初学Java-GUI界面

“`
package lianxi;
import java.awt.*;
import javax.swing.*;

public class Lianxi {

public static void main(String[] args) {    Lxi l=new Lxi();}

}
class Lxi extends JFrame
{
private JButton j1,j2;
private JLabel jl1,jl2;
private JCheckBox jb1,jb2,jb3;
private JRadioButton jrb1,jrb2;
//由于单选按钮，每次只能选中一个，所以需要将单选按钮加入到group中
private ButtonGroup btnGroup;
private JPanel pane11,pane12,pane13;

public  Lxi(){    this.j1=new JButton("注册用户");    this.j2=new JButton("取消注册");    this.jl1=new JLabel("你最喜欢的运动");    this.jl2=new JLabel("你的性别");    this.jb1=new JCheckBox("足球");    this.jb2=new JCheckBox("篮球");    this.jb3=new JCheckBox("网球");    this.btnGroup=new ButtonGroup();    this.jrb1=new JRadioButton("男");    this.jrb2=new JRadioButton("女");    this.btnGroup.add(jrb1);    this.btnGroup.add(jrb2);    //实例化Panel,为Panel添加组件    this.pane11=new JPanel();    this.pane12=new JPanel();    this.pane13=new JPanel();    this.pane11.add(this.jl1);    this.pane11.add(this.jb1);    this.pane11.add(this.jb2);    this.pane11.add(this.jb3);    this.pane12.add(this.jl2);    this.pane12.add(this.jrb1);    this.pane12.add(this.jrb2);    this.pane13.add(this.j1);    this.pane13.add(this.j2);    //为JFrame设置布局方式    this.setLayout(new GridLayout(3,1));    //添加组件    this.add(pane11);    this.add(pane12);    this.add(pane13);    this.setSize(300,300);    this.setLocationRelativeTo(null);    this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    this.setVisible(true);}

}

“`