Put JRadioButton into group

Complete source code below will show you, how to create group for JRadioButton.

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COMPLETE SOURCE CODE FOR : PutJRadioButtonIntoGroup.java
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import javax.swing.JRadioButton;
import javax.swing.ButtonGroup;
import javax.swing.JFrame;

import java.awt.GridLayout;

public class PutJRadioButtonIntoGroup
{
public static void main(String[]args)
{
 //Create five radio button that will be put into a group
 JRadioButton firstRadioButton=new JRadioButton("First radio button");
 JRadioButton secondRadioButton=new JRadioButton("Second radio button");
 JRadioButton thirdRadioButton=new JRadioButton("Third radio button");
 JRadioButton fourthRadioButton=new JRadioButton("Fourth radio button");
 JRadioButton fifthRadioButton=new JRadioButton("Fifth radio button");

 //Create a button group using ButtonGroup
 ButtonGroup bg=new ButtonGroup();

 //Add all radio button into created group
 bg.add(firstRadioButton);
 bg.add(secondRadioButton);
 bg.add(thirdRadioButton);
 bg.add(fourthRadioButton);
 bg.add(fifthRadioButton);

 //Create a window using JFrame with title ( Put JRadioButton into group )
 JFrame frame=new JFrame("Put JRadioButton into group");

 //Set JFrame layout to grid layout
 frame.setLayout(new GridLayout(5,1));

 //Add all created button into group
 frame.add(firstRadioButton);
 frame.add(secondRadioButton);
 frame.add(thirdRadioButton);
 frame.add(fourthRadioButton);
 frame.add(fifthRadioButton);

 //Set default close operation for JFrame
 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

 //Set JFrame size
 frame.setSize(300,150);

 //Make JFrame visible
 frame.setVisible(true);
}
}

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JUST COMPILE AND EXECUTE IT
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