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Explanation of Solution
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...
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