single checkbox demo

package Gui;
/**
 * check box must be in a same ButtonGroup can`t be selected 
 * at the same time
 * 
 * */
import javax.swing.*;
import java.awt.*;
public class CheckBoxDemo extends JFrame{
    
        public void launch(){
            ButtonGroup bp = new ButtonGroup();
            JCheckBox[] cb = new JCheckBox[10];
            for(int i = 0 ;i<10;i++){
                cb[i] = new JCheckBox("cb"+i);
                bp.add(cb[i]);
                add(cb[i]);
            }
            
            setLayout(new FlowLayout());
            setBounds(600,200,300,300);
            setVisible(true);
        }
        public static void main(String[] args) {
            CheckBoxDemo bbb = new CheckBoxDemo();
            bbb.launch();
         
        }

    }