The Object Oriented

The Object-Oriented
Thought Process
Third Edition

Developer’s Library
ESSENTIAL REFERENCES FOR PROGRAMMING PROFESSIONALS

Developer’s Library books are designed to provide practicing programmers with
unique, high-quality references and tutorials on the programming languages and
technologies they use in their daily work.
All books in the Developer’s Library are written by experttechnology practitioners
who are especially skilled at organizing and presenting information in a way that’s
useful for other programmers.
Key titles include some of the best, most widely acclaimed books within their
topic areas:
PHP & MySQL Web Development

Python Essential Reference

Luke Welling & Laura Thomson
ISBN 978-0-672-32916-6

David Beazley
ISBN-13: 978-0-672-32862-6

MySQLProgramming in Objective-C

Paul DuBois
ISBN-13: 978-0-672-32938-8

Stephen G. Kochan
ISBN-13: 978-0-321-56615-7

Linux Kernel Development

PostgreSQL

Robert Love
ISBN-13: 978-0-672-32946-3

Korry Douglas
ISBN-13: 978-0-672-33015-5

Developer’s Library books are available at most retail and online bookstores, as well
as by subscription from Safari Books Online atsafari.informit.com

Developer’s
Library
informit.com/devlibrary

The Object-Oriented
Thought Process
Third Edition
Matt Weisfeld

Upper Saddle River, NJ • Boston • Indianapolis • San Francisco
New York • Toronto • Montreal • London • Munich • Paris • Madrid
Cape Town • Sydney • Tokyo • Singapore • Mexico City

The Object-Oriented Thought Process, Third Edition
Copyright © 2009 by PearsonEducation
All rights reserved. No part of this book shall be reproduced, stored in a retrieval system, or
transmitted by any means, electronic, mechanical, photocopying, recording, or otherwise,
without written permission from the publisher. No patent liability is assumed with respect to
the use of the information contained herein. Although every precaution has been taken in
the preparation ofthis book, the publisher and author assume no responsibility for errors or
omissions. Nor is any liability assumed for damages resulting from the use of the information contained herein.
ISBN-10: 0-672-33016-4
ISBN-13: 978-0-672-33016-2
Library of Congress Cataloging-in-Publication Data
Weisfeld, Matt A.
The object-oriented thought process / Matt Weisfeld. -- 3rd ed.
p. cm.
Includes index.ISBN 978-0-672-33016-2 (pbk.)
1. Object-oriented programming (Computer science) I. Title.
QA76.64.W436 2009
005.1'17--dc22
2008027242
Printed in the United States of America
First Printing: August 2008

Trademarks
All terms mentioned in this book that are known to be trademarks or service marks have
been appropriately capitalized. Sams Publishing cannot attest to the accuracy of thisinformation. Use of a term in this book should not be regarded as affecting the validity of any
trademark or service mark.

Warning and Disclaimer
Every effort has been made to make this book as complete and as accurate as possible,
but no warranty or fitness is implied. The information provided is on an “as is” basis. The
author and the publisher shall have neither liability norresponsibility to any person or entity
with respect to any loss or damages arising from the information contained in this book or
from the use of the programs accompanying it.

Bulk Sales
Pearson offers excellent discounts on this book when ordered in quantity for bulk
purchases or special sales. For more information, please contact
U.S. Corporate and Government Sales
1-800-382-3419corpsales@pearsontechgroup.com
For sales outside of the U.S., please contact
International Sales
international@pearsoned.com

Acquisitions Editor
Mark Taber
Development
Editor
Songlin Qiu
Managing Editor
Patrick Kanouse
Project Editor
Seth Kerney
Copy Editor
Chrissy White
Indexer
Tim Wright
Proofreader
Matt Purcell
Technical Editor
Jon Upchurch
Publishing
Coordinator
Vanessa Evans
Book...