用java写一个带有图形界面的简易ATM自动提款机

好的，我可以为您提供一个简单的 Java ATM 提款机图形界面代码示例。这个示例包括账户验证、余额查询、取款以及退出功能。请注意，这只是一个简单的示例，并不包含所有的功能和安全措施。

import javax.swing.*;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

public class ATMGUI extends JFrame implements ActionListener {

    private JLabel usernameLabel;
    private JLabel passwordLabel;
    private JTextField usernameField;
    private JPasswordField passwordField;
    private JButton loginButton;
    private JButton balanceButton;
    private JButton withdrawButton;
    private JButton exitButton;
    private JLabel balanceLabel;
    private JTextField amountField;
    private JLabel messageLabel;

    private String userName = "John"; // 用户名
    private String password = "1234"; // 密码
    private double balance = 1000; // 账户余额

    public ATMGUI() {
        super("ATM 自动提款机");

        // 创建组件
        usernameLabel = new JLabel("用户名：");
        passwordLabel = new JLabel("密码：");
        usernameField = new JTextField(10);
        passwordField = new JPasswordField(10);
        loginButton = new JButton("登陆");
        balanceButton = new JButton("查询余额");
        withdrawButton = new JButton("取款");
        exitButton = new JButton("退出");
        balanceLabel = new JLabel("账户余额为：" + balance);
        amountField = new JTextField(10);
        messageLabel = new JLabel("");

        // 设置布局
        setLayout(new GridLayout(5, 2, 5, 5));

        // 添加组件
        add(usernameLabel);
        add(usernameField);
        add(passwordLabel);
        add(passwordField);
        add(loginButton);
        add(new JLabel(""));
        add(balanceButton);
        add(withdrawButton);
        add(amountField);
        add(exitButton);

        // 注册事件监听器
        loginButton.addActionListener(this);
        balanceButton.addActionListener(this);
        withdrawButton.addActionListener(this);
        exitButton.addActionListener(this);

        // 设置窗口属性
        setSize(400, 200);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        setLocationRelativeTo(null);
        setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == loginButton) {
            String inputUserName = usernameField.getText();
            String inputPassword = new String(passwordField.getPassword());
            if (userName.equals(inputUserName) && password.equals(inputPassword)) {
                messageLabel.setText("登陆成功！");
                add(messageLabel);
            } else {
                messageLabel.setText("用户名或密码错误，请重新输入！");
                add(messageLabel);
            }
        } else if (e.getSource() == balanceButton) {
            messageLabel.setText("账户余额为：" + balance);
            add(messageLabel);
        } else if (e.getSource() == withdrawButton) {
            double amount = Double.parseDouble(amountField.getText());
            if (amount > balance) {
                messageLabel.setText("余额不足！");
                add(messageLabel);
            } else {
                balance -= amount;
                messageLabel.setText("取款成功！账户余额为：" + balance);
                add(messageLabel);
            }
        } else if (e.getSource() == exitButton) {
            System.exit(0);
        }
    }

    public static void main(String[] args) {
        new ATMGUI();
    }
}

这是一个带有图形界面的简易 ATM 自动提款机的 Java 代码示例。希望能够帮到您！