testjradiobutton.java

Java讲义与实例

import javax.swing.*;
import java.awt.event.*;
public class testJRadioButton extends JFrame{
    JPanel jpanel1;
    JRadioButton jrb1=new JRadioButton("RadionButton1");
    JRadioButton jrb2=new JRadioButton("RadionButton2",true);
    JRadioButton jrb3=new JRadioButton("RadionButton3");
    ButtonGroup buttongroup1=new ButtonGroup();
    public testJRadioButton(){
        super("testJRadionButton");
        setSize(300,100);
        jpanel1=new JPanel();
        buttongroup1.add(jrb1);
        buttongroup1.add(jrb2);
        jpanel1.add(jrb1);
        jpanel1.add(jrb2);
        jpanel1.add(jrb3);
        this.setContentPane(jpanel1);
        }
    public static void main(String[] arg){
        testJRadioButton trb=new testJRadioButton();
        trb.show();
        trb.addWindowListener(new WindowAdapter(){
        public void windowClosing(WindowEvent e){
            System.exit(0);
            }
        });
        }
    }