Table Of Content

Professional Java™, JDK™ 5 Edition W. Clay Richardson Donald Avondolio Joe Vitale Scot Schrager Mark W. Mitchell Jeff Scanlon Professional Java™, JDK™ 5 Edition Professional Java™, JDK™ 5 Edition W. Clay Richardson Donald Avondolio Joe Vitale Scot Schrager Mark W. Mitchell Jeff Scanlon Professional Java™, JDK™ 5 Edition Published by Wiley Publishing, Inc. 10475 Crosspoint Boulevard Indianapolis, IN 46256-5774 www.wiley.com Copyright©2005 by John Wiley & Sons, Inc. All rights reserved. Published simultaneously in Canada ISBN: 0-7645-7486-8 Manufactured in the United States of America 10 9 8 7 6 5 4 3 2 1 1MA/RR/QR/QV/IN No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form orbyany means, electronic, mechanical, photocopying, recording, scanning, or otherwise, except as permitted under Sections 107 or 108 of the 1976 United States Copyright Act, without either the prior writtenpermission of the Publisher, or authorization through payment of the appropriate per-copy fee totheCopyright Clearance Center, 222 Rosewood Drive, Danvers, MA01923, (978) 750-8400, fax (978) 646-8600. Requests to the Publisher for permission should be addressed to the Legal Department, WileyPublishing, Inc., 10475 Crosspoint Blvd., Indianapolis, IN 46256, (317) 572-3447, fax (317) 572-4355, e-mail:[email protected]. LIMIT OF LIABILITY/DISCLAIMER OF WARRANTY:THE PUBLISHER AND THE AUTHOR MAKE NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY OR COMPLETENESS OF THE CONTENTS OF THIS WORK AND SPECIFICALLY DISCLAIM ALL WARRANTIES, INCLUDING WITHOUT LIMITATION WARRANTIES OF FITNESS FOR A PARTICULAR PURPOSE. NO WARRANTY MAY BE CREATED OR EXTENDED BY SALES OR PROMOTIONAL MATERIALS. THE ADVICE AND STRATEGIES CONTAINED HEREIN MAY NOT BE SUITABLE FOR EVERY SITUATION. THIS WORK IS SOLD WITH THE UNDERSTANDING THAT THE PUBLISHER IS NOT ENGAGED IN RENDERING LEGAL, ACCOUNTING, OR OTHER PROFESSIONALSERVICES. IF PROFESSIONALASSISTANCE IS REQUIRED, THE SERVICES OF ACOMPETENT PROFESSIONALPERSON SHOULD BE SOUGHT. NEITHER THE PUB- LISHER NOR THE AUTHOR SHALLBE LIABLE FOR DAMAGES ARISING HEREFROM. THE FACT THAT AN ORGANIZATION OR WEB SITE IS REFERRED TO IN THIS WORK AS ACITATION AND/OR APOTEN- TIAL SOURCE OF FURTHER INFORMATION DOES NOT MEAN THAT THE AUTHOR OR THE PUB- LISHER ENDORSES THE INFORMATION THE ORGANIZATION OR WEB SITE MAY PROVIDE OR RECOMMENDATIONS IT MAYMAKE. FURTHER, READERS SHOULD BE AWARE THAT INTERNET WEB SITES LISTED IN THIS WORK MAYHAVE CHANGED OR DISAPPEARED BETWEEN WHEN THIS WORK WAS WRITTEN AND WHEN IT IS READ. For general information on our other products and services please contact our Customer Care Depart- ment within the United States at (800) 762-2974, outside the United States at (317) 572-3993, or fax (317)572-4002. Wiley also publishes its books in a variety of electronic formats. Some content that appears in print may not be available in electronic books. Library of Congress Cataloging-in-Publication Data Professional Java, JDK 5 Edition / W. Clay Richardson . . . [et al.].— p. cm. Includes bibliographical references and index. ISBN 0-7645-7486-8 (paper/web site) 1. Java (Computer program language) I. Richardson, W. Clay, 1976- QA76.73.J38P7623 2004 005.13'3—dc22 2004022626 Trademarks:Wiley and the Wiley Publishing logo are trademarks or registered trademarks of John Wiley &Sons, Inc. and/or its affiliates. Java is a trademark of Sun Microsystems, Inc. All other trademarks are the property of their respective owners. Wiley Publishing, Inc., is not associated with any product or ven- dor mentioned in this book. About the Authors W. Clay Richardsonis a software consultant concentrating on agile Java solutions for highly specialized business processes. He has fielded many Java solutions, serving in roles including senior architect, development lead, and program manager. He is a coauthor of More Java PitfallsandProfessional Portal Development with Open Source Tools(Wiley). As an adjunct professor of computer science for Virginia Tech, Richardson teaches graduate-level coursework in object-oriented development with Java. He holds degrees from Virginia Tech and the Virginia Military Institute. Donald Avondoliois a software consultant with over 19 years of experience developing and deploying enterprise applications. He began his career in the aerospace industry developing programs for flight simulators and later became an independent contractor, crafting health-care middleware and low-level device drivers for an assortment of mechanical devices. Most recently, he has built e-commerce applications for numerous high-profile companies, including The Home Depot, Federal Computer Week, the U.S. Postal Service, and General Electric. He is currently a technical architect and developer on several portal deployments. Don serves as an adjunct professor at Virginia Tech, where he teaches progressive object-oriented design and development methodologies, with an emphasis on patterns. Joe Vitalehas been working as a developer for the last ten years. He has worked significantly with the latest Java technologies and also the most-popular open source technologies on the market. Besides being a developer, Vitale is coauthor of Professional Portal Development with Open Source Tools (Wiley), which had a strong focus on open source development and the Java Portlet API formally known as JSR 168. Joe currently works for McDonald Bradley as a development manager, where he manages more than 50 developers. Scot Schragerhas consulted extensively in the domains of pharmaceuticals, supply chain management, and the national security market. He has led and participated in various project teams using Java and Object Oriented Analysis & Design techniques. Most recently, Schrager has been focused on distributed application architecture using J2EE technology. Mark W. Mitchellhas extensive experience in enterprise application integration, particularly Web Services integration between Java and the Microsoft platform. He has developed and deployed several mission-critical Web applications. Mitchell holds a degree in computer science from the University of Virginia. Jeff Scanlonis a senior software engineer at McDonald Bradley in Herndon, Virginia. Scanlon holds both the Sun Certified Java Developer and Microsoft Certified Solutions Developer certifications and has been published in Software Developmentmagazine. Credits Executive Editor Project Coordinator Robert Elliott Erin Smith Development Editor Graphics and Production Specialists Eileen Bien Calabro Beth Brooks Amanda Carter Technical Editor Sean Decker Dreamtech Kelly Emkow Lauren Goddard Production Editor Denny Hager William A. Barton Joyce Haughey Jennifer Heleine Copy Editor Barry Offringa Luann Rouff Quality Control Technicians Editorial Manager John Greenough Kathryn A. Malm Susan Moritz Vice President and Executive Group Publisher Media Development Specialist Richard Swadley Angie Denny Vice President and Publisher Text Design and Composition Joseph B. Wikert Wiley Composition Services Executive Editorial Director Proofreading and Indexing Mary Bednarek TECHBOOKS Production Services This book is dedicated to all those who make the daily sacrifices, especially those who have made the ultimate sacrifice,to ensure our freedom and security.