[CODE]import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class MenuDemo extends JFrame{
private JMenuBar menubar;

private JMenu menu,menufile;

private JRadioButtonMenuItem radio;

private JRadioButton btn;

private JTextField t;

private int menucount = 0,btncount = 0;

public MenuDemo(String title){
super(title);
setLayout(new FlowLayout());

menubar = new JMenuBar();
setJMenuBar(menubar);

menu = new JMenu("File");
menubar.add(menu);

menufile = new JMenu("Radio");
menu.add(menufile);

t = new JTextField(20);
t.setHorizontalAlignment(JTextField.CENTER);

radio = new JRadioButtonMenuItem("RadioButtonMenuItem");
radio.addItemListener(new ItemListener()
{
public void itemStateChanged(ItemEvent e){
menucount++;
t.setText("Click JRadioButtonMenuItem: " + menucount);
}
});

menufile.add(radio);

btn = new JRadioButton("JRadioButton");
btn.addItemListener(new ItemListener()
{
public void itemStateChanged(ItemEvent e){
btncount++;
t.setText("Click JRadioButton: " + btncount);
}
});

menufile.add(btn);

getContentPane().add(t);
}
public static void main(String [] args){
MenuDemo md = new MenuDemo("Text");
md.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
md.setSize(300,100);
md.setVisible(true);
}
}[/CODE]

在JMenu里面用的不是JRadioButton，而是JRadioButtonMenuItem，这个也不算是难题啊，你应该可以自己做出来的