private JButton button;

这行代码定义了一个名为 button 的私有成员变量，类型为 JButton。私有成员变量只能在类内部访问和修改，不能被外部直接访问。在本例中，button 变量用于存储创建的按钮组件，后续需要为该按钮添加 ActionListener。由于 button 变量是私有的，所以只能在类内部进行访问和修改。

相关问题

class MainFrame extends JFrame { private JTable studentTable; private JTextField idField; private JTextField nameField; private JTextField genderField; private JTextField departmentField; private JTextField dormitoryBuildingField; private JTextField dormitoryNumberField; private JTextField phoneNumberField; private JButton queryButton; private JButton addButton; private JButton deleteButton; private JButton modifyButton; public MainFrame() { // 界面初始化 // ... } // getter和setter方法 // ... } 根据注释补充代码内容

根据注释，可以补充出以下代码内容：

import javax.swing.*;

public class MainFrame extends JFrame {
    private JTable studentTable; // 学生信息表格
    private JTextField idField; // 学号文本框
    private JTextField nameField; // 姓名文本框
    private JTextField genderField; // 性别文本框
    private JTextField departmentField; // 院系文本框
    private JTextField dormitoryBuildingField; // 宿舍楼号文本框
    private JTextField dormitoryNumberField; // 宿舍号文本框
    private JTextField phoneNumberField; // 手机号文本框
    private JButton queryButton; // 查询按钮
    private JButton addButton; // 添加按钮
    private JButton deleteButton; // 删除按钮
    private JButton modifyButton; // 修改按钮

    public MainFrame() {
        // 界面初始化
        // ...

        // 获取学号文本框内容的方法
        public String getId() {
            return idField.getText();
        }
        
        // 设置学号文本框内容的方法
        public void setId(String id) {
            idField.setText(id);
        }
        
        // 获取姓名文本框内容的方法
        public String getName() {
            return nameField.getText();
        }
        
        // 设置姓名文本框内容的方法
        public void setName(String name) {
            nameField.setText(name);
        }
        
        // 获取性别文本框内容的方法
        public String getGender() {
            return genderField.getText();
        }
        
        // 设置性别文本框内容的方法
        public void setGender(String gender) {
            genderField.setText(gender);
        }
        
        // 获取院系文本框内容的方法
        public String getDepartment() {
            return departmentField.getText();
        }
        
        // 设置院系文本框内容的方法
        public void setDepartment(String department) {
            departmentField.setText(department);
        }
        
        // 获取宿舍楼号文本框内容的方法
        public String getDormitoryBuilding() {
            return dormitoryBuildingField.getText();
        }
        
        // 设置宿舍楼号文本框内容的方法
        public void setDormitoryBuilding(String dormitoryBuilding) {
            dormitoryBuildingField.setText(dormitoryBuilding);
        }
        
        // 获取宿舍号文本框内容的方法
        public String getDormitoryNumber() {
            return dormitoryNumberField.getText();
        }
        
        // 设置宿舍号文本框内容的方法
        public void setDormitoryNumber(String dormitoryNumber) {
            dormitoryNumberField.setText(dormitoryNumber);
        }
        
        // 获取手机号文本框内容的方法
        public String getPhoneNumber() {
            return phoneNumberField.getText();
        }
        
        // 设置手机号文本框内容的方法
        public void setPhoneNumber(String phoneNumber) {
            phoneNumberField.setText(phoneNumber);
        }
    }
}

帮我补充这段代码便签管理部分的代码框架： import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Memo extends JFrame { private JTextField titleField; private JTextArea contentArea; private JTextField timeField; private JButton addButton; private JButton editButton; private JButton deleteButton; private JButton viewButton; private JList memoList; private DefaultListModel listModel; public Memo() { // 初始化界面和组件 // 添加事件监听器 // 实现添加、编辑、删除和查看便签信息的功能 } public static void main(String[] args) { Memo memo = new Memo(); memo.setVisible(true); } }

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

public class Memo extends JFrame {
private JTextField titleField;
private JTextArea contentArea;
private JTextField timeField;
private JButton addButton;
private JButton editButton;
private JButton deleteButton;
private JButton viewButton;
private JList memoList;
private DefaultListModel listModel;

public Memo() {
// 初始化界面和组件
setTitle("便签管理");
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(500, 400);
setLocationRelativeTo(null);

JPanel topPanel = new JPanel(new BorderLayout());
JPanel inputPanel = new JPanel(new GridLayout(1, 3));

titleField = new JTextField();
contentArea = new JTextArea();
timeField = new JTextField();

inputPanel.add(titleField);
inputPanel.add(contentArea);
inputPanel.add(timeField);

topPanel.add(inputPanel, BorderLayout.CENTER);

JPanel buttonPanel = new JPanel(new FlowLayout());

addButton = new JButton("添加");
editButton = new JButton("编辑");
deleteButton = new JButton("删除");
viewButton = new JButton("查看");

buttonPanel.add(addButton);
buttonPanel.add(editButton);
buttonPanel.add(deleteButton);
buttonPanel.add(viewButton);

topPanel.add(buttonPanel, BorderLayout.SOUTH);

add(topPanel, BorderLayout.NORTH);

listModel = new DefaultListModel();
memoList = new JList(listModel);
JScrollPane scrollPane = new JScrollPane(memoList);

add(scrollPane, BorderLayout.CENTER);

// 添加事件监听器
addButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// 添加便签信息
String title = titleField.getText();
String content = contentArea.getText();
String time = timeField.getText();

MemoData memo = new MemoData(title, content, time);
listModel.addElement(memo);
}
});

editButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// 编辑便签信息
int index = memoList.getSelectedIndex();
if (index != -1) {
String title = titleField.getText();
String content = contentArea.getText();
String time = timeField.getText();

MemoData memo = new MemoData(title, content, time);
listModel.remove(index);
listModel.add(index, memo);
}
}
});

deleteButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// 删除便签信息
int index = memoList.getSelectedIndex();
if (index != -1) {
listModel.remove(index);
}
}
});

viewButton.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent e) {
// 查看便签信息
int index = memoList.getSelectedIndex();
if (index != -1) {
MemoData memo = (MemoData) listModel.getElementAt(index);
titleField.setText(memo.getTitle());
contentArea.setText(memo.getContent());
timeField.setText(memo.getTime());
}
}
});
}

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

class MemoData {
private String title;
private String content;
private String time;

public MemoData(String title, String content, String time) {
this.title = title;
this.content = content;
this.time = time;
}

public String getTitle() {
return title;
}

public String getContent() {
return content;
}

public String getTime() {
return time;
}

@Override
public String toString() {
return title + " - " + time;
}
}