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

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22 Part I: Revving Up More free books @ www.BingEbook.com This book’s Web site has a special edition of JCreator LE — a version that’s customized especially for Beginning Programming with Java For Dummies, 2nd Edition readers! For details on downloading and installing the special edition of JCreator, see Chapter 2. JCreator runs only on Microsoft Windows. If you’re a Unix, Linux, or Macintosh user, please don’t be offended. All the material in this book applies to you, too. You just have to use a different IDE. My personal recommendations include Eclipse and Netbeans. For details, visit this book’s Web site at http://www. dummies.com/go/bpjavafd.
In This Chapter More free books @ www.BingEbook.com Chapter 2 Setting Up Your Computer Downloading and installing a Java compiler Downloading and installing an integrated development environment Configuring the integrated development environment You’ve arrived home, fresh from your local computer store. You have a brightly colored box (a box with software in it). You tear open the box, take out a CD-ROM, and put the CD-ROM into your computer. In a few minutes (or maybe a few hours), you’re off and running. The software is installed and you’re typing your heart out. This scenario is typical for software that you buy at your neighborhood computer store. But what about the software you need to begin writing your own computer programs? This book tells you how to write Java programs, but before you can write Java programs, you need several pieces of software. You need a Java compiler and a Java virtual machine (JVM, for short). You also need the Java API documentation and an integrated development environment (IDE). You can get this software in a brightly colored box, but it’s easier (and cheaper) to download the software from the Web. In fact, all the software you need is free. It comes as a few downloads — some from Sun Microsystems, and another from this book’s Web site. Who needs another brightly colored box anyway? This book’s examples work on any system that supports Java 5.0 or later. If your computer already has a Java 5.0 compiler, you can skip the next section’s steps. But if your computer doesn’t have a Java compiler, or if you use an older version of Java (a version numbered 1.3, 1.4.2, or something like that) then many of this book’s examples won’t work with your current software configuration. In that case, you must download and install the latest Java compiler. (Even if your computer already has a Java compiler, it never hurts to download and install the latest version.) Just follow the steps in the next section.
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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 and 22: If you already know what computer p
Page 27 and 28: In This Chapter What computer prog
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Page 33 and 34: What is bytecode, anyway? Look at L
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Page 51 and 52: In This Chapter Compiling and runn
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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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More free books @ www.BingEbook.com
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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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} } More free books @ www.BingEbook
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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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