ATM_Interface.java

import java.util.*;

class Transaction {
    String type;
    double amount;
    Date timestamp;

    public Transaction(String type, double amount) {
        this.type = type;
        this.amount = amount;
        this.timestamp = new Date();
    }
}

class Account {
    String userId;
    String userPin;
    double balance;
    List<Transaction> transactions;

    public Account(String userId, String userPin) {
        this.userId = userId;
        this.userPin = userPin;
        this.balance = 0.0;
        this.transactions = new ArrayList<>();
    }

    public void deposit(double amount) {
        balance += amount;
        transactions.add(new Transaction("Deposit", amount));
    }

    public void withdraw(double amount) {
        if (balance >= amount) {
            balance -= amount;
            transactions.add(new Transaction("Withdraw", amount));
        } else {
            System.out.println("Insufficient balance.");
        }
    }

    public void transfer(Account recipient, double amount) {
        if (balance >= amount) {
            balance -= amount;
            recipient.deposit(amount);
            transactions.add(new Transaction("Transfer", amount));
        } else {
            System.out.println("Insufficient balance.");
        }
    }

    public void showTransactionHistory() {
        System.out.println("Transaction History:");
        for (Transaction transaction : transactions) {
            System.out.println(transaction.type + " - $" + transaction.amount + " at " + transaction.timestamp);
        }
    }
}

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

        Account account = new Account("user123", "1234");

        System.out.print("Enter User ID: ");
        String userIdInput = sc.nextLine();

        System.out.print("Enter User PIN: ");
        String userPinInput = sc.nextLine();

        if (userIdInput.equals(account.userId) && userPinInput.equals(account.userPin)) {
            System.out.println("Login successful!");
            boolean continueRunning = true;

            while (continueRunning) {
                System.out.println("\nATM Menu:");
                System.out.println("1. Transactions History");
                System.out.println("2. Withdraw");
                System.out.println("3. Deposit");
                System.out.println("4. Transfer");
                System.out.println("5. Quit");
                System.out.print("Select an option: ");

                int choice = sc.nextInt();

                switch (choice) {
                    case 1:
                        account.showTransactionHistory();
                        break;
                    case 2:
                        System.out.print("Enter amount to withdraw: ");
                        double withdrawAmount = sc.nextDouble();
                        account.withdraw(withdrawAmount);
                        break;
                    case 3:
                        System.out.print("Enter amount to deposit: ");
                        double depositAmount = sc.nextDouble();
                        account.deposit(depositAmount);
                        break;
                    case 4:
                        System.out.print("Enter recipient's User ID: ");
                        String recipientId = sc.next();
                        System.out.print("Enter amount to transfer: ");
                        double transferAmount = sc.nextDouble();
                        // For simplicity, assuming recipient's account is the same as the current account
                        account.transfer(account, transferAmount);
                        break;
                    case 5:
                        continueRunning = false;
                        System.out.println("Exiting ATM. Thank you!");
                        break;
                    default:
                        System.out.println("Invalid choice! Please select a valid option.");
                }
            }
        } else {
            System.out.println("Login failed. Incorrect User ID or User PIN.");
        }
    }
}

// <------------------------------------For Sample UserId and Passowrd ------------------------------------------>
// UserId : user123 & Password : 1234

// <---------------------------------------------OUTPUT ---------------------------------------------------------->

// Enter User ID: user123
// Enter User PIN: 1234
// Login successful!

// ATM Menu:
// 1. Transactions History
// 2. Withdraw
// 3. Deposit
// 4. Transfer
// 5. Quit
// Select an option: 3
// Enter amount to deposit: 1500

// ATM Menu:
// 1. Transactions History
// 2. Withdraw
// 3. Deposit
// 4. Transfer
// 5. Quit
// Select an option: 1
// Transaction History:
// Deposit - $1500.0 at Sat Oct 07 20:37:39 IST 2023

// ATM Menu:
// 1. Transactions History
// 2. Withdraw
// 3. Deposit
// 4. Transfer
// 5. Quit
// Select an option: 2
// Enter amount to withdraw: 500

// ATM Menu:
// 1. Transactions History
// 2. Withdraw
// 3. Deposit
// 4. Transfer
// 5. Quit
// Select an option: 1
// Transaction History:
// Deposit - $1500.0 at Sat Oct 07 20:37:39 IST 2023
// Withdraw - $500.0 at Sat Oct 07 20:37:52 IST 2023

// ATM Menu:
// 1. Transactions History
// 2. Withdraw
// 3. Deposit
// 4. Transfer
// 5. Quit
// Select an option: 3
// Enter amount to deposit: 5000

// ATM Menu:
// 1. Transactions History
// 2. Withdraw
// 3. Deposit
// 4. Transfer
// 5. Quit
// Select an option: 4
// Enter recipient's User ID: user234
// Enter amount to transfer: 4500

// ATM Menu:
// 1. Transactions History
// 2. Withdraw
// 3. Deposit
// 4. Transfer
// 5. Quit
// Select an option: 1
// Transaction History:
// Deposit - $1500.0 at Sat Oct 07 20:37:39 IST 2023
// Withdraw - $500.0 at Sat Oct 07 20:37:52 IST 2023
// Deposit - $5000.0 at Sat Oct 07 20:38:07 IST 2023
// Deposit - $4500.0 at Sat Oct 07 20:38:21 IST 2023
// Transfer - $4500.0 at Sat Oct 07 20:38:21 IST 2023

// ATM Menu:
// 1. Transactions History
// 2. Withdraw
// 3. Deposit
// 4. Transfer
// 5. Quit
// Select an option: 5
// Exiting ATM. Thank you!