RadioButtonDemo.java

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class RadioButtonDemo implements ActionListener

{ 

    private JFrame frame;

	private JRadioButton c1, c2, c3, c4;

	private JLabel label;

	 

	public RadioButtonDemo()

	{

		frame = new JFrame("A Simple Swing App");

		//frame.setSize(600, 400);

		Toolkit tk = frame.getToolkit();

		Dimension dim = tk.getScreenSize();

		int width = (int)dim.getWidth();

		int height = (int)dim.getHeight();

		frame.setSize(width, height);

		 

		frame.setLayout(new FlowLayout());	

		

		c1 = new JRadioButton("Pizza");

		c1.addActionListener(this);

		c1.setFont(new Font("Verdana", Font.BOLD, 18));

		frame.add(c1);

		

		c2 = new JRadioButton("Burger");

		c2.addActionListener(this);

		c2.setFont(new Font("Verdana", Font.BOLD, 18));

		frame.add(c2);

		

		c3 = new JRadioButton("Rolls");

		c3.addActionListener(this);

		c3.setFont(new Font("Verdana", Font.BOLD, 18));

		frame.add(c3);

		

		c4 = new JRadioButton("Beverage");

		c4.addActionListener(this);

		c4.setFont(new Font("Verdana", Font.BOLD, 18));

		frame.add(c4);

		

		ButtonGroup bg = new ButtonGroup();

		bg.add(c1); bg.add(c2); bg.add(c3); bg.add(c4);

		

		label = new JLabel("I show the selected items");

		label.setFont(new Font("Verdana", Font.BOLD, 18));

		label.setForeground(Color.RED);

		frame.add(label);

				

		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

		frame.setVisible(true);

	}

		public void actionPerformed(ActionEvent ae)

	{   label.setText(ae.getActionCommand());		 

	}

	

	public static void main(String[] args)

	{   new RadioButtonDemo();

	}

}