JRadioButton（單選按鈕）添加事件監聽

效果圖：

代碼：

import java.io.File ;
import java.awt.Container ;
import java.awt.GridLayout ;
import java.awt.event.WindowAdapter ;
import java.awt.event.ItemListener ;
import java.awt.event.ItemEvent  ;
import java.awt.event.WindowEvent ;
import javax.swing.JFrame ;
import javax.swing.JPanel ;
import javax.swing.JRadioButton ;
import javax.swing.ButtonGroup ;
import javax.swing.BorderFactory ;
import javax.swing.ImageIcon ;
class MyRadio implements ItemListener{
    private String right = "d:" + File.separator + "right.png" ;
    private String wrong = "d:" + File.separator + "wrong.gif" ;
    private JFrame frame = new JFrame("測試信息") ;
    private Container cont = frame.getContentPane() ;
    private JRadioButton jrb1 = new JRadioButton("男",new ImageIcon(right),true) ;
    private JRadioButton jrb2 = new JRadioButton("女",new ImageIcon(wrong),false) ;
    private JPanel pan = new JPanel() ;
    public MyRadio(){
        pan.setBorder(BorderFactory.createTitledBorder("選擇性別")) ;    // 設置一個邊框的顯示條
        pan.setLayout(new GridLayout(1,3)) ;
        pan.add(this.jrb1) ;
        pan.add(this.jrb2) ;
       
        ButtonGroup group = new ButtonGroup() ;
        group.add(this.jrb1) ;
        group.add(this.jrb2) ;
       
        jrb1.addItemListener(this) ;
        jrb2.addItemListener(this) ;

        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 void itemStateChanged(ItemEvent e){
        if(e.getSource()==jrb1){
            jrb1.setIcon(new ImageIcon(right)) ;
            jrb2.setIcon(new ImageIcon(wrong)) ;
        }else{
            jrb1.setIcon(new ImageIcon(wrong)) ;
            jrb2.setIcon(new ImageIcon(right)) ;
       
        }
    }
};
class Tester{
    public static void main(String args[]){
        new MyRadio() ;
    }
};