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Initial commit - GUI ATM project
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‎.gitignore‎

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*.class

‎ATMgui.jar‎

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‎ATMgui.java‎

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import javax.swing.*;
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import java.awt.*;
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import java.awt.event.*;
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import java.text.DecimalFormat;
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import java.util.*;
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public class ATMgui {
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private float balance = 0;
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private int pin = 1019;
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private int pinAttempts = 0;
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private HashMap<String, Float> accounts = new HashMap<>();
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private ArrayList<String> miniStatement = new ArrayList<>();
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private JFrame frame;
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// Decimal format for displaying money properly
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private DecimalFormat df = new DecimalFormat("#,##0.00");
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public ATMgui() {
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try {
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UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
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} catch (Exception ignored) {}
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accounts.put("12345", 10000f);
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accounts.put("67890", 20000f);
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showLoginScreen();
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}
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public void showLoginScreen() {
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frame = new JFrame("ATM - Login");
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frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.setLayout(new GridBagLayout());
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frame.setLocationRelativeTo(null);
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GridBagConstraints gbc = new GridBagConstraints();
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gbc.insets = new Insets(10, 10, 10, 10);
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JLabel label = new JLabel("Enter PIN:");
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label.setFont(new Font("Arial", Font.PLAIN, 20));
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JPasswordField pinField = new JPasswordField(10);
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pinField.setFont(new Font("Arial", Font.PLAIN, 20));
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JButton loginBtn = new JButton("Login");
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loginBtn.setFont(new Font("Arial", Font.BOLD, 18));
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loginBtn.addActionListener(e -> {
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String entered = new String(pinField.getPassword());
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if (entered.equals(String.valueOf(pin))) {
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pinAttempts = 0;
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frame.dispose();
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showMenu();
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} else {
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pinAttempts++;
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if (pinAttempts >= 3) {
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JOptionPane.showMessageDialog(frame, "Too many attempts. Exiting.");
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System.exit(0);
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} else {
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JOptionPane.showMessageDialog(frame, "Incorrect PIN. Attempts left: " + (3 - pinAttempts));
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}
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}
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});
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gbc.gridx = 0; gbc.gridy = 0;
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frame.add(label, gbc);
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gbc.gridx = 1;
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frame.add(pinField, gbc);
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gbc.gridx = 1; gbc.gridy = 1;
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frame.add(loginBtn, gbc);
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frame.setVisible(true);
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}
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public void showMenu() {
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frame = new JFrame("ATM - Menu");
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frame.setExtendedState(JFrame.MAXIMIZED_BOTH);
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frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
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frame.setLayout(new GridLayout(7, 1, 20, 20));
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frame.setLocationRelativeTo(null);
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Font btnFont = new Font("Arial", Font.BOLD, 18);
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JButton balanceBtn = new JButton("Check Balance");
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JButton depositBtn = new JButton("Deposit");
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JButton withdrawBtn = new JButton("Withdraw");
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JButton transferBtn = new JButton("Transfer Funds");
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JButton miniStmtBtn = new JButton("Mini Statement");
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JButton changePinBtn = new JButton("Change PIN");
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JButton exitBtn = new JButton("Exit");
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for (JButton btn : new JButton[]{balanceBtn, depositBtn, withdrawBtn, transferBtn, miniStmtBtn, changePinBtn, exitBtn}) {
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btn.setFont(btnFont);
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frame.add(btn);
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}
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balanceBtn.addActionListener(e -> JOptionPane.showMessageDialog(frame, "Balance: ₹" + df.format(balance)));
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depositBtn.addActionListener(e -> deposit());
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withdrawBtn.addActionListener(e -> withdraw());
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transferBtn.addActionListener(e -> transferFunds());
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miniStmtBtn.addActionListener(e -> showMiniStatement());
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changePinBtn.addActionListener(e -> changePin());
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exitBtn.addActionListener(e -> {
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JOptionPane.showMessageDialog(frame, "Thank you for using the ATM!");
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System.exit(0);
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});
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frame.setVisible(true);
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}
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public void deposit() {
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String input = JOptionPane.showInputDialog(frame, "Enter amount to deposit:");
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try {
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float amount = Float.parseFloat(input);
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balance += amount;
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miniStatement.add("Deposited: ₹" + df.format(amount));
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JOptionPane.showMessageDialog(frame, "Deposit Successful!");
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} catch (Exception e) {
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JOptionPane.showMessageDialog(frame, "Invalid amount!");
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}
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}
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public void withdraw() {
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String input = JOptionPane.showInputDialog(frame, "Enter amount to withdraw:");
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try {
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float amount = Float.parseFloat(input);
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if (amount > balance) {
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JOptionPane.showMessageDialog(frame, "Insufficient Balance!");
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} else {
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balance -= amount;
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miniStatement.add("Withdrawn: ₹" + df.format(amount));
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JOptionPane.showMessageDialog(frame, "Withdrawal Successful!");
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}
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} catch (Exception e) {
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JOptionPane.showMessageDialog(frame, "Invalid amount!");
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}
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}
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public void transferFunds() {
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String acc = JOptionPane.showInputDialog(frame, "Enter recipient account number:");
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if (!accounts.containsKey(acc)) {
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JOptionPane.showMessageDialog(frame, "Invalid account number!");
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return;
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}
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String input = JOptionPane.showInputDialog(frame, "Enter amount to transfer:");
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try {
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float amt = Float.parseFloat(input);
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if (amt > balance) {
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JOptionPane.showMessageDialog(frame, "Insufficient Balance!");
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return;
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}
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balance -= amt;
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accounts.put(acc, accounts.get(acc) + amt);
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miniStatement.add("Transferred ₹" + df.format(amt) + " to Acc: " + acc);
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JOptionPane.showMessageDialog(frame, "Transfer Successful!");
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} catch (Exception e) {
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JOptionPane.showMessageDialog(frame, "Invalid amount!");
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}
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}
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public void showMiniStatement() {
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if (miniStatement.isEmpty()) {
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JOptionPane.showMessageDialog(frame, "No transactions yet.");
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return;
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}
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StringBuilder sb = new StringBuilder();
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for (String t : miniStatement) {
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sb.append(t).append("\n");
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}
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sb.append("\nCurrent Balance: ₹").append(df.format(balance));
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JTextArea textArea = new JTextArea(sb.toString());
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textArea.setEditable(false);
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textArea.setFont(new Font("Monospaced", Font.PLAIN, 14));
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JOptionPane.showMessageDialog(frame, new JScrollPane(textArea), "Mini Statement", JOptionPane.INFORMATION_MESSAGE);
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}
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public void changePin() {
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String oldPin = JOptionPane.showInputDialog(frame, "Enter current PIN:");
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if (!oldPin.equals(String.valueOf(pin))) {
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JOptionPane.showMessageDialog(frame, "Incorrect current PIN!");
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return;
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}
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String newPin = JOptionPane.showInputDialog(frame, "Enter new PIN:");
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String reNew = JOptionPane.showInputDialog(frame, "Re-enter new PIN:");
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if (newPin.equals(reNew)) {
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pin = Integer.parseInt(newPin);
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JOptionPane.showMessageDialog(frame, "PIN changed successfully!");
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} else {
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JOptionPane.showMessageDialog(frame, "PINs do not match!");
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}
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}
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public static void main(String[] args) {
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SwingUtilities.invokeLater(ATMgui::new);
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}
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}

‎LICENSE‎

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MIT License
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Copyright (c) 2025 Nilesh Palve
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in
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all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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THE SOFTWARE.

‎README.md‎

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# 💳 ATM Machine Simulation (Java GUI Project)
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![Java](https://img.shields.io/badge/Java-19-blue.svg)
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![Platform](https://img.shields.io/badge/Platform-GUI--App-lightgrey)
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![Status](https://img.shields.io/badge/Status-Completed-brightgreen)
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![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)
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This is a **Graphical User Interface (GUI)** based ATM simulation system built using **Java Swing**. The application simulates basic banking operations such as deposit, withdrawal, balance check, fund transfer, PIN change, and mini statement functionality with full-screen UI.
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---
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## 🚀 Features
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- ✅ PIN-based login with limited attempts
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- 💵 Deposit money
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- 💸 Withdraw money with validation
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- 📋 View mini statement
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- 🔁 Transfer funds to other simulated accounts
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- 🔐 Change PIN securely
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- 📐 Full-screen GUI layout using Swing
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- 🪟 Centered components with formatted currency output
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---
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## 🧰 Technologies Used
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- Java (JDK 19)
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- Java Swing (GUI)
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- `ArrayList`, `HashMap` (Collections Framework)
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- `JOptionPane`, `JFrame`, `JPanel`, `JButton`, etc.
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- `DecimalFormat` for currency formatting
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---
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## 📂 Project Structure
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```
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ATM-Machine-GUI/
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├── ATMgui.java # Main GUI Java file
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├── README.md # Project documentation
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└── LICENSE # (Optional) MIT License
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```
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---
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## ▶️ How to Run
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### 🔧 Prerequisites
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- Java JDK 19 installed and configured in your system PATH
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- Java-compatible editor (e.g., VS Code, IntelliJ, NetBeans)
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### 💻 Compile the code:
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```bash
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javac ATMgui.java
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```
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### 🚀 Run the application:
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```bash
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java ATMgui
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```
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---
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## 🖼 GUI Preview
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> The application launches in full screen
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> All ATM options are accessible via buttons
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> Popups are used for input and feedback
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> Balances appear formatted (e.g., ₹10,000.00)
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---
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## 📦 Future Enhancements
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- [ ] Export mini statement to file
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- [ ] Store account and transaction data persistently
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- [ ] Add user login system with account registration
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- [ ] Package as `.jar` for easy sharing and launch
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---
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## 📜 License
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This project is licensed under the **MIT License**.
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See the [`LICENSE`](LICENSE) file for details.
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---
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## 🙋‍♂️ Author
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**Nilesh Palve**
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📧 [palvenileshp@gmail.com](mailto:palvenileshp@gmail.com)
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---

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