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Sams Teach Yourself Java

™

6 in 21 Days

ted by any means, electronic, mechanical, photocopying, recording, or otherwise, without written per-

mission 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 of this book, the pub-

lisher 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.

International Standard Book Number-10: 0-672-32943-3

International Standard Book Number-13: 978-0-672-32943-2

Printed in the United States of America

First Printing: May 2007

10090807 4321

Trademarks

All terms mentioned in this book that are known to be trademarks or service marks have been appro-

priately capitalized. Sams Publishing cannot attest to the accuracy of this information. 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 war-

ranty or fitness is implied. The information provided is on an “as is” basis. The author(s) and the

publisher shall have neither liability nor responsibility 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 CD or pro-

grams accompanying it.

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Library of Congress Cataloging-in-Publication Data

Cadenhead, Rogers.

Sams teach yourself Java 6 in 21 days / Rogers Cadenhead, Laura Lemay.

p. cm.

Includes index.

ISBN 978-0-672-32943-2 (pbk. w/cd)

1. Java (Computer program language) I. Lemay, Laura. II. Title.

QA76.73.J38C333 2007

005.13'3--dc22

2007014568

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Table of Contents
Introduction 1
How This Book Is Organized ..................................................................................2
Who Should Read This Book
..................................................................................4
Conventions Used in This Book
..............................................................................5
WEEK I: The Java Language
DAY 1: Getting Started with Java 9
The Java Language ..............................................................................................10
History of the Language
..............................................................................10
Introduction to Java
....................................................................................11
Selecting a Development Tool
......................................................................11
Object-Oriented Programming
................................................................................12
Objects and Classes
..............................................................................................14
Attributes and Behavior
........................................................................................17
Attributes of a Class of Objects
....................................................................17
Behavior of a Class of Objects
......................................................................18
Creating a Class
..........................................................................................19
Running the Program
..................................................................................21
Organizing Classes and Class Behavior
....................................................................24
Inheritance
................................................................................................24
Creating a Class Hierarchy
..........................................................................26
Inheritance in Action
..................................................................................28
Single and Multiple Inheritance
....................................................................29
Interfaces
..................................................................................................30
Packages
..................................................................................................30
Summary
............................................................................................................31
Q&A
................................................................................................................31
Quiz
..................................................................................................................32
Questions
..................................................................................................32
Answers
....................................................................................................32
Certification Practice
..................................................................................32
Exercises
............................................................................................................33