import java.awt.*;

public class JanelaCheckboxGroup extends JanelaCheckbox {
    CheckboxGroup cg = new CheckboxGroup();

    public JanelaCheckboxGroup() {
	c1.setCheckboxGroup(cg);
	c2.setCheckboxGroup(cg);
	c3.setCheckboxGroup(cg);
    }

    public static void main(String[] args) {
	JanelaCheckboxGroup jch = new JanelaCheckboxGroup();
	jch.setVisible(true);
    }

}