Chapter 6.8, Problem 52STQ

 Modified code:

//import required header files

import javax.swing.ImageIcon;

import javax.swing.JApplet;

import javax.swing.JButton;

import javax.swing.JLabel;

import java.awt.Color;

import java.awt.Container;

import java.awt.FlowLayout;

import java.awt.Graphics;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

//definition of "visibilityDemo" class

public class VisibilityDemo extends JApplet implements ActionListener

{

    //declare the required variables

    private JLabel response;

    private Container contentPane;

    private JButton aButton;

    //definition of "init()" method

    public void init( )

    {

        //create content pane

        contentPane = getContentPane();

        //set the background color

        contentPane.setBackground(Color.WHITE);

        //create a button

        aButton = new JButton("Push me!");

        //add the action listener to the button

        aButton.addActionListener(this);

        //create a label

response = new JLabel("Thanks. That felt good!");

        //create an object for "ImageIcon"

ImageIcon smileyFaceIcon = new ImageIcon("smiley.gif");

        //display the icon on the window

        response.setIcon(smileyFaceIcon);

        //hide the label until a button is clicked

        response...