用户各种按钮

package Layout;
import java.awt.*;
import javax.swing.*;

public class UserLogin extends JFrame {
private JPanel p1 =new JPanel();    //面板
private JPanel p2 =new JPanel();//new FlowLayout(FlowLayout.LEFT)
private JPanel p3 =new JPanel();
private JPanel p4 =new JPanel();
private JPanel p5 =new JPanel();
private JPanel p6 =new JPanel();
private JPanel p7 =new JPanel();
private JButton b1 = new JButton("登录");
private JButton b2 = new JButton("取消");
private  JCheckBox c1 = new JCheckBox("音乐");//复选按钮
private  JCheckBox c2 = new JCheckBox("体育");
private  JCheckBox c3 = new JCheckBox("美术");
private  JRadioButton r1 = new JRadioButton("男");  //单选按钮
private  JRadioButton r2 = new JRadioButton("女");
private  ButtonGroup g1 = new ButtonGroup();
private  ButtonGroup g2 = new ButtonGroup();
private JLabel l1 = new JLabel("用户名");//标签
private JLabel l2 = new JLabel("密    码");
private JLabel l3 = new JLabel("特    长");
private JLabel l4 = new JLabel("性    别");
private JTextField t = new JTextField(10);//文本框
private JPasswordField w = new JPasswordField(10); //密码框
private String str1[] = {"北京","上海","天津","重庆"};
private String str2[] = {"1","2","3","4"};
private JComboBox xlk = new JComboBox(str1);  //下拉框
private JList lb = new JList(str2);  //列表
private JScrollPane gd = new JScrollPane(lb);  //滚动条
public UserLogin (){
    
    this.setLayout(new GridLayout(7,2));  //网格布局管理器
    g1.add(c1);    g1.add(c2);     g1.add(c3);
    g2.add(r1);    g2.add(r2);
    p1.add(l1);    p1.add(t);
    p2.add(l2);    p2.add(w);
    p3.add(l3);    p3.add(c1);     p3.add(c2);     p3.add(c3);
    p4.add(l4);    p4.add(r1);     p4.add(r2);
    p5.add(b1);    p5.add(b2);
    p6.add(xlk);
    lb.setVisibleRowCount(3);  //滚动条
    p7.add(gd);
    this.add(p1);
    this.add(p2);
    this.add(p3);
    this.add(p4);
    this.add(p5);
    this.add(p6);
    this.add(p7);
    this.setTitle("用户登录");
    this.setSize(500,400);
//    this.setResizable(false);  //是否允许·更改大小
    this.setLocation(1,1);
    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
  //   this.pack();
    this.setVisible(true);
    
}
    public static void main(String[] args) {
    UserLogin l = new UserLogin();

    }

}