Put JCheckBox into group

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

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COMPLETE SOURCE CODE FOR : PutJCheckBoxIntoGroup.java
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import javax.swing.JFrame;
import javax.swing.JCheckBox;
import javax.swing.ButtonGroup;

import java.awt.GridLayout;

public class PutJCheckBoxIntoGroup
{
public static void main(String[]args)
{
 //Create a window using JFrame with title ( Put JCheckBox into group )
 JFrame frame=new JFrame("Put JCheckBox into group");

 //Create check box using JCheckBox
 JCheckBox checkBox1=new JCheckBox("Duck");
 JCheckBox checkBox2=new JCheckBox("Chicken");
 JCheckBox checkBox3=new JCheckBox("Cow");
 JCheckBox checkBox4=new JCheckBox("Sheep");

 //Create layout that will be use by JFrame
 GridLayout gl=new GridLayout(4,1);

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

 //Add all created check box into button group
 bg.add(checkBox1);
 bg.add(checkBox2);
 bg.add(checkBox3);
 bg.add(checkBox4);

 //Set JFrame layout
 frame.setLayout(gl);

 //Add all created check box into JFrame
 frame.add(checkBox1);
 frame.add(checkBox2);
 frame.add(checkBox3);
 frame.add(checkBox4);

 frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
 frame.setSize(350,200);
 frame.setVisible(true);
}
}

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JUST COMPILE AND EXECUTE IT
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