Chapter 9.4, Problem 36STQ

Explanation of Solution

 Modified code:

//import required header files

import javax.swing.JApplet;

import javax.swing.JButton;

import javax.swing.JTextField;

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 "ColorDemo" class

public class ColorDemo extends JApplet implements ActionListener

{

    //declare the required variables

    public static final int WIDTH = 400;

    public static final int HEIGHT = 300;

    public static final int NUMBER_OF_CHAR = 20;

    private JTextField colorName;

    //definition of "init()" method

    public void init()

    {

        //create content pane

        Container contentPane = getContentPane( );

        //set the background color

        contentPane.setBackground(Color.GRAY);

        //set the layout

        contentPane.setLayout(new FlowLayout( ));

        //create a button

        JButton showButton = new JButton("Show Color");

        //add the action listener to the button

        showButton.addActionListener(this);

        //add a button

        contentPane.add(showButton);

        //create a text field

        colorName = new JTextField(NUMBER_OF_CHAR);

        //add a text field

        contentPane.add(colorName);

    }

    //definition of "actionPerformed" method

    public void actionPerformed(ActionEvent e)

    {

        //create content pane

        Container contentPane = getContentPane( );

        //try block

        try

        {

            //set the background color

            contentPane.setBackground(

            getColor(colorName.getText()));

        }

        //catch block

        catch(UnknownColorException exception)

        {

            //set a text

            colorName...