menuradiobutton.java

由于想一次上传成功 所以将二个教程打包成了一个 这些例子几乎包含了所有java的框架集合

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;

/*
<APPLET
    CODE = menuradiobutton.class
    WIDTH = 350
    HEIGHT = 280 >
</APPLET>
*/

public class menuradiobutton extends JApplet implements ItemListener 
{
    ImageIcon icon = new ImageIcon("item.jpg");

    JRadioButtonMenuItem 
        jradiobuttonmenuitem1 = new JRadioButtonMenuItem("Item 1", icon),
        jradiobuttonmenuitem2 = new JRadioButtonMenuItem("Item 2", icon),
        jradiobuttonmenuitem3 = new JRadioButtonMenuItem("Item 3", icon),
        jradiobuttonmenuitem4 = new JRadioButtonMenuItem("Item 4", icon);

    public void init() 
    {
        Container contentPane = getContentPane();

        JMenuBar jmenubar = new JMenuBar();
        JMenu jmenu = new JMenu("Radio Button Menu Items");

        jmenu.add(jradiobuttonmenuitem1);
        jmenu.add(jradiobuttonmenuitem2);
        jmenu.add(jradiobuttonmenuitem3);
        jmenu.add(jradiobuttonmenuitem4);

        ButtonGroup group = new ButtonGroup();
        group.add(jradiobuttonmenuitem1);
        group.add(jradiobuttonmenuitem2);
        group.add(jradiobuttonmenuitem3);
        group.add(jradiobuttonmenuitem4);

        jradiobuttonmenuitem1.addItemListener(this);
        jradiobuttonmenuitem2.addItemListener(this);
        jradiobuttonmenuitem3.addItemListener(this);
        jradiobuttonmenuitem4.addItemListener(this);

        jmenubar.add(jmenu);
        setJMenuBar(jmenubar);
    }

    public void itemStateChanged(ItemEvent e) 
    {
        JMenuItem jmenuitem = (JMenuItem) e.getSource();
        String itemtext = jmenuitem.getText();

        if(e.getStateChange() == ItemEvent.SELECTED)
            itemtext += " was selected";
        else
            itemtext += " was deselected";

        showStatus(itemtext);
    }
}