代码给出 点菜管理模块：该模块涉及到多个实体之间的关联操作，使用Java的GUI类实现点菜的界面，包含CRUD

以下是一个简单的Java餐饮管理系统的点菜管理模块代码示例：

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

public class OrderManagementGUI extends JFrame implements ActionListener {
    private JLabel nameLabel, priceLabel, quantityLabel, totalLabel;
    private JTextField nameField, priceField, quantityField, totalField;
    private JButton addButton, updateButton, deleteButton, clearButton;
    private JTable orderTable;
    private DefaultTableModel tableModel;
    private JScrollPane scrollPane;
    private Connection conn;
    private Statement stmt;
    private ResultSet rs;

    public OrderManagementGUI() {
        super("Order Management System");
        setSize(500, 500);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        // Initialize GUI components
        nameLabel = new JLabel("Dish Name:");
        priceLabel = new JLabel("Price:");
        quantityLabel = new JLabel("Quantity:");
        totalLabel = new JLabel("Total:");
        nameField = new JTextField(10);
        priceField = new JTextField(10);
        quantityField = new JTextField(10);
        totalField = new JTextField(10);
        addButton = new JButton("Add");
        updateButton = new JButton("Update");
        deleteButton = new JButton("Delete");
        clearButton = new JButton("Clear");
        tableModel = new DefaultTableModel();
        orderTable = new JTable(tableModel);
        scrollPane = new JScrollPane(orderTable);

        // Add GUI components to JFrame
        JPanel panel = new JPanel();
        panel.setLayout(new GridLayout(5, 2));
        panel.add(nameLabel);
        panel.add(nameField);
        panel.add(priceLabel);
        panel.add(priceField);
        panel.add(quantityLabel);
        panel.add(quantityField);
        panel.add(totalLabel);
        panel.add(totalField);
        panel.add(addButton);
        panel.add(updateButton);
        panel.add(deleteButton);
        panel.add(clearButton);
        add(panel, BorderLayout.NORTH);
        add(scrollPane, BorderLayout.CENTER);

        // Add action listeners to buttons
        addButton.addActionListener(this);
        updateButton.addActionListener(this);
        deleteButton.addActionListener(this);
        clearButton.addActionListener(this);

        // Connect to database
        try {
            Class.forName("com.mysql.jdbc.Driver");
            conn = DriverManager.getConnection("jdbc:mysql://localhost:3306/orderdb", "root", "password");
            stmt = conn.createStatement();
            rs = stmt.executeQuery("SELECT * FROM orders");
            populateTable(rs);
        } catch (Exception ex) {
            ex.printStackTrace();
        }

        setVisible(true);
    }

    private void populateTable(ResultSet rs) throws SQLException {
        // Clear table
        tableModel.setRowCount(0);

        // Populate table with data from ResultSet
        while (rs.next()) {
            String name = rs.getString("name");
            double price = rs.getDouble("price");
            int quantity = rs.getInt("quantity");
            double total = rs.getDouble("total");

            Object[] row = {name, price, quantity, total};
            tableModel.addRow(row);
        }
    }

    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == addButton) {
            try {
                String name = nameField.getText();
                double price = Double.parseDouble(priceField.getText());
                int quantity = Integer.parseInt(quantityField.getText());
                double total = price * quantity;

                // Add new order to database
                String query = "INSERT INTO orders (name, price, quantity, total) VALUES ('" + name + "', " + price + ", " + quantity + ", " + total + ")";
                stmt.executeUpdate(query);

                // Update table
                rs = stmt.executeQuery("SELECT * FROM orders");
                populateTable(rs);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        } else if (e.getSource() == updateButton) {
            try {
                int row = orderTable.getSelectedRow();
                String name = nameField.getText();
                double price = Double.parseDouble(priceField.getText());
                int quantity = Integer.parseInt(quantityField.getText());
                double total = price * quantity;

                // Update order in database
                String query = "UPDATE orders SET name='" + name + "', price=" + price + ", quantity=" + quantity + ", total=" + total + " WHERE name='" + orderTable.getValueAt(row, 0) + "'";
                stmt.executeUpdate(query);

                // Update table
                rs = stmt.executeQuery("SELECT * FROM orders");
                populateTable(rs);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        } else if (e.getSource() == deleteButton) {
            try {
                int row = orderTable.getSelectedRow();

                // Delete order from database
                String query = "DELETE FROM orders WHERE name='" + orderTable.getValueAt(row, 0) + "'";
                stmt.executeUpdate(query);

                // Update table
                rs = stmt.executeQuery("SELECT * FROM orders");
                populateTable(rs);
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        } else if (e.getSource() == clearButton) {
            // Clear input fields
            nameField.setText("");
            priceField.setText("");
            quantityField.setText("");
            totalField.setText("");
        }
    }

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

以上代码仅为示例，实际开发中需要根据实际需求进行修改和完善。