Task3.java

// Task 3: ATM Interface 

import java.util.Scanner;
                                             
class BankAccount {
    private double balance;  

    public BankAccount(double initialBalance) {
        this.balance = initialBalance;
    }

    public double getBalance() {
        return balance;
    }

    public void deposit(double amount) {
        if (amount > 0) {
            balance += amount;
            System.out.println("Deposit successful. New balance: $" + balance);
        } else {
            System.out.println("Invalid deposit amount.");
        }
    }

    public boolean withdraw(double amount) {
        if (amount > 0) {
            if (amount <= balance) {
                balance -= amount;
                System.out.println("Withdrawal successful. New balance: $" + balance);
                return true;
            } else {
                System.out.println("Insufficient funds for withdrawal. Current balance: $" + balance);
            }
        } else {
            System.out.println("Invalid withdrawal amount. Please enter a positive amount.");
        }
        return false;
    }
}

class ATM {
    private BankAccount bankAccount;

    public ATM(BankAccount bankAccount) {
        this.bankAccount = bankAccount;
    }

    public void displayMenu() {
        System.out.println("ATM Menu:");
        System.out.println("1. Check Balance");
        System.out.println("2. Deposit");
        System.out.println("3. Withdraw");
        System.out.println("4. Exit");
    }

    public void run() {
        Scanner scanner = new Scanner(System.in);

        while (true) {
            displayMenu();
            System.out.print("Enter your choice: ");
            int choice = scanner.nextInt();

            switch (choice) {
                case 1:
                    System.out.println("Current balance: $" + bankAccount.getBalance());
                    break;
                case 2:
                    System.out.print("Enter the deposit amount: $");
                    double depositAmount = scanner.nextDouble();
                    bankAccount.deposit(depositAmount);
                    break;
                case 3:
                    System.out.print("Enter the withdrawal amount: $");
                    double withdrawalAmount = scanner.nextDouble();
                    boolean withdrawSuccess = bankAccount.withdraw(withdrawalAmount);
                    if (withdrawSuccess) {
                        System.out.println("Withdrawal successful.");
                    }
                    break;
                case 4:
                    System.out.println("Thank you for using the ATM. Goodbye!");
                    return;
                default:
                    System.out.println("Invalid choice. Please try again.");

                scanner.close();
            }
        }
    }
}

public class Task3 {
    public static void main(String[] args) {
        BankAccount userAccount = new BankAccount(1000.0); // Initial balance is $1000
        ATM atm = new ATM(userAccount);
        atm.run();
    }
}