Explanation of Solution
Modified program:
The below highlighted lines are the modified statements in the Listing 6.22.
//import necessary header files
import javax.swing.JApplet;
import javax.swing.JButton;
import javax.swing.ImageIcon;
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;
//define the class "ButtonIconDemo"
public class ButtonIconDemo extends JApplet implements ActionListener
{
    //define the method "init()"
    public void init( )
    {
        //create an object for "Container" class
        Container contentPane = getContentPane( );
        //set the background color
        contentPane.setBackground(Color.WHITE);
        //set the layout
        contentPane.setLayout(new FlowLayout( ));
        //create a button and give name to the button
        JButton sunnyButton = new JButton("Sunny");
        //Create object for "ImageIcon"
ImageIcon smileyFaceIcon = new ImageIcon("smiley.gif");
        //set the icon
        sunnyButton.setIcon(smileyFaceIcon);
        //add the button to the window
        contentPane.add(sunnyButton);
        //add the action to the button
        sunnyButton.addActionListener(this);
        //create a button and give name to the button
        JButton cloudyButton = new JButton("Cloudy");
        //Create object for "ImageIcon"
ImageIcon nastyFaceIcon = new ImageIcon("nasty.gif");
        //set the icon
        cloudyButton...
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