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

public class JRadioButtonDemo extends JPanel {

	static JFrame frame;
	JLabel jlbPicture;
	RadioListener myListener = null;
	public JRadioButtonDemo() {
		// Create the radio buttons and assign Keyboard shortcuts using
		// Mnemonics
		JRadioButton jrbNumbers = new JRadioButton("Numbers");
		jrbNumbers.setMnemonic(KeyEvent.VK_N);
		jrbNumbers.setActionCommand("numbers");
		jrbNumbers.setSelected(true);
		JRadioButton jrbAlphabets = new JRadioButton("Alphabets");
		jrbAlphabets.setMnemonic(KeyEvent.VK_A);
		jrbAlphabets.setActionCommand("alphabets");
		JRadioButton jrbSymbols = new JRadioButton("Symbols");
		jrbSymbols.setMnemonic(KeyEvent.VK_S);
		jrbSymbols.setActionCommand("symbols");
		// Group the radio buttons.
		ButtonGroup group = new ButtonGroup();
		group.add(jrbNumbers);
		group.add(jrbAlphabets);
		group.add(jrbSymbols);
		// Register an action listener for the radio buttons.
		myListener = new RadioListener();
		jrbNumbers.addActionListener(myListener);

		jrbAlphabets.addActionListener(myListener);
		jrbSymbols.addActionListener(myListener);
		// Set up the picture label
		jlbPicture = new JLabel(new ImageIcon("" + "numbers" + ".jpg"));
		// Set the Default Image
		jlbPicture.setPreferredSize(new Dimension(177, 122));
		// Put the radio buttons in a column in a panel
		JPanel jplRadio = new JPanel();
		jplRadio.setLayout(new GridLayout(0, 1));
		jplRadio.add(jrbNumbers);
		jplRadio.add(jrbAlphabets);
		jplRadio.add(jrbSymbols);
		setLayout(new BorderLayout());
		add(jplRadio, BorderLayout.WEST);
		add(jlbPicture, BorderLayout.CENTER);
		setBorder(BorderFactory.createEmptyBorder(20, 20, 20, 20));
	}
	/** Listens to the radio buttons. */
	class RadioListener implements ActionListener {

		public void actionPerformed(ActionEvent e) {
			jlbPicture.setIcon(new ImageIcon("" + e.getActionCommand()
					+ ".jpg"));
		}
	}
	public static void main(String s[]) {
		frame = new JFrame("JRadioButton Usage Demo");
		frame.addWindowListener(new WindowAdapter() {

			public void windowClosing(WindowEvent e) {
				System.exit(0);
			}
		});
		frame.getContentPane().add(new JRadioButtonDemo(),
				BorderLayout.CENTER);
		frame.pack();
		frame.setVisible(true);
	}
}