Part II: Writing Your Own Java Programs - Get a Free Blog

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More free books @ www.BingEbook.com 4 Beginning Programming with Java For Dummies, 2nd Edition 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, send me an e-mail message, or consult a book with instructions tailored to your system. I assume that you can think logically. That’s all there is to computer programming — 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 assume that you know little or nothing about computer programming. This isn’t one of those “all things to all people” books. I don’t please the novice while I tease the expert. I aim this book specifically toward the novice — the person who has never programmed a computer, or has never felt comfortable programming a computer. If you’re one of these people, you’re reading the right book. 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 five 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: Revving Up The chapters in Part I prepare you for the overall programming experience. In these chapters, you find out what programming is all about and get your computer ready for writing and testing programs. Part II: Writing Your Own Java Programs This part covers the basic building blocks — the elements in any Java program, and in any program written using a Java-like language. In this part, you discover how to represent data, and how to get new values from existing values. The program examples are short, but cute.
More free books @ www.BingEbook.com Part III: Controlling the Flow Part III has some of my favorite chapters. In these chapters, you make the computer navigate from one part of your program to another. Think of your program as a big mansion, with the computer moving from room to room. Sometimes the computer chooses between two or more hallways, and sometimes the computer revisits rooms. As a programmer, your job is to plan the computer’s rounds through the mansion. It’s great fun. Part IV: Using Program Units Have you ever solved a big problem by breaking it into smaller, more manageable pieces? That’s exactly what you do in Part IV of this book. You discover the best ways to break programming problems into pieces and to create solutions for the newly found pieces. You also find out how to use other people’s solutions. It feels like stealing, but it’s not. This part also contains a chapter about programming with windows, buttons, and other graphical items. If your mouse feels ignored by the examples in this book, read Chapter 20. Part V: The Part of Tens The Part of Tens is a little beginning programmer’s candy store. In the Part of Tens, you can find lists — lists of tips, resources, and all kinds of interesting goodies. I added an Appendix on this book’s web site to help you feel comfortable with Java’s documentation. I can’t write programs without my Java programming documentation. In fact, no Java programmer can write programs without those all-important docs. These docs are in Web page format, so they’re easy to find and easy to navigate. But if you’re not used to all the terminology, the documentation can be overwhelming. Icons Used in This Book Introduction If you could watch me write this book, you’d see me sitting at my computer, talking to myself. I say each sentence several times in my head. When I have an extra thought, a side comment, 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. 5
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Page 5 and 6: About the Author More free books @
Page 7 and 8: Dedication More free books @ www.Bi
Page 21: If you already know what computer p
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Page 33 and 34: What is bytecode, anyway? Look at L
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Page 45 and 46: Figure 2-1: The docs subdirectory o
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Figure 4-3: A pair of curly braces
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Figure 4-5: The terminology describ
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Figure 4-6: Calling the System.out.
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In This Chapter Chapter 5 Composing
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Figure 5-1: What part of the word
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1. Launch JCreator. 2. From JCreato
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Figure 5-6: The computer substitute
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Also, the table’s story has a sur
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At first you may think this guy has
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Figure 5-8: A helpful error message
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Chapter 5: Composing a Program The
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Avoid the knee-jerk response. Some
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Chapter 5: Composing a Program One
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Figure 5-13: Whadaya mean “NoSuch
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Spaces and indentation Java isn’t
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Chapter 6 Using the Building Blocks
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Figure 6-2: A variable (before and
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Figure 6-4: Reading an assignment s
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Figure 6-6: An extreme close-up of
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Figure 6-7: Getting the value of a
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Methods and assignments Note how I
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You can’t drag statements outside
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In This Chapter Processing whole n
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eflected nicely in Java. In Listing
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Figure 7-4: How to make six kids ve
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Figure 7-5: Hey, bud! Got change fo
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Figure 7-7: Using preincrement. Mor
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To cram a double value into an int
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Look at the bold line of code in Fi
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Are you trying to decide between us
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Figure 7-13: Storing the digits 422
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Chapter 8 Numbers? Who Needs Number
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Figure 8-2: The action in Listing 8
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Figure 8-5: Stop those pots! The co
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I wish I could give you twelve simp
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To represent a lone character in th
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Figure 8-11: The Fahrenheit tempera
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Figure 8-13: The Fahrenheit variabl
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In This Chapter Chapter 9 Forks in
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Figure 9-3: An if statement and its
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Figure 9-4: The allknowing Java pro
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Randomness makes me dizzy When you
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Anyway, whether you’re skinning c
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Anyway, notice that the value of ra
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An elegant way to think about if st
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In This Chapter Chapter 10 Which Wa
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Figure 10-2: Admission prices for B
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Figure 10-4: The choices in Listing
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Figure 10-6: Running the code in Li
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Figure 10-8: A capital offense. Fig
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Listing 10-8: Proud Winners and Sor
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Chapter 11 How to Flick a Virtual S
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Figure 11-2: A fork with eleven pro
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Figure 11-4: How many days until th
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Figure 11-6: From your mind to the
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In This Chapter Chapter 12 Around a
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Figure 12-1: Momma needs a new pair
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Figure 12-4: Look! I rolled a seven
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Figure 12-5: You win sum; you lose
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Figure 12-8: An incorrect run. You
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If you’ve read this whole section
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Figure 12-11: Jumping into a loop.
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Figure 12-13: The strategy in Listi
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In This Chapter Chapter 13 Piles of
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218 Part III: Controlling the Flow
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Figure 15-5: A readable display of
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Figure 15-6: No! Don’t do it! Mor
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Figure 15-7: Here we go loop, do lo
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That’s why my writing a Java prog
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In general, a someEnumTypeName.valu
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Figure 15-10: Entering loops for th
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Figure 15-14: Traveling a second ti
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In This Chapter Using for loops to
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Listing 16-1 uses a for loop — a
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Figure 16-3: A few one-room reports
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Listing 16-3 has a big fat conditio
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guestsIn[6] = 0; On one weekday, bu
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In This Chapter Creating classes C
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Figure 17-2: The code in Listing 17
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The two programs (in Listings 17-1
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Listing 17-4: What It Means to Be a
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Figure 17-6: From one class come th
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Figure 17-7: A table of purchases.
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Chapter 18 Using Methods and Variab
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Putting String variables to good us
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To display a String value, you can
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Figure 18-4: This looks even worse.
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Figure 18-6: Viewing the String cla
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Combining and using data At this po
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Turning strings into numbers The co
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Figure 18-9: Do you have change for
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Packages and import declarations In
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That’s very nice! How about the S
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class Check { int number; double am
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Chapter 19 Creating New Java Method
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The last names in Figure 19-1 may s
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Figure 19-2: Two objects, each with
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Chapter 19: Creating New Java Metho
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} void fillWithData() { Random myRa
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} void display() { NumberFormat cur
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Figure 19-6: Passing a value to a m
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Figure 19-7: Cbj’s account and Br
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In This Chapter Swinging into acti
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Figure 20-1: What a nice window! Mo
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Figure 20-4: The frame in Listing 2
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Taking Action The previous section
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Figure 20-6: A brandnew frame. Figu
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In This Chapter Chapter 21 Ten Sets
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Chapter 22 Ten Useful Classes in th
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Math Do you have any numbers to cru
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• Symbols • && (and operator),
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• C • Calling addInterest Metho
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File➪Open Workspace (JCreator), 3
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errors, diagnosing errors. See also
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input file creating, 222-223 naming
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enum type, 176 Faulty Password Chec
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pack, 352 parentheses and, 328 pars
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method and, 328 parameters and, 336
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testing code, 222-224 troubleshooti
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static, 320-323 String class, 305-3
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