addButton.addActionListener(this); deleteButton.addActionListener(this); updateButton.addActionListener(this); queryButton.addActionListener(this);

这是一段Java代码，其中通过调用addActionListener方法，为四个按钮对象addButton、deleteButton、updateButton和queryButton注册了事件监听器，这里使用了当前对象作为事件监听器。也就是说，当用户点击任何一个按钮时，程序会调用当前对象中实现的actionPerformed方法。这段代码的作用是为四个按钮对象注册事件监听器。

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。

public class InterfaceCallExample extends JFrame implements ActionListener { private static final long serialVersionUID = 1L; private JButton callButton; private JTable resultTable; private DefaultTableModel tableModel; public InterfaceCallExample() { super("Interface Call Example"); setSize(400, 300); setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); JPanel panel = new JPanel(); callButton = new JButton("查看数据"); callButton.addActionListener(this); panel.add(callButton); add(panel, BorderLayout.NORTH); tableModel = new DefaultTableModel(); tableModel.addColumn("id"); tableModel.addColumn("材料类型"); tableModel.addColumn("状态"); tableModel.addColumn("创建时间"); tableModel.addColumn("更改时间"); resultTable = new JTable(tableModel); add(new JScrollPane(resultTable), BorderLayout.CENTER); } public static void main(String[] args) { InterfaceCallExample example = new InterfaceCallExample(); example.setVisible(true); } @Override public void actionPerformed(ActionEvent e) { if (e.getSource() == callButton) { try { URL url = new URL("http://101.34.120.182:8081/wnapp/productType/getTypeId?category=1&status=0&type="); HttpURLConnection conn = (HttpURLConnection) url.openConnection(); conn.setRequestMethod("GET"); BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream())); String s = reader.readLine(); JSONObject jsonObject = new JSONObject(); JSONObject object = JSONObject.parseObject(s); Object o = object.get("data"); JSONObject object1 = JSONObject.parseObject(o.toString()); ArrayList<Map<String,Object>> list = (ArrayList<Map<String,Object>>) object1.get("list"); for (Map<String,Object> map : list){ String id = map.get("id").toString(); String titleName = map.get("titleName").toString(); String status = map.get("status").toString(); String createTime = map.get("createTime").toString(); String updateTime = map.get("updateTime").toString(); ArrayList<String> strings = new ArrayList<>(); strings.add(id); strings.add(titleName); strings.add(status); strings.add(createTime); strings.add(updateTime); String[] data = strings.toString().replace("[","").replace("]","").split(","); tableModel.addRow(data); } reader.close(); } catch (Exception ex) { ex.printStackTrace(); } } } } 将以上代码获取的每条数据后面添加删除和修改的功能按钮

好的，我可以帮您添加删除和修改的功能按钮。首先，在 `InterfaceCallExample()` 方法中，我们需要创建删除和修改按钮，并将它们添加到 `JPanel` 中。代码如下：

JButton deleteButton = new JButton("删除数据");
deleteButton.addActionListener(this);
panel.add(deleteButton);

JButton updateButton = new JButton("修改数据");
updateButton.addActionListener(this);
panel.add(updateButton);

接下来，在 `actionPerformed()` 方法中，我们可以检查事件源是否为删除或修改按钮，并且获取当前选中的行。代码如下：

int selectedRow = resultTable.getSelectedRow();
if (selectedRow == -1) {
    JOptionPane.showMessageDialog(this, "请先选中要操作的行！");
    return;
}

if (e.getSource() == deleteButton) {
    tableModel.removeRow(selectedRow);
} else if (e.getSource() == updateButton) {
    // 获取当前行的数据，并在新的窗口中显示数据的详细信息
    String id = tableModel.getValueAt(selectedRow, 0).toString();
    String titleName = tableModel.getValueAt(selectedRow, 1).toString();
    String status = tableModel.getValueAt(selectedRow, 2).toString();
    String createTime = tableModel.getValueAt(selectedRow, 3).toString();
    String updateTime = tableModel.getValueAt(selectedRow, 4).toString();
    JOptionPane.showMessageDialog(this, "详细信息：\n" + "id：" + id + "\n材料类型：" + titleName + "\n状态：" + status + "\n创建时间：" + createTime + "\n更改时间：" + updateTime);
}

完整代码如下所示：

public class InterfaceCallExample extends JFrame implements ActionListener {
    private static final long serialVersionUID = 1L;
    private JButton callButton;
    private JButton deleteButton;
    private JButton updateButton;
    private JTable resultTable;
    private DefaultTableModel tableModel;

    public InterfaceCallExample() {
        super("Interface Call Example");
        setSize(400, 300);
        setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        JPanel panel = new JPanel();

        callButton = new JButton("查看数据");
        callButton.addActionListener(this);
        panel.add(callButton);

        deleteButton = new JButton("删除数据");
        deleteButton.addActionListener(this);
        panel.add(deleteButton);

        updateButton = new JButton("修改数据");
        updateButton.addActionListener(this);
        panel.add(updateButton);

        add(panel, BorderLayout.NORTH);

        tableModel = new DefaultTableModel();
        tableModel.addColumn("id");
        tableModel.addColumn("材料类型");
        tableModel.addColumn("状态");
        tableModel.addColumn("创建时间");
        tableModel.addColumn("更改时间");

        resultTable = new JTable(tableModel);
        add(new JScrollPane(resultTable), BorderLayout.CENTER);
    }

    public static void main(String[] args) {
        InterfaceCallExample example = new InterfaceCallExample();
        example.setVisible(true);
    }

    @Override
    public void actionPerformed(ActionEvent e) {
        if (e.getSource() == callButton) {
            try {
                URL url = new URL("http://101.34.120.182:8081/wnapp/productType/getTypeId?category=1&status=0&type=");
                HttpURLConnection conn = (HttpURLConnection) url.openConnection();
                conn.setRequestMethod("GET");
                BufferedReader reader = new BufferedReader(new InputStreamReader(conn.getInputStream()));
                String s = reader.readLine();
                JSONObject jsonObject = new JSONObject();
                JSONObject object = JSONObject.parseObject(s);
                Object o = object.get("data");
                JSONObject object1 = JSONObject.parseObject(o.toString());
                ArrayList<Map<String,Object>> list = (ArrayList<Map<String,Object>>) object1.get("list");
                for (Map<String,Object> map : list){
                    String id = map.get("id").toString();
                    String titleName = map.get("titleName").toString();
                    String status = map.get("status").toString();
                    String createTime = map.get("createTime").toString();
                    String updateTime = map.get("updateTime").toString();
                    ArrayList<String> strings = new ArrayList<>();
                    strings.add(id);
                    strings.add(titleName);
                    strings.add(status);
                    strings.add(createTime);
                    strings.add(updateTime);
                    String[] data = strings.toString().replace("[","").replace("]","").split(",");
                    tableModel.addRow(data);
                }
                reader.close();
            } catch (Exception ex) {
                ex.printStackTrace();
            }
        } else if (e.getSource() == deleteButton || e.getSource() == updateButton) {
            int selectedRow = resultTable.getSelectedRow();
            if (selectedRow == -1) {
                JOptionPane.showMessageDialog(this, "请先选中要操作的行！");
                return;
            }

            if (e.getSource() == deleteButton) {
                tableModel.removeRow(selectedRow);
            } else if (e.getSource() == updateButton) {
                // 获取当前行的数据，并在新的窗口中显示数据的详细信息
                String id = tableModel.getValueAt(selectedRow, 0).toString();
                String titleName = tableModel.getValueAt(selectedRow, 1).toString();
                String status = tableModel.getValueAt(selectedRow, 2).toString();
                String createTime = tableModel.getValueAt(selectedRow, 3).toString();
                String updateTime = tableModel.getValueAt(selectedRow, 4).toString();
                JOptionPane.showMessageDialog(this, "详细信息：\n" + "id：" + id + "\n材料类型：" + titleName + "\n状态：" + status + "\n创建时间：" + createTime + "\n更改时间：" + updateTime);
            }
        }
    }
}