jradiobuttontest.java

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


public class JRadioButtonTest extends JFrame {
    private JTextField field;
    private Font plainFont,boldFont,italicFont,boldItalicFont;
    private JRadioButton plainButton,boldButton,italicButton,
      boldItalicButton;
    private ButtonGroup radioGroup;
	/**
	 * Launch the application
	 * @param args
	 */
	public static void main(String args[]) {
		try {
			JRadioButtonTest frame = new JRadioButtonTest();
			frame.setVisible(true);
			frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * Create the frame
	 */
	public JRadioButtonTest() {
		super("JRadioButton Test");
		Container container  = getContentPane();
		container.setLayout(new FlowLayout());
		
		field = new JTextField("Watch the font style change",23);
		container.add(field);
		//create radio buttons
		plainButton  = new JRadioButton("Plain",true);
		container.add(plainButton);
		
		boldButton  = new JRadioButton("Bold",false);
		container.add(boldButton);
		
		italicButton  = new JRadioButton("Italic",false);
		container.add(italicButton);
		
		boldItalicButton  = new JRadioButton("BoldItalic",false);
		container.add(boldItalicButton);
		
		//register events for JRadioButton
		RadioButtonHandler handler = new RadioButtonHandler();
		plainButton.addItemListener(handler);
		boldButton.addItemListener(handler);
		italicButton.addItemListener(handler);
		boldItalicButton.addItemListener(handler);
		
		//create logical relationShip between JRadioButtons
		radioGroup = new ButtonGroup();
		radioGroup.add(plainButton);
		radioGroup.add(boldButton);
		radioGroup.add(italicButton);
		radioGroup.add(boldItalicButton);
		
		//Creat font objects
		plainFont = new Font("Serif",Font.PLAIN,14);
		boldFont = new Font("Serif",Font.BOLD,14);
		italicFont = new Font("Serif",Font.ITALIC,14);
		boldItalicFont = new Font("Serif",Font.BOLD+Font.ITALIC,14);
		field.setFont(plainFont);
		
		setSize(800,600);
		setVisible(true);
	}
	private class RadioButtonHandler implements ItemListener
	{
		public void itemStateChanged(ItemEvent event)
		{
			if(event.getSource()==plainButton)
				field.setFont(plainFont);
			if(event.getSource()==boldButton)
				field.setFont(boldFont);
			if(event.getSource()==italicButton)
				field.setFont(italicFont);
			if(event.getSource()==boldItalicButton)
					field.setFont(boldItalicFont);
		}
	}

}