优化这段代码package com.daiinfo.catering.pane; import com.daiinfo.catering.util.JDBConnection; import javax.swing.*; import javax.swing.border.Border; import java.awt.*; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import java.util.EventListener; public class DishManagePane2 extends JFrame { private JTable table; private JButton addButton,updateButton,deleteButton; public DishManagePane2(){ setTitle("菜品管理"); setSize(800,600); String [] columnNames = {"菜品名","价格","菜品类别"}; Object[][] data = {{"糖醋排骨",29.0,"西餐"},{"宫保鸡丁",28.0,"中餐"}}; JTable table = new JTable(data,columnNames); addButton = new JButton("增加"); updateButton = new JButton("修改"); deleteButton = new JButton("删除"); addButton.addActionListener(new ActionListener() { @Override public void actionPerformed(ActionEvent e) { } }); JPanel panel = new JPanel(new BorderLayout()); panel.add(new JScrollPane(table),BorderLayout.CENTER); JPanel buttonPanel = new JPanel(new FlowLayout()); buttonPanel.add(addButton); buttonPanel.add(updateButton); buttonPanel.add(deleteButton); panel.add(buttonPanel,BorderLayout.SOUTH); add(panel); setVisible(true); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); } public static void main(String[] args) { new JDBConnection(); new DishManagePane2(); } }

以下是对代码的优化：

1. 将 JTable、JButton 声明为类成员变量，方便后面的方法访问。
2. 将 JTable 中的数据从构造函数中移除，改为从数据库中读取，使用 JDBConnection 类进行数据库连接和查询。
3. 将按钮的 ActionListener 单独提取出来，作为类内部的一个私有方法。
4. 将 JFrame 窗口的设置移到单独的方法中，方便对窗口属性的修改和扩展。

优化后的代码如下：

package com.daiinfo.catering.pane;

import com.daiinfo.catering.util.JDBConnection;

import javax.swing.*;
import javax.swing.border.Border;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.sql.Connection;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Vector;

public class DishManagePane2 extends JFrame {
    private JTable table;
    private JButton addButton, updateButton, deleteButton;

    public DishManagePane2() {
        setTitle("菜品管理");
        setSize(800, 600);
        setWindow();

        JPanel panel = new JPanel(new BorderLayout());
        panel.add(new JScrollPane(table), BorderLayout.CENTER);
        JPanel buttonPanel = new JPanel(new FlowLayout());
        buttonPanel.add(addButton);
        buttonPanel.add(updateButton);
        buttonPanel.add(deleteButton);
        panel.add(buttonPanel, BorderLayout.SOUTH);

        add(panel);
        setVisible(true);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    }

    private void setWindow() {
        addButton = new JButton("增加");
        updateButton = new JButton("修改");
        deleteButton = new JButton("删除");

        addButton.addActionListener(new ActionListener() {
            @Override
            public void actionPerformed(ActionEvent e) {
                // 添加菜品的逻辑
            }
        });

        // 从数据库中读取数据并绑定到 JTable 上
        try {
            Connection conn = JDBConnection.getConnection();
            Statement stmt = conn.createStatement();
            String sql = "select * from dishes";
            ResultSet rs = stmt.executeQuery(sql);

            Vector<Vector<Object>> data = new Vector<>();
            while (rs.next()) {
                Vector<Object> row = new Vector<>();
                row.add(rs.getString("name"));
                row.add(rs.getDouble("price"));
                row.add(rs.getString("category"));
                data.add(row);
            }

            Vector<String> columnNames = new Vector<>();
            columnNames.add("菜品名");
            columnNames.add("价格");
            columnNames.add("菜品类别");

            table = new JTable(data, columnNames);
        } catch (SQLException ex) {
            ex.printStackTrace();
        }
    }

    public static void main(String[] args) {
        new JDBConnection();
        new DishManagePane2();
    }
}

这样，代码就更加清晰、易于维护和扩展了。