import java.awt.*;
import java.awt.event.*;

public class CheckboxGUI4 extends Frame {

	public CheckboxGUI4 () {
		super("My GUI");
		setSize(300,300);
		Checkbox checkbox = new Checkbox ("Tick me");
		add(checkbox);
		CheckboxListener cbl = new CheckboxListener();
		checkbox.addItemListener(cbl);
		setVisible(true);
	}

	public static void main (String args[]) {
		new CheckboxGUI4();
	}
}