import javax.swing.*;

public class checkbox extends JFrame
{
   JCheckBox[] radio=new JCheckBox[5];
   ButtonGroup group=new ButtonGroup();
   JPanel pane=new JPanel();

   public checkbox()
   {
     super("checkbox");
     setSize(300,300);
     for(int i=0;i<radio.length;i++)
     {
        radio[i]=new JCheckBox("dkjf");
        group.add(radio[i]);
        pane.add(radio[i]);
     }
    
     setContentPane(pane);
     addWindowListener(new quitEvent());
     show();
   }

  public static void main(String args[])
  {
     checkbox check=new checkbox();
  }
}