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Table of Contents xiii Chapter 5: Controlling Program Flow with Decision-Making Statements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .101 Making Decisions (Java if Statements)………………………………………………102 Guess the number ……………………………………………………………………102 She controlled keystrokes from the keyboard…………………………..103 Creating randomness……………………………………………………………….104 The if statement……………………………………………………………………….105 The double equal sign ……………………………………………………………..106 Brace yourself………………………………………………………………………….107 Indenting if statements in your code………………………………………..107 Elseless in Ifrica ……………………………………………………………………….108 Forming Conditions with Comparisons and Logical Operators………….109 Comparing numbers; comparing characters…………………………….109 Comparing objects …………………………………………………………………..110 Importing everything in one fell swoop ……………………………………113 Java s logical operators ……………………………………………………………113 Building a Nest………………………………………………………………………………….115 Choosing among Many Alternatives (Java switch Statements) ………….116 Your basic switch statement…………………………………………………….117 To break or not to break…………………………………………………………..121 Chapter 6: Controlling Program Flow with Loops . . . . . . . . . . . . . . . .123 Repeating Instructions Over and Over Again (Java while Statements) …………………………………………………………………………………..124 Repeating a Certain Number of Times (Java for Statements) …………….127 The anatomy of a for statement ……………………………………………….128 The world premiere of Al s All Wet ………………………………………..130 Repeating Until You Get What You Want (Java do Statements)………….131 Reading a single character……………………………………………………….134 File handling in Java…………………………………………………………………135 Variable declarations and blocks ……………………………………………..135 Loops Made Painless ………………………………………………………………………..136 Don t need no stinking counters ………………………………………………136 Grouping things together …………………………………………………………138 Anatomy of an enhanced for loop…………………………………………….139 Part III: Working with the Big Picture: Object-Oriented Programming ………………………………143 Chapter 7: Thinking in Terms of Classes and Objects . . . . . . . . . . . .145 Defining a Class (What It Means to Be an Account) …………………………..145 Declaring variables and creating objects………………………………….148 Initializing a variable………………………………………………………………..150 Using variables ………………………………………………………………………..150
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xii Java For Dummies, 4th Edition Running Java Programs………………………………………………………………………33 Running a text-based program……………………………………………………34 Running a GUI on its own …………………………………………………………..38 Running a GUI on a Web page (a Java applet) …………………………….41 Chapter 3: Using the Basic Building Blocks . . . . . . . . . . . . . . . . . . . . .45 Speaking the Java Language ……………………………………………………………….45 The grammar and the common names……………………………………….46 The words in a Java program……………………………………………………..47 Checking Out Java Code for the First Time …………………………………………49 Understanding a Simple Java Program………………………………………………..50 The Java class……………………………………………………………………………51 The Java method ……………………………………………………………………….52 The main method in a program………………………………………………….53 How you finally tell the computer to do something ……………………54 Curly braces………………………………………………………………………………57 And Now, a Few Comments…………………………………………………………………59 Adding comments to your code …………………………………………………60 What s Barry s excuse?………………………………………………………………63 Finding javadoc pages ……………………………………………………………….63 Using comments to experiment with your code …………………………64 Typing Your Own Code……………………………………………………………………….65 Part II: Writing Your Own Java Programs………………….71 Chapter 4: Making the Most of Variables and Their Values . . . . . . . .73 Varying a Variable ………………………………………………………………………………73 Assignment Statements………………………………………………………………………75 Understanding the Types of Values That Variables May Have……………..76 An Import Declaration………………………………………………………………………..79 Displaying Text …………………………………………………………………………………..80 Numbers without Decimal Points ……………………………………………………….80 Combining Declarations and Initializing Variables ………………………………82 The Atoms: Java s Primitive Types……………………………………………………..83 The char type…………………………………………………………………………….84 The boolean type……………………………………………………………………….86 The Molecules and Compounds: Reference Types………………………………88 Creating New Values by Applying Operators ………………………………………92 Initialize once, assign often………………………………………………………..94 The increment and decrement operators …………………………………..95 Assignment operators ……………………………………………………………….99
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Table of Contents Introduction…………………………………………………………1 How to Use This Book ………………………………………………………………………….1 Conventions Used in This Book ……………………………………………………………2 What You Don t Have to Read ………………………………………………………………2 Foolish Assumptions ……………………………………………………………………………3 How This Book Is Organized…………………………………………………………………4 Part I: Getting Started ………………………………………………………………….4 Part II: Writing Your Own Java Programs ……………………………………..4 Part III: Working with the Big Picture: Object-Oriented Programming……………………………………………………………………………4 Part IV: Savvy Java Techniques ……………………………………………………5 Part V: The Part of Tens……………………………………………………………….5 Part VI: Appendices……………………………………………………………………..5 Bonus Chapters on the CD-ROM!………………………………………………….5 Icons Used in This Book……………………………………………………………………….6 Where to Go from Here…………………………………………………………………………7 Part I: Getting Started……………………………………………9 Chapter 1: All about Java . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11 What You Can Do with Java ………………………………………………………………..12 Why You Should Use Java …………………………………………………………………..13 Getting Perspective: Where Java Fits In………………………………………………14 Object-Oriented Programming (OOP) …………………………………………………15 Object-oriented languages …………………………………………………………16 Objects and their classes …………………………………………………………..16 What s so good about an object-oriented language?…………………..18 Refining your understanding of classes and objects…………………..20 What s Next? ………………………………………………………………………………………22 Chapter 2: Running Canned Java Programs . . . . . . . . . . . . . . . . . . . . . .23 Downloading and Installing the Java Development Kit (JDK)………………23 Downloading Java………………………………………………………………………25 Installing Java on your computer……………………………………………….27 Preparing to Use an Integrated Development Environment…………………30 JCreator …………………………………………………………………………………….31 Running JCreator for the first time …………………………………………….31
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Contents at a Glance Introduction ………………………………………………………..1 Part I: Getting Started …………………………………………..9 Chapter 1: All about Java…………………………………………………………………………………….11 Chapter 2: Running Canned Java Programs…………………………………………………………23 Chapter 3: Using the Basic Building Blocks …………………………………………………………45 Part II: Writing Your Own Java Programs …………………71 Chapter 4: Making the Most of Variables and Their Values ………………………………….73 Chapter 5: Controlling Program Flow with Decision-Making Statements ……………101 Chapter 6: Controlling Program Flow with Loops………………………………………………123 Part III: Working with the Big Picture: Object-Oriented Programming………………………………143 Chapter 7: Thinking in Terms of Classes and Objects………………………………………..145 Chapter 8: Saving Time and Money: Reusing Existing Code……………………………….173 Chapter 9: Constructing New Objects ……………………………………………………………….205 Part IV: Savvy Java Techniques ……………………………227 Chapter 10: Putting Variables and Methods Where They Belong ……………………….229 Chapter 11: Using Arrays and Collections to Juggle Values………………………………..257 Chapter 12: Looking Good When Things Take Unexpected Turns ……………………..289 Part V: The Part of Tens ……………………………………..315 Chapter 13: Ten Ways to Avoid Mistakes …………………………………………………………..317 Chapter 14: Ten Sets of Web Resources for Java………………………………………………..323 Appendix A: Using the CD-ROM…………………………………………………………………………329 Index ……………………………………………………………..339 Bonus Content on the CD Chapter 15: Sharing Names among the Parts of a Java Program ……………………….CD1 Chapter 16: Responding to Keystrokes and Mouse Clicks……………………………….CD25 Chapter 17: Writing Java Applets ……………………………………………………………………CD39 Chapter 18: Using Java Database Connectivity ……………………………………………….CD51 Appendix B: When to Use Words like public and private …………………………..CD63
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Publisher s Acknowledgments We re proud of this book; please send us your comments through our online registration form located at www.dummies.com/register/. Some of the people who helped bring this book to market include the following: Acquisitions, Editorial, and Media Development Project Editor: Paul Levesque Acquisitions Editor: Katie Feltman Copy Editor: Mary Lagu and Heidi Unger Technical Editor: John Purdum Editorial Manager: Leah Cameron Media Development Specialists: Angela Denny, Kate Jenkins, Steven Kudirka, Kit Malone Media Development Coordinator: Laura Atkinson Media Project Supervisor: Laura Moss Media Development Manager: Laura VanWinkle Editorial Assistant: Amanda Foxworth Sr. Editorial Assistant: Cherie Case Cartoons: Rich Tennant (www.the5thwave.com) Composition Services Project Coordinator: Erin Smith Layout and Graphics: Carl Byers, Lavonne Cook, Denny Hager, Clint Lahnen, Barbara Moore, Barry Offringa, Rashell Smith, Alicia B. South, Ronald Terry Proofreaders: Jessica Kramer, Ethel M. Winslow Indexer: Techbooks Anniversary Logo Design: Richard Pacifico Special Help: Mary Lagu Publishing and Editorial for Technology Dummies Richard Swadley, Vice President and Executive Group Publisher Andy Cummings, Vice President and Publisher Mary Bednarek, Executive Acquisitions Director Mary C. Corder, Editorial Director Publishing for Consumer Dummies Diane Graves Steele, Vice President and Publisher Joyce Pepple, Acquisitions Director Composition Services Gerry Fahey, Vice President of Production Services Debbie Stailey, Director of Composition Services
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Dedication for Jennie, Sam, and Harriet, Ruth and Sam, Jennie and Benjamin, Katie and Abram, and Basheva Author s Acknowledgments Thank you again. (You know who you are.) Barry Burd
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About the Author Dr. Barry Burd received an M.S. degree in Computer Science at Rutgers University and a Ph.D. in Mathematics at the University of Illinois. As a teaching assistant in Champaign-Urbana, Illinois, he was elected five times to the university-wide List of Teachers Ranked as Excellent by their Students. Since 1980, Dr. Burd has been a professor in the Department of Mathematics and Computer Science at Drew University in Madison, New Jersey. When he s not lecturing at Drew University, Dr. Burd leads training courses for professional programmers in business and industry. He has lectured at conferences in the United States, Europe, Australia, and Asia. He is the author of several articles and books, including Eclipse For Dummies and Beginning Programming with Java For Dummies, both from Wiley Publishing, Inc. Dr. Burd lives in Madison, New Jersey, with his wife and two children. In his spare time, he enjoys being a workaholic.
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Java For Dummies , 4th Edition Published by Wiley Publishing, Inc. 111 River Street Hoboken, NJ 07030-5774 www.wiley.com Copyright 2007 by Wiley Publishing, Inc., Indianapolis, Indiana Published by Wiley Publishing, Inc., Indianapolis, Indiana Published simultaneously in Canada No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any 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 written permission of the Publisher, or authorization through payment of the appropriate per-copy fee to the Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923, (978) 750-8400, fax (978) 646-8600. Requests to the Publisher for permission should be addressed to the Legal Department, Wiley Publishing, Inc., 10475 Crosspoint Blvd., Indianapolis, IN 46256, (317) 572-3447, fax (317) 572-4355, or online at http://www.wiley.com/go/permissions. Trademarks: Wiley, the Wiley Publishing logo, For Dummies, the Dummies Man logo, A Reference for the Rest of Us!, The Dummies Way, Dummies Daily, The Fun and Easy Way, Dummies.com, and related trade dress are trademarks or registered trademarks of John Wiley & Sons, Inc. and/or its affiliates in the United States and other countries, and may not be used without written permission. Java is a trademark or registered trademark of Sun Microsystems, Inc. in the United States and other countries. All other trademarks are the property of their respective owners. Wiley Publishing, Inc., is not associated with any product or vendor mentioned in this book. 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 PROFESSIONAL SERVICES. IF PROFESSIONAL ASSISTANCE IS REQUIRED, THE SERVICES OF A COMPETENT PROFESSIONAL PERSON SHOULD BE SOUGHT. NEITHER THE PUBLISHER NOR THE AUTHOR SHALL BE LIABLE FOR DAMAGES ARISING HEREFROM. THE FACT THAT AN ORGANIZATION OR WEBSITE IS REFERRED TO IN THIS WORK AS A CITATION AND/OR A POTENTIAL SOURCE OF FURTHER INFORMATION DOES NOT MEAN THAT THE AUTHOR OR THE PUBLISHER ENDORSES THE INFORMATION THE ORGANIZATION OR WEBSITE MAY PROVIDE OR RECOMMENDATIONS IT MAY MAKE. FURTHER, READERS SHOULD BE AWARE THAT INTERNET WEBSITES LISTED IN THIS WORK MAY HAVE 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 Department within the U.S. at 800-762-2974, outside the U.S. at 317-572-3993, or fax 317-572-4002. For technical support, please visit www.wiley.com/techsupport. 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 Control Number: 2006934836 ISBN-13: 978-0-470-08716-9 ISBN-10: 0-470-08716-1 Manufactured in the United States of America 10 9 8 7 6 5 4 3 2 1 4O/RX/RR/QW/IN
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