JButton deleteButton = new JButton("Delete Club"); deleteButton.addActionListener(new ActionListener() { public void actionPerformed(ActionEvent e) { int selectedRow = clubTable.getSelectedRow(); if (selectedRow != -1) { int clubId = (int) clubTable.getValueAt(selectedRow, 0); deleteClub(clubId); refreshClubTable(); clearMemberTable(); } } });

这段代码创建了一个JButton实例对象deleteButton，用于显示"Delete Club"文本的按钮。接着，为该按钮添加了一个ActionListener监听器，用于监听按钮Action事件。当用户点击按钮时，会触Action事件，执行ActionListener中定义的actionPerformed()方法。

在这个例子中，actionPerformed()方法首先获取clubTable表格中当前选中的行数selectedRow。如果该值不为-1，说明用户已经选中了一行俱乐部信息。接着，代码从clubTable表格中获取选中行的第一列数据，即俱乐部的ID号clubId。然后调用deleteClub(clubId)方法，用于删除该俱乐部。接下来，调用refreshClubTable()方法，用于刷新俱乐部表格的数据。最后，调用clearMemberTable()方法，用于清空会员表格的数据。

这段代码的主要作用是实现删除俱乐部的功能，并在数据发生变化后刷新相关的表格数据。deleteClub()、refreshClubTable()和clearMemberTable()方法可能是自定义的方法，具体实现可能因应用而异。

相关问题

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。

帮我改写的能运行起来package com.swingtest; import java.awt.Container; import java.awt.event.ActionEvent; import java.awt.event.ActionListener; import javax.swing.*; import javax.swing.table.DefaultTableModel; public class StudentManger extends JFrame implements ActionListener { JLabel lstname = new JLabel("学生姓名: "); JTextField tf_name = new JTextField(12); JLabel lmajor = new JLabel("专业"); JTextField tf_major = new JTextField(); JButton btnOK = new JButton("添加"); JButton btnDelete = new JButton("删除"); JButton btnQuit = new JButton("退出"); JTable table; DefaultTableModel model; public void studentManger(String name) { // TODO Auto-generated constructor stub JLabel welcome = new JLabel(name +",欢迎登录！"); setTitle("学生管理"); setSize(400,400); welcome.setBounds(50,20,200,20); lstname.setBounds(50,20,200,20); tf_name.setBounds(150,50,100,20); lmajor.setBounds(50,80,100,20); tf_major.setBounds(150,80,100,20); btnOK.setBounds(80,110,60,20); btnDelete.setBounds(150,110,60,20); btnQuit.setBounds(220,110,60,20); Container c = getContentPane(); JPanel panel = new JPanel(); panel.setLayout(null); panel.add(welcome); panel.add(lstname); panel.add(tf_name); panel.add(lmajor); panel.add(tf_major); panel.add(btnOK); panel.add(btnDelete); panel.add(btnQuit); String[] colName = {"姓名","专业"}; model = new DefaultTableModel(colName,0); table = new JTable(model); JScrollPane scrollPane = new JScrollPane(table); c.setLayout(new SpringLayout()); c.add(panel); c.add(scrollPane); setLocationRelativeTo(null); setVisible(true); btnOK.addActionListener(this); btnDelete.addActionListener(this); btnQuit.addActionListener(this); } @Override public void actionPerformed(ActionEvent e) { // TODO Auto-generated method stub Object ob = e.getSource(); if(ob == btnQuit) { System.exit(0); }else if(ob ==btnOK) { String[] stuInfo = {tf_name.getText(),tf_major.getText()}; model.addRow(stuInfo); tf_name.setText(""); tf_major.setText(""); }else if(ob == btnDelete) { if(table.getSelectedRow()<0) { JOptionPane.showMessageDialog(null,"请在表格中选中要删除的行");} else { model.removeRow(table.getSelectedRow()); } }} public static void main(String[] args) { new StudentManger(); } }

改写后的代码如下：

package com.swingtest;

import java.awt.Container;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;

import javax.swing.*;
import javax.swing.table.DefaultTableModel;

public class StudentManager extends JFrame implements ActionListener {

    private JLabel welcomeLabel;
    private JLabel nameLabel;
    private JTextField nameTextField;
    private JLabel majorLabel;
    private JTextField majorTextField;
    private JButton addButton;
    private JButton deleteButton;
    private JButton quitButton;
    private JTable table;
    private DefaultTableModel model;

    public StudentManager(String name) {
        welcomeLabel = new JLabel(name + ",欢迎登录！");
        nameLabel = new JLabel("学生姓名: ");
        nameTextField = new JTextField(12);
        majorLabel = new JLabel("专业");
        majorTextField = new JTextField();
        addButton = new JButton("添加");
        deleteButton = new JButton("删除");
        quitButton = new JButton("退出");
        String[] colName = {"姓名", "专业"};
        model = new DefaultTableModel(colName, 0);
        table = new JTable(model);
        JScrollPane scrollPane = new JScrollPane(table);

        setTitle("学生管理");
        setSize(400, 400);
        setLocationRelativeTo(null);
        setVisible(true);

        welcomeLabel.setBounds(50, 20, 200, 20);
        nameLabel.setBounds(50, 50, 100, 20);
        nameTextField.setBounds(150, 50, 100, 20);
        majorLabel.setBounds(50, 80, 100, 20);
        majorTextField.setBounds(150, 80, 100, 20);
        addButton.setBounds(80, 110, 60, 20);
        deleteButton.setBounds(150, 110, 60, 20);
        quitButton.setBounds(220, 110, 60, 20);

        Container c = getContentPane();
        JPanel panel = new JPanel();
        panel.setLayout(null);
        panel.add(welcomeLabel);
        panel.add(nameLabel);
        panel.add(nameTextField);
        panel.add(majorLabel);
        panel.add(majorTextField);
        panel.add(addButton);
        panel.add(deleteButton);
        panel.add(quitButton);
        c.setLayout(new BoxLayout(c, BoxLayout.Y_AXIS));
        c.add(panel);
        c.add(scrollPane);

        addButton.addActionListener(this);
        deleteButton.addActionListener(this);
        quitButton.addActionListener(this);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        Object ob = e.getSource();
        if (ob == quitButton) {
            System.exit(0);
        } else if (ob == addButton) {
            String[] stuInfo = {nameTextField.getText(), majorTextField.getText()};
            model.addRow(stuInfo);
            nameTextField.setText("");
            majorTextField.setText("");
        } else if (ob == deleteButton) {
            if (table.getSelectedRow() < 0) {
                JOptionPane.showMessageDialog(null, "请在表格中选中要删除的行");
            } else {
                model.removeRow(table.getSelectedRow());
            }
        }
    }

    public static void main(String[] args) {
        new StudentManager("张三");
    }
}

改写后的代码主要是对变量名和方法名进行规范化、重构，同时对布局管理器进行了修改，更加灵活。程序的功能并没有变化，仅仅是代码更加规范、易读。