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

Recommendations

Info

28 Part I: Revving Up Sun’s Web site bundles the basic Java tools in two different ways: More free books @ www.BingEbook.com The Java Runtime Environment (JRE): This bundle includes a Java virtual machine and the Application Programming Interface. (See Chapter 1.) With the JRE, you can run existing Java programs. That’s all. You can’t create new Java programs, because you don’t have a Java compiler. The Java Development Kit (JDK): This bundle includes three tools — a Java compiler, a Two bags of goodies Downloading and installing the JCreator integrated development environment In the previous sections, you get all the tools your computer needs for processing Java programs. This section is different. In this section you get the tool that you need for composing and testing your Java programs. You get JCreator — an integrated development environment for Java. JCreator runs only on Microsoft Windows systems. If you use Linux, Unix, Macintosh, or some other non-Windows system, visit this book’s Web site for further instructions. If you have experience installing software, then downloading and installing JCreator is a routine procedure. Here’s what you do: 1. Look for the JCreator download link on this book’s Web site. 2. Click the download link, and save the file to your computer’s hard drive. Like the Java API documentation, the JCreator installation comes to you as a compressed ZIP file. (See Step 3 in the section entitled “Downloading and installing the Java API documentation.”) 3. Unzip the JCreator installation file. You can extract the file’s contents to any directory on your hard drive. (Just make sure you remember the directory’s name.) 4. Open My Computer on your Windows desktop. Java virtual machine, and the Application Programming Interface. With the JDK, you can create and run your own Java programs. Another name for the JDK is the Java SDK — the Java Software Development Kit. Some people still use the SDK acronym, even though the folks at Sun Microsystems don’t use it anymore. (Actually, the original name was the JDK. Later Sun changed it to the SDK. A few years after that, Sun changed back to the name JDK. As an author, this constant naming and renaming drives me crazy.)
5. From My Computer navigate to whatever directory contains extracted contents of JCreator’s installation file. The directory contains a file named Setup.exe (or just plain Setup). 6. Double-click the Setup file’s icon. In response, the computer fires up JCreator’s installation wizard. 7. Follow the instructions in JCreator’s installation wizard. In the end, the installation wizard may offer to launch JCreator for you. (Alternatively, you can scan your Start menu for a new JCreator folder.) One way or another, you start running JCreator. Running JCreator for the First Time Figure 2-2: Confirming the location of your Java home directory. More free books @ www.BingEbook.com The first time you run JCreator, the program asks for some configuration information. Just follow these steps: 1. If you haven’t already done so, launch JCreator. Chapter 2: Setting Up Your Computer The JCreator Setup Wizard appears on your screen. The wizard’s first page is for File Associations. 2. Accept the File Associations defaults and click Next. The wizard’s next page (the JDK Home Directory page) appears. 3. Look at the text field on the JDK Home Directory page. Make sure that this field displays the name of your Java home directory. (See Figure 2-2.) 29
Page 1 and 2: More free books @ www.BingEbook.com
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
Page 31 and 32: Figure 1-1: My computer understands
Page 33 and 34: What is bytecode, anyway? Look at L
Page 35 and 36: Figure 1-5: Two ways to run a compu
Page 39 and 40: Most versions of Windows come with
Page 41 and 42: In This Chapter More free books @ w
Page 45: Figure 2-1: The docs subdirectory o
Page 49 and 50: Figure 2-4: JCreator’s work area.
Page 51 and 52: In This Chapter Compiling and runn
Page 53 and 54: Figure 3-2: An empty work area. Mor
Page 55 and 56: Figure 3-4: The compiling process i
Page 57 and 58: The version of JCreator that you do
Page 59 and 60: Figure 3-7: The Project Wizard’s
Page 61 and 62: 12. Replace an existing line of cod
Page 65 and 66: Chapter 4 Exploring the Parts of a
Page 71 and 72: you should avoid naming it Canada,
Page 73 and 74: Figure 4-3: A pair of curly braces
Page 77 and 78: Figure 4-5: The terminology describ
Page 81 and 82: Figure 4-6: Calling the System.out.
Page 83 and 84: In This Chapter Chapter 5 Composing
Page 85 and 86: Figure 5-1: What part of the word
Page 87 and 88: 1. Launch JCreator. 2. From JCreato
Page 89 and 90: Figure 5-6: The computer substitute
Page 91 and 92: Also, the table’s story has a sur
Page 93 and 94: At first you may think this guy has
Page 95 and 96: Figure 5-8: A helpful error message
Page 97 and 98:
Chapter 5: Composing a Program The
Page 99 and 100:
Avoid the knee-jerk response. Some
Page 101 and 102:
Chapter 5: Composing a Program One
Page 103 and 104:
Figure 5-13: Whadaya mean “NoSuch
Page 105 and 106:
Spaces and indentation Java isn’t
Page 107 and 108:
Chapter 6 Using the Building Blocks
Page 109 and 110:
Figure 6-2: A variable (before and
Page 111 and 112:
Figure 6-4: Reading an assignment s
Page 113 and 114:
Figure 6-6: An extreme close-up of
Page 115 and 116:
Figure 6-7: Getting the value of a
Page 117 and 118:
Methods and assignments Note how I
Page 119 and 120:
You can’t drag statements outside
Page 121 and 122:
In This Chapter Processing whole n
Page 123 and 124:
eflected nicely in Java. In Listing
Page 125 and 126:
Figure 7-4: How to make six kids ve
Page 127 and 128:
Figure 7-5: Hey, bud! Got change fo
Page 129 and 130:
Figure 7-7: Using preincrement. Mor
Page 131 and 132:
To cram a double value into an int
Page 133 and 134:
Look at the bold line of code in Fi
Page 135 and 136:
Are you trying to decide between us
Page 137 and 138:
Figure 7-13: Storing the digits 422
Page 139 and 140:
Chapter 8 Numbers? Who Needs Number
Page 141 and 142:
Figure 8-2: The action in Listing 8
Page 143 and 144:
More free books @ www.BingEbook.com
Page 145 and 146:
Figure 8-5: Stop those pots! The co
Page 147 and 148:
I wish I could give you twelve simp
Page 149 and 150:
To represent a lone character in th
Page 151 and 152:
Page 153 and 154:
Figure 8-11: The Fahrenheit tempera
Page 155 and 156:
Figure 8-13: The Fahrenheit variabl
Page 157 and 158:
Page 159 and 160:
In This Chapter Chapter 9 Forks in
Page 161 and 162:
Page 163 and 164:
Figure 9-3: An if statement and its
Page 165 and 166:
Figure 9-4: The allknowing Java pro
Page 167 and 168:
Randomness makes me dizzy When you
Page 169 and 170:
Anyway, whether you’re skinning c
Page 171 and 172:
Anyway, notice that the value of ra
Page 173 and 174:
An elegant way to think about if st
Page 175 and 176:
In This Chapter Chapter 10 Which Wa
Page 177 and 178:
Page 179 and 180:
Figure 10-2: Admission prices for B
Page 181 and 182:
Figure 10-4: The choices in Listing
Page 183 and 184:
Page 185 and 186:
Figure 10-6: Running the code in Li
Page 187 and 188:
Figure 10-8: A capital offense. Fig
Page 189 and 190:
} } More free books @ www.BingEbook
Page 191 and 192:
Page 193 and 194:
Page 195 and 196:
Listing 10-8: Proud Winners and Sor
Page 197 and 198:
Page 199 and 200:
Chapter 11 How to Flick a Virtual S
Page 201 and 202:
Page 203 and 204:
Figure 11-2: A fork with eleven pro
Page 205 and 206:
Page 207 and 208:
Page 209 and 210:
Figure 11-4: How many days until th
Page 211 and 212:
Figure 11-6: From your mind to the
Page 213 and 214:
In This Chapter Chapter 12 Around a
Page 215 and 216:
Figure 12-1: Momma needs a new pair
Page 217 and 218:
Figure 12-4: Look! I rolled a seven
Page 219 and 220:
Figure 12-5: You win sum; you lose
Page 221 and 222:
Page 223 and 224:
Figure 12-8: An incorrect run. You
Page 225 and 226:
If you’ve read this whole section
Page 227 and 228:
Page 229 and 230:
Figure 12-11: Jumping into a loop.
Page 231 and 232:
Figure 12-13: The strategy in Listi
Page 233 and 234:
In This Chapter Chapter 13 Piles of
Page 235 and 236:
218 Part III: Controlling the Flow
Page 237 and 238:
Page 239 and 240:
Page 241 and 242:
Page 243 and 244:
Page 245 and 246:
Page 247 and 248:
Page 249 and 250:
Page 251 and 252:
Page 253 and 254:
Page 255 and 256:
Page 257 and 258:
Page 259 and 260:
Page 261 and 262:
Page 263 and 264:
Page 265 and 266:
Page 267 and 268:
Page 269 and 270:
Figure 15-5: A readable display of
Page 271 and 272:
Page 273 and 274:
Figure 15-6: No! Don’t do it! Mor
Page 275 and 276:
Figure 15-7: Here we go loop, do lo
Page 277 and 278:
That’s why my writing a Java prog
Page 279 and 280:
In general, a someEnumTypeName.valu
Page 281 and 282:
Figure 15-10: Entering loops for th
Page 283 and 284:
Figure 15-14: Traveling a second ti
Page 285 and 286:
Page 287 and 288:
In This Chapter Using for loops to
Page 289 and 290:
Listing 16-1 uses a for loop — a
Page 291 and 292:
Figure 16-3: A few one-room reports
Page 293 and 294:
Listing 16-3 has a big fat conditio
Page 295 and 296:
Page 297 and 298:
guestsIn[6] = 0; On one weekday, bu
Page 299 and 300:
Page 301 and 302:
Page 303 and 304:
Page 305 and 306:
In This Chapter Creating classes C
Page 307 and 308:
Figure 17-2: The code in Listing 17
Page 309 and 310:
The two programs (in Listings 17-1
Page 311 and 312:
Listing 17-4: What It Means to Be a
Page 313 and 314:
Page 315 and 316:
Figure 17-6: From one class come th
Page 317 and 318:
Figure 17-7: A table of purchases.
Page 319 and 320:
Chapter 18 Using Methods and Variab
Page 321 and 322:
Putting String variables to good us
Page 323 and 324:
To display a String value, you can
Page 325 and 326:
Figure 18-4: This looks even worse.
Page 327 and 328:
Figure 18-6: Viewing the String cla
Page 329 and 330:
Combining and using data At this po
Page 331 and 332:
Turning strings into numbers The co
Page 333 and 334:
Figure 18-9: Do you have change for
Page 335 and 336:
Packages and import declarations In
Page 337 and 338:
That’s very nice! How about the S
Page 339 and 340:
class Check { int number; double am
Page 341 and 342:
Chapter 19 Creating New Java Method
Page 343 and 344:
The last names in Figure 19-1 may s
Page 345 and 346:
Figure 19-2: Two objects, each with
Page 347 and 348:
Chapter 19: Creating New Java Metho
Page 349 and 350:
Page 351 and 352:
} void fillWithData() { Random myRa
Page 353 and 354:
} void display() { NumberFormat cur
Page 355 and 356:
Figure 19-6: Passing a value to a m
Page 357 and 358:
Figure 19-7: Cbj’s account and Br
Page 359 and 360:
Page 361 and 362:
Page 363 and 364:
In This Chapter Swinging into acti
Page 365 and 366:
Figure 20-1: What a nice window! Mo
Page 367 and 368:
Page 369 and 370:
Figure 20-4: The frame in Listing 2
Page 371 and 372:
Taking Action The previous section
Page 373 and 374:
Figure 20-6: A brandnew frame. Figu
Page 375 and 376:
Page 377 and 378:
In This Chapter Chapter 21 Ten Sets
Page 379 and 380:
Page 381 and 382:
Page 383 and 384:
Chapter 22 Ten Useful Classes in th
Page 385 and 386:
Math Do you have any numbers to cru
Page 387 and 388:
• Symbols • && (and operator),
Page 389 and 390:
• C • Calling addInterest Metho
Page 391 and 392:
File➪Open Workspace (JCreator), 3
Page 393 and 394:
errors, diagnosing errors. See also
Page 395 and 396:
input file creating, 222-223 naming
Page 397 and 398:
enum type, 176 Faulty Password Chec
Page 399 and 400:
pack, 352 parentheses and, 328 pars
Page 401 and 402:
method and, 328 parameters and, 336
Page 403 and 404:
testing code, 222-224 troubleshooti
Page 405 and 406:
static, 320-323 String class, 305-3
Page 407 and 408:
show all

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

You also want an ePaper? Increase the reach of your titles

Delete template?

Save as template?