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[JavaLearner]

I'm trying to implement simple sample about using JRadioButton and i don't know Why some Buttons works and others not
That is my code...

Code

GeSHi (java):
import java.awt.FlowLayout;
import java.awt.Font;
import java.awt.event.ItemEvent;
import java.awt.event.ItemListener;
import java.lang.reflect.InvocationTargetException;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;
import javax.swing.JRadioButton;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
 
 
public class RadioButtonFrame extends JFrame {
 
	private static final long serialVersionUID = -4257293733892482733L;
	private JTextField textField = null;
 
	private Font plainFont = null;
	private Font italicFont = null;
	private Font boldFont = null;
	private Font italic_bold_Font = null;
 
	private JRadioButton plainRadioButton ;
	private JRadioButton italicRadioButton;
	private JRadioButton boldRadioButton;
	private JRadioButton italicboldRadioButton;
 
	private ButtonGroup radioGroup ;
 
	public RadioButtonFrame()
	{
		super("Testing RadioButton");
 
		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setSize(300, 100);
		setLayout(new FlowLayout());
 
		textField = new JTextField("Watch the font style change",25);
		add(textField);
 
		plainRadioButton = new JRadioButton("Plain",true);
		italicRadioButton = new JRadioButton("Italic",false);
		boldRadioButton = new JRadioButton("Bold",false);
		italicboldRadioButton = new JRadioButton("Bold/Italic",false);
 
		add(plainRadioButton);
		add(italicRadioButton);
		add(boldRadioButton);
		add(italicboldRadioButton);
 
		//Create Logical relationship between JRadioButton.
		radioGroup = new ButtonGroup();
		radioGroup.add(plainRadioButton);
		radioGroup.add(italicRadioButton);
		radioGroup.add(boldRadioButton);
		radioGroup.add(italicboldRadioButton);
 
		//Create font objects.
		plainFont = new Font("Serif", Font.PLAIN, 14);
		italicFont = new Font("Serif", Font.ITALIC, 14);
		boldFont = new Font("Serif", Font.BOLD, 14);
		italic_bold_Font = new Font("Serif", Font.BOLD + Font.ITALIC  , 14);
		textField.setFont(plainFont);
 
		//Register events for JRadioButton.
		plainRadioButton.addItemListener(new RadioButtonHandler(plainFont));
		italicboldRadioButton.addItemListener(new RadioButtonHandler(italicFont));
		boldRadioButton.addItemListener(new RadioButtonHandler(boldFont));
		italicboldRadioButton.addItemListener(new RadioButtonHandler(italic_bold_Font));
 
		setVisible(true);
	}
 
	private class RadioButtonHandler implements ItemListener{
		private Font font = null ;
 
		public RadioButtonHandler(Font f){
			font = f ;
		}
 
		@Override
		public void itemStateChanged(ItemEvent e) {
			textField.setFont(font);
		}
 
	}
 
	public static void main(String[] args) throws InterruptedException, InvocationTargetException {
		SwingUtilities.invokeAndWait(new Runnable() {
 
			@Override
			public void run() {
				new RadioButtonFrame();
			}
		});
 
	}
 
}
Created by GeSHI 1.0.7.20

Another thing about Generated Code for Class what's the benefit about this
Is this like CLSID in COM Objects in C++ programming.