Java Basic(64)-JcheckBox

import java.awt.*;

import java.awt.event.*;

import javax.swing.*;

public class Gui extends JFrame{

private JTextField tf;

private JCheckBox boldbox;

private JCheckBox italicbox;

public Gui(){

super("the title");

setLayout(new FlowLayout());

tf = new JTextField("This is a sentence", 20);

tf.setFont(new Font("Serif", Font.PLAIN, 14));

add(tf);

boldbox = new JCheckBox("bold");

italicbox = new JCheckBox("italic");

add(boldbox);

add(italicbox);

HandlerClass handler = new HandlerClass();

boldbox.addItemListener(handler);

italicbox.addItemListener(handler);

}

private class HandlerClass implements ItemListener{

}

}