java单选按钮

来源：百度知道 编辑：UC知道 时间：2024/06/05 00:40:11
看看这段代码哪里错？编译的时候问什么说找不到符号cb1？
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
import java.applet.*;
import java.applet.*;
import java.sql.*;

public class Test extends JFrame implements ActionListener{
private static final long serialVersionUID = 1L;
private JPanel jPanel;
private JButton jButton1,jButton2,jButton3;
private JTextArea ta1;
private JTextField tf1;

public Test(String title) {
super(title);
init();
}

private void init() {
jPanel=new JPanel();
jPanel.setLayout(new FlowLayout());
ta1=new JTextArea();
tf1=new JTextField(20);
jButton1=new JButton("查询记录");
jButton2=new JButton("添加用户");
jButton3=new JButton("添加记录");
jButton1.addActionListener(this);
jButton2.addActionListener(this);
jButton3.addActionListener(this);
Checkbox

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

public class Test extends JFrame implements ActionListener{
private static final long serialVersionUID = 1L;
private JPanel jPanel;
private JButton jButton1,jButton2,jButton3;
private JTextArea ta1;
private JTextField tf1;
private Checkbox cb1,cb2;
private CheckboxGroup g；

public Test(String title) {
super(title);
init();
}

private void init() {
jPanel=new JPanel();
jPanel.setLayout(new FlowLayout());
ta1=new JTextArea();
tf1=new JTextField(20);
jButton1=new JButton("查询记录");
jButton2=new JButton("添加用户");
jButton3=new JButton("添加记录");
jButton1.addActionListener(this);
jButton2.addActionListener(this);
jButton3.addActi