Beginning Java Objects From Concepts to Code, Second Edition JACQUIE BARKER www.traintelco.com Beginning Java Objects: From Concepts to Code, Second Edition Copyright © 2005 by Jacquie Barker All rights reserved. No part of this work may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying, recording, or by any information storage or retrieval system, without the prior written permission of the copyright owner and the publisher. ISBN (pbk): 1-59059-457-6 Printed and bound in the United States of America 9 8 7 6 5 4 3 2 1 Trademarked names may appear in this book. Rather than use a trademark symbol with every occurrence of a trademarked name, we use the names only in an editorial fashion and to the benefit of the trademark owner, with no intention of infringement of the trademark. Lead Editor: Steve Anglin Technical Reviewer: James Huddleston Editorial Board: Steve Anglin, Dan Appleman, Ewan Buckingham, Gary Cornell, Tony Davis, Jason Gilmore, Jonathan Hassell, Chris Mills, Dominic Shakeshaft, Jim Sumser Assistant Publisher: Grace Wong Project Manager: Beckie Stones Copy Edit Manager: Nicole LeClerc Copy Editors: Nicole LeClerc, Ami Knox Production Manager: Kari Brooks-Copony Production Editor: Katie Stence Compositor and Artist: Kinetic Publishing Services, LLC Proofreader: Sue Boshers Indexer: Broccoli Information Management Interior Designer: Van Winkle Design Group Cover Designer: Kurt Krames Manufacturing Manager: Tom Debolski Distributed to the book trade in the United States by Springer-Verlag New York, Inc., 233 Spring Street, 6th Floor, New York, NY 10013, and outside the United States by Springer-Verlag GmbH & Co. KG, Tiergartenstr. 17, 69112 Heidelberg, Germany. In the United States: phone 1-800-SPRINGER, fax 201-348-4505, e-mail orders@springer-ny.com, or visit http://www.springer-ny.com. Outside the United States: fax +49 6221 345229, e-mail orders@springer.de, or visit http://www.springer.de. For information on translations, please contact Apress directly at 2560 Ninth Street, Suite 219, Berkeley, CA 94710. Phone 510-549-5930, fax 510-549-5939, e-mail info@apress.com, or visit http://www.apress.com. The information in this book is distributed on an “as is” basis, without warranty. Although every precaution has been taken in the preparation of this work, neither the author(s) nor Apress shall have any liability to any person or entity with respect to any loss or damage caused or alleged to be caused directly or indirectly by the information contained in this work. The source code for this book is available to readers at http://www.apress.com in the Downloads section. www.traintelco.com In loving memory of “the Weens”—sweet little Shylow and funny little Chloe— who graced our lives with unconditional love for almost 17 years. www.traintelco.com