Java Button Group (ButtonGroup) - Swing Example

// Radio Button
JRadioButton radio1 = new JRadioButton("Item 1");
radio1.setBounds(119, 58, 109, 23);
getContentPane().add(radio1);

JRadioButton radio2 = new JRadioButton("Item 2");
radio2.setBounds(119, 84, 109, 23);
getContentPane().add(radio2);

JRadioButton radio3 = new JRadioButton("Item 3");
radio3.setBounds(119, 110, 109, 23);
getContentPane().add(radio3);

// Set Group
ButtonGroup group = new ButtonGroup();
group.add(radio1);
group.add(radio2);
group.add(radio3);

package com.java.myapp;

import java.awt.EventQueue;

import javax.swing.JFrame;
import java.awt.event.ActionListener;
import java.awt.event.ActionEvent;

import javax.swing.ButtonGroup;
import javax.swing.JOptionPane;
import javax.swing.JButton;
import javax.swing.JRadioButton;

public class MyForm extends JFrame {

	/**
	 * Launch the application.
	 */
	public static void main(String[] args) {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				MyForm frame = new MyForm();
				frame.setVisible(true);
			}
		});
	}

	/**
	 * Create the frame.
	 */
	public MyForm() {

		setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		setBounds(100, 100, 343, 273);
		setTitle("ThaiCreate.Com Java GUI Tutorial");
		getContentPane().setLayout(null);
		
		
		// Radio Button
		final JRadioButton radio1 = new JRadioButton("Item 1");
		radio1.setBounds(119, 58, 109, 23);
		getContentPane().add(radio1);
		
		final JRadioButton radio2 = new JRadioButton("Item 2");
		radio2.setBounds(119, 84, 109, 23);
		getContentPane().add(radio2);
		
		final JRadioButton radio3 = new JRadioButton("Item 3");
		radio3.setBounds(119, 110, 109, 23);
		getContentPane().add(radio3);
		
		// Set Group
		ButtonGroup group = new ButtonGroup();
		group.add(radio1);
        group.add(radio2);
        group.add(radio3);
		
		// Button
		JButton btn = new JButton("Button");
		btn.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent arg0) {
				
				// Check Checkbox 1
				if(radio1.isSelected()){
					JOptionPane.showMessageDialog(null,
							"You select : Item 1");
				} else if (radio2.isSelected()) {
					JOptionPane.showMessageDialog(null,
							"You select : Item 2");
				} else if (radio3.isSelected()) {
					JOptionPane.showMessageDialog(null,
							"You select : Item3");	
				} else {
					JOptionPane.showMessageDialog(null,
							"You not select.");	
				}
				
			}
		});
		btn.setBounds(125, 154, 89, 23);
		getContentPane().add(btn);	
		

		
	}
}