CheckBoxFrame.java

import java.awt.*;
import java.awt.event.*;
import javax.swing.*;


public class CheckBoxFrame extends JFrame implements WindowListener{
    private Container contentPane;

    public CheckBoxFrame(){
        setTitle("BoxTest");
        setSize(300, 200);
        addWindowListener(this);

        contentPane = this.getContentPane();

        contentPane.add(new CheckBoxPanel());


    }

    public void windowClosing(WindowEvent e){
        System.exit(0);
    }

    public void windowActivated(WindowEvent e){}

    public void windowClosed(WindowEvent e){}

    public void windowDeactivated(WindowEvent e){}

    public void windowDeiconified(WindowEvent e){}

    public void windowIconified(WindowEvent e){}

    public void windowOpened(WindowEvent e){}

}