单选框，,import java.

单选框，,import java.

import java.awt.Container ;import java.awt.GridLayout ;import java.awt.event.WindowAdapter ;import java.awt.event.WindowEvent ;import javax.swing.JFrame ;import javax.swing.JPanel ;import javax.swing.JRadioButton ;import javax.swing.BorderFactory ;class MyRadio{    private JFrame frame = new JFrame("Welcome TO MLDN") ;    private Container cont = frame.getContentPane() ;    private JRadioButton jrb1 = new JRadioButton("MLDN") ;    private JRadioButton jrb2 = new JRadioButton("MLDNJAVA") ;    private JRadioButton jrb3 = new JRadioButton("智囊团") ;    private JPanel pan = new JPanel() ;    public MyRadio(){        pan.setBorder(BorderFactory.createTitledBorder("请选择最喜爱的网站")) ;  // 设置一个边框的显示条        pan.setLayout(new GridLayout(1,3)) ;        pan.add(this.jrb1) ;        pan.add(this.jrb2) ;        pan.add(this.jrb3) ;        cont.add(pan) ;        this.frame.setSize(300,80) ;        this.frame.setVisible(true) ;        this.frame.addWindowListener(new WindowAdapter(){            public void windowClosing(WindowEvent obj){                System.exit(1) ;            }        }) ;    }};public class JRadioButtonDemo01{    public static void main(String args[]){        new MyRadio() ;    }};//该片段来自于http://byrx.net