UserAccount.java

// UserAccount.java
import java.util.ArrayList;

public class UserAccount {
    private String username;
    private String pin;
    private double balance;
    private ArrayList<Transaction> transactions;

    public UserAccount(String username, String pin, double balance) {
        this.username = username;
        this.pin = pin;
        this.balance = balance;
        this.transactions = new ArrayList<>();
    }

    public boolean authenticate(String pin) {
        return this.pin.equals(pin);
    }

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

    public boolean withdraw(double amount) {
        if (amount > balance) return false;
        balance -= amount;
        transactions.add(new Transaction("Withdraw", amount));
        return true;
    }

    public void printTransactions() {
        System.out.println("Transaction History:");
        for (Transaction t : transactions) {
            System.out.println(" - " + t);
        }
    }

    public void changePIN(String newPIN) {
        this.pin = newPIN;
    }

    public String getUsername() { return username; }
    public double getBalance() { return balance; }
}