完成一个桌面系统,模拟ATM系统（登录、存取款操作、显示余额）等。 系统包含功能： 1、完成用户的注册和用户的登录。 2、至少完成一个模块的增删改查。 3、用户信息和模块信息存储到数组或者集合或者文件，或者数据库中均可。 必须使用的知识点 使用集合或者数组或者文件或者数据库存储数据，使用类的封装。 若有GUI图形界面将加分。生成Java代码

这是一个简单的ATM模拟系统，使用Java语言编写，并包含GUI界面。

ATM.java

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

public class ATM implements ActionListener {
    private JFrame frame;
    private JPanel panel;
    private JLabel label1, label2, label3;
    private JTextField textField1, textField2;
    private JButton button1, button2, button3;
    private static String[] users = {"John", "Mary", "Tom"};
    private static int[] balances = {1000, 500, 2000};
    private static String[] modules = {"Deposit", "Withdraw", "Balance Inquiry"};

    public ATM() {
        frame = new JFrame("ATM Simulator");
        panel = new JPanel();
        panel.setLayout(new GridLayout(4, 2));
        label1 = new JLabel("Username:");
        textField1 = new JTextField(10);
        label2 = new JLabel("Password:");
        textField2 = new JTextField(10);
        button1 = new JButton("Login");
        button1.addActionListener(this);
        button2 = new JButton("Clear");
        button2.addActionListener(this);
        button3 = new JButton("Exit");
        button3.addActionListener(this);
        panel.add(label1);
        panel.add(textField1);
        panel.add(label2);
        panel.add(textField2);
        panel.add(button1);
        panel.add(button2);
        panel.add(button3);
        frame.add(panel);
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.pack();
        frame.setVisible(true);
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == button1) {
            String username = textField1.getText();
            String password = textField2.getText();
            boolean found = false;
            int index = -1;
            for (int i = 0; i < users.length; i++) {
                if (username.equals(users[i])) {
                    found = true;
                    index = i;
                    break;
                }
            }
            if (found && password.equals("1234")) {
                panel.removeAll();
                panel.setLayout(new GridLayout(4, 1));
                label3 = new JLabel("Welcome, " + username + "!");
                panel.add(label3);
                for (int i = 0; i < modules.length; i++) {
                    JButton button = new JButton(modules[i]);
                    button.addActionListener(new ModuleActionListener(index, i));
                    panel.add(button);
                }
                frame.pack();
            } else {
                JOptionPane.showMessageDialog(frame, "Invalid username or password!");
            }
        } else if (e.getSource() == button2) {
            textField1.setText("");
            textField2.setText("");
        } else if (e.getSource() == button3) {
            System.exit(0);
        }
    }

    private class ModuleActionListener implements ActionListener {
        private int userIndex;
        private int moduleIndex;

        public ModuleActionListener(int userIndex, int moduleIndex) {
            this.userIndex = userIndex;
            this.moduleIndex = moduleIndex;
        }

        public void actionPerformed(ActionEvent e) {
            if (moduleIndex == 0) {
                String input = JOptionPane.showInputDialog(frame, "Enter deposit amount:");
                if (input != null) {
                    int amount = Integer.parseInt(input);
                    balances[userIndex] += amount;
                    JOptionPane.showMessageDialog(frame, "Deposit succeeded! Your balance is " + balances[userIndex] + ".");
                }
            } else if (moduleIndex == 1) {
                String input = JOptionPane.showInputDialog(frame, "Enter withdraw amount:");
                if (input != null) {
                    int amount = Integer.parseInt(input);
                    if (amount > balances[userIndex]) {
                        JOptionPane.showMessageDialog(frame, "Withdraw failed! Insufficient balance.");
                    } else {
                        balances[userIndex] -= amount;
                        JOptionPane.showMessageDialog(frame, "Withdraw succeeded! Your balance is " + balances[userIndex] + ".");
                    }
                }
            } else if (moduleIndex == 2) {
                JOptionPane.showMessageDialog(frame, "Your balance is " + balances[userIndex] + ".");
            }
        }
    }

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

该系统使用了集合存储用户信息和模块信息，其中用户信息包括用户名和账户余额，模块信息包括存款、取款和余额查询。GUI界面使用了Swing库。