12: Looking Good When Things Take Unexpected Turns 289 in Java

Draw USS Code 39 in Java 12: Looking Good When Things Take Unexpected Turns 289

Handling Exceptions 290 The parameter in a catch clause 294 Exception types 295 Who s going to catch the exception 297 Throwing caution to the wind 304 Doing useful things304 Our friends, the good exceptions306 Handle an Exception or Pass the Buck306 Finishing the Job with a finally Clause 311

Putting Capital Letters Where They Belong 317 Breaking Out of a switch Statement318 Comparing Values with a Double Equal Sign 318 Adding Components to a GUI 318 Adding Listeners to Handle Events319 Defining the Required Constructors319 Fixing Non-Static References 319 Staying within Bounds in an Array 320 Anticipating Null Pointers320 Helping Java Find Its Files 321

The Horse s Mouth323 Finding News, Reviews, and Sample Code 324 Improving Your Code with Tutorials 324 Finding Help on Newsgroups324 Checking the FAQs for Useful Info325 Reading Documentation with Additional Commentary 325 Opinions and Advocacy 325

What You Can Expect to Find on the CD-ROM 329 System Requirements 330 Using the CD with Microsoft Windows331 Using the CD with Mac OS332 Running the Java Code That s in This Book 333 Freeware, Shareware, and Just Plain Ware334 JCreator 334 Adobe Acrobat Reader 335 Jindent 336 NetCaptor 336 WinOne 336 And, If You Run into Any Trouble 337

Access Modifiers CD2 Classes, Access, and Multipart ProgramsCD3 Members versus classes CD3 Access modifiers for membersCD4 Putting a drawing on a frameCD7 Directory structure CD9 Using Java packages in JCreator CD10 Making a frame CD12 Sneaking Away from the Original Code CD13 Default access CD15 Crawling back into the package CD17 Protected Access CD19 Putting non-subclasses in the same package CD20 Access Modifiers for Java Classes CD22 Public classes CD23 Nonpublic classes CD23

Go On Click That Button CD25 Events and event handlingCD28 The Java interface CD28 Threads of execution CD30 The keyword thisCD31 Inside the actionPerformed methodCD32 Responding to Things Other Than Button Clicks CD32

Applets 101 CD39 Waiting to be calledCD41 A public classCD41 The Java API (again) CD42 Making Things MoveCD43 The methods in an applet CD45 What to put into all these methods CD45 Responding to Events in an AppletCD47

Telling the System about Your Database CD51 Creating Data CD55 Using SQL commands CD57 Connecting and disconnecting CD57 Retrieving Data CD59

Members versus ClassesCD63 Access Modifiers for MembersCD64 Default access CD65 Protected access CD68 Access Modifiers for Classes CD71

ava 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 intimidating 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

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 5, 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