import java.awt.*;
    public class CheckboxGroupExample
    {
           CheckboxGroupExample(){
           Frame f= new Frame("CheckboxGroup Example");
            CheckboxGroup cbg = new CheckboxGroup();
            Checkbox checkBox1 = new Checkbox("C++", cbg, false);
            checkBox1.setBounds(100,100, 50,50);
            Checkbox checkBox2 = new Checkbox("Java", cbg, true);
            checkBox2.setBounds(100,150, 50,50);
            f.add(checkBox1);
            f.add(checkBox2);
            f.setSize(400,400);
            f.setLayout(null);
            f.setVisible(true);
         }
    public static void main(String args[])
    {
        new CheckboxGroupExample();
    }
    }