out.println("Please enter numbers only.");
                scanner.next();
            } catch (IllegalArgumentException | ArithmeticException e) {
                System.out.println("Error: " + e.getMessage());
            } finally {
                System.out.println("Transaction completed.\n");
            }
        }
    }
}