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In this part . . . Become acquainted with Java. Find out what Java is all about and whether you do (or don t) want to use Java. If you ve heard things about Java and aren t sure what they mean, the material in this part can help you. If you re staring at your computer, wondering how you re going to get a Java program running, this part has the information that you need. Maybe you ve told people that you re a Java expert, and now you need to do some seri- ous bluffing. If so, this part of the book is your crash course in Java. (Of course, if the word bluffing describes you accurately, you may also want to pick up a copy of Ethics For Dummies.) Become acquainted with Java. Find out what Java is all about and whether you do (or don t) want to use Java. If you ve heard things about Java and aren t sure what they mean, the material in this part can help you. If you re staring at your computer, wondering how you re going to get a Java program running, this part has the information that you need. Maybe you ve told people that you re a Java expert, and now you need to do some seri- ous bluffing. If so, this part of the book is your crash course in Java. (Of course, if the word bluffing describes you accurately, you may also want to pick up a copy of Ethics For Dummies.)
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Part I Getting Started
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8 Java For Dummies, 4th Edition
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Introduction If you don t remember what such-and-such means, see blah-blah-blah, or For more information, read blahbity-blah-blah. This icon calls attention to useful material that you can find online. (You don t have to wait long to see one of these icons. I use one at the end of this introduction!) I use this icon to point out useful stuff that s on the CD (obviously). Occasionally, I run across a technical tidbit. The tidbit may help you understand what the people behind the scenes (the people who developed Java) were thinking. You don t have to read it, but you may find it useful. You may also find the tidbit helpful if you plan to read other (more geeky) books about Java. Where to Go from Here If you ve gotten this far, you re ready to start reading about Java. Think of me (the author) as your guide, your host, your personal assistant. I do everything I can to keep things interesting and, most importantly, help you understand. If you like what you read, send me a note. My e-mail address, which I created just for comments and questions about this book, is JavaForDummies@ BurdBrain.com. And don t forget for the latest updates, visit one of this book s support Web sites. The support sites addresses are www.dummies. com/go/javafordummies4e and www.BurdBrain.com.
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Java For Dummies, 4th Edition In Chapter 15, you combine several smaller programs to create a bigger program. As part of that process, you find out which parts of one program are of use to any other program. You get an expanded description of the material in Appendix B. In Chapter 16, you handle button clicks, keystrokes, and other such things. You find out about one additional Java language feature (something like a Java class) called an interface. In Chapter 17, you deal with Java applets. You put applets on Web pages, draw things, and make things move. You create a small game that visitors to your site can play. In Chapter 18, you see an example of Java database handling. The example takes you from start to finish from establishing a connection and creating a table to adding rows and making queries. Note: For you Web fanatics out there, you can also read the bonus chapters on the Web at www.dummies.com/go/javafordummies4e. Icons Used in This Book If you could watch me write this book, you d see me sitting at my computer, talking to myself. I say each sentence in my head. Most of the sentences I mutter several times. When I have an extra thought, a side comment, or something that doesn t belong in the regular stream, I twist my head a little bit. That way, whoever s listening to me (usually nobody) knows that I m off on a momentary tangent. Of course, in print, you can t see me twisting my head. I need some other way of setting a side thought in a corner by itself. I do it with icons. When you see a Tip icon or a Remember icon, you know that I m taking a quick detour. Here s a list of icons that I use in this book. A tip is an extra piece of information something helpful that the other books may forget to tell you. Everyone makes mistakes. Heaven knows that I ve made a few in my time. Anyway, when I think people are especially prone to make a mistake, I mark it with a Warning icon. Question: What s stronger than a Tip, but not as strong as a Warning? Answer: A Remember icon.
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Introduction map solutions to big problems. (Sure, the examples in these chapters aren t big, but the examples involve big ideas.) In bite-worthy increments, you discover how to design classes, reuse existing classes, and construct objects. Have you read any of those books that explain object-oriented programming in vague, general terms? I m very proud to say that Java For Dummies, 4th Edition, isn t like that. In this book, I illustrate each concept with a simple-yetconcrete program example. Part IV: Savvy Java Techniques If you ve tasted some Java and want more, you can find what you need in this part of the book. This part s chapters are devoted to details the things that you don t see when you first glance at the material. So, after you read the earlier parts and write some programs on your own, you can dive in a little deeper by reading Part IV. Part V: The Part of Tens The Part of Tens is a little Java candy store. In the Part of Tens, you can find lists lists of tips for avoiding mistakes, resources, and all kinds of interesting goodies. Appendices The book has two appendices. One appendix tells you all about this book s CD-ROM (what s on the CD, how to use the CD, how to make the CD look like a UFO at night, and so on). The other appendix (housed on the CD, as a matter of fact) summarizes some important rules for writing Java programs. To find out which parts of your code spill over automatically into other peoples code, read the second appendix. Additional Bonus Chapters on the CD-ROM! You ve read the Java For Dummies book, seen the Java For Dummies movie, worn the Java For Dummies T-shirt, and eaten the Java For Dummies candy. What more is there to do? That s easy. Just pop in the book s CD-ROM and you can find four additional chapters:
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Java For Dummies, 4th Edition On the other hand, if you ve done these things (maybe in Visual Basic, COBOL, or C++), you ll discover some interesting plot twists in Java. The developers of Java took the best ideas in object-oriented programming, streamlined them, reworked them, and reorganized them into a sleek, powerful way of thinking about problems. You ll find many new, thought- provoking features in Java. As you find out about these features, many of them will seem very natural to you. One way or another, you ll feel good about using Java. How This Book Is Organized This book is divided into subsections, which are grouped into sections, which come together to make chapters, which are lumped finally into six parts. (When you write a book, you get to know your book s structure pretty well. After months of writing, you find yourself dreaming in sections and chapters when you go to bed at night.) The parts of the book are listed here. Part I: Getting Started This part is your complete, executive briefing on Java. It includes a What is Java? chapter and a complete set of instructions on installing and running Java. It also has a jump-start chapter Chapter 3. In this chapter, you visit the major technical ideas and dissect a simple program. Part II: Writing Your Own Java Programs Chapters 4 through 6 cover the basic building blocks. These chapters describe the things that you need to know so you can get your computer humming along. If you ve written programs in Visual Basic, C++, or any another language, some of the material in Part II may be familiar to you. If so, you can skip some sections or read this stuff quickly. But don t read too quickly. Java is a little different from some other programming languages, especially in the things that I describe in Chapter 4. Part III: Working with the Big Picture: Object-Oriented Programming Part III has some of my favorite chapters. This part covers the all-important topic of object-oriented programming. In these chapters, you find out how to
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Introduction If you write C++ programs for a living, glance at Chapter 3, skim Chapters 4 through 6, and start reading seriously in Chapter 7. (Java is a bit different from C++ in the way it handles classes and objects.) If you write Java programs for a living, come to my house and help me write Java For Dummies, 5th Edition. If you want to skip the sidebars and the Technical Stuff icons, please do. In fact, if you want to skip anything at all, feel free. Foolish Assumptions In this book, I make a few assumptions about you, the reader. If one of these assumptions is incorrect, you re probably okay. If all these assumptions are incorrect . . . well, buy the book anyway. I assume that you have access to a computer. Here s the good news: You can run the code in this book on almost any computer. The only computers that you can t use to run this code are ancient things that are more than six years old (give or take a few years). I assume that you can navigate through your computer s common menus and dialog boxes. You don t have to be a Windows, Unix, or Macintosh power user, but you should be able to start a program, find a file, put a file into a certain directory . . . that sort of thing. Most of the time, when you practice the stuff in this book, you re typing code on your keyboard, not pointing and clicking your mouse. On those rare occasions when you need to drag and drop, cut and paste, or plug and play, I guide you carefully through the steps. But your computer may be configured in any of several billion ways, and my instructions may not quite fit your special situation. So, when you reach one of these platform-specific tasks, try following the steps in this book. If the steps don t quite fit, consult a book with instructions tailored to your system. I assume that you can think logically. That s all there is to programming in Java thinking logically. If you can think logically, you ve got it made. If you don t believe that you can think logically, read on. You may be pleasantly surprised. I make very few assumptions about your computer programming experience (or your lack of such experience). In writing this book, I ve tried to do the impossible. I ve tried to make the book interesting for experienced programmers, yet accessible to people with little or no programming experience. This means that I don t assume any particular programming background on your part. If you ve never created a loop or indexed an array, that s okay.
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Java For Dummies, 4th Edition Conventions Used in This Book Almost every technical book starts with a little typeface legend, and Java For Dummies, 4th Edition, is no exception. What follows is a brief explanation of the typefaces used in this book: New terms are set in italics. If you need to type something that s mixed in with the regular text, the characters you type appear in bold. For example: Type MyNewProject in the text field. You also see this computeresefont. I use computerese for Java code, filenames, Web page addresses (URLs), on-screen messages, and other such things. Also, if something you need to type is really long, it appears in computerese font on its own line (or lines). You need to change certain things when you type them on your own computer keyboard. For instance, I may ask you to type public class Anyname which means that you type public class and then some name that you make up on your own. Words that you need to replace with your own words are set in italicized computerese. What You Don t Have to Read Pick the first chapter or section that has material you don t already know and start reading there. Of course, you may hate making decisions as much as I do. If so, here are some guidelines that you can follow: If you already know what kind of an animal Java is and know that you want to use Java, skip Chapter 1 and go straight to Chapter 2. Believe me, I won t mind. If you already know how to get a Java program running, skip Chapter 2 and start with Chapter 3. If you write programs for a living but use any language other than C or C++, start with Chapter 2 or 3. When you reach Chapters 5 and 6, you ll probably find them to be easy reading. When you get to Chapter 7, it ll be time to dive in. If you write C (not C++) programs for a living, start with Chapters 3 and 4 but just skim Chapters 5 and 6.
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Introduction Java is good stuff. I ve been using it for years. I like Java because it s very orderly. Almost everything follows simple rules. The rules can seem intim idating at times, but this book is here to help you figure them out. So, if you want to use Java and want an alternative to the traditional techie, soft-cover book, sit down, relax, and start reading Java For Dummies, 4th Edition. How to Use This Book I wish I could say, Open to a random page of this book and start writing Java code. Just fill in the blanks and don t look back. In a sense, this is true. You can t break anything by writing Java code, so you re always free to experiment. But let me be honest. If you don t understand the bigger picture, writing a program is difficult. That s true with any computer programming language not just Java. If you re typing code without knowing what it s about, and the code doesn t do exactly what you want it to do, you re just plain stuck. So, in this book, I divide Java programming into manageable chunks. Each chunk is (more or less) a chapter. You can jump in anywhere you want Chapter 5, Chapter 10, or wherever. You can even start by poking around in the middle of a chapter. I ve tried to make the examples interesting without making one chapter depend on another. When I use an important idea from another chapter, I include a note to help you find your way around. In general, my advice is as follows: If you already know something, don t bother reading about it. If you re curious, don t be afraid to skip ahead. You can always sneak a peek at an earlier chapter if you really need to do so.
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