Teach Yourself Java in 21 Days

Teach Yourself JAVA in 21 Days
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P2/V4SQC6 TY Java in 21 Days 030-4 louisa 12.31.95
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Day 16 covers interfaces and packages, useful for abstracting protocols of methods to
aid reuse and for the grouping and categorization of classes.
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Day 17 covers exceptions: errors and warnings and other abnormal conditions,
generated either by the system or by you in your programs.
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Day 18 builds on the thread basics you learned on Day 10 to give a broad overview of
multithreading and how to use it to allow different parts of your Java programs to run
in parallel.
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On Day 19, you’ll learn all about the input and output streams in Java’s I/O library.
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Day 20 teaches you about native code—how to link C code into your Java programs
to provide missing functionality or to gain performance.
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Finally, on Day 21, you’ll get an overview of some of the “behind-the-scenes” techni-
cal details of how Java works: the bytecode compiler and interpreter, the techniques
Java uses to ensure the integrity and security of your programs, and the Java garbage
collector.
Conventions Used in This Book
Text that you type and text that should appear on your screen is presented in 
monospace
type:
It will look like this.
to mimic the way text looks on your screen. Variables and placeholders will appear in 
monospace
italic
.
The end of each chapter offers common questions asked about that day’s subject matter with
answers from the authors.
Web Sites for Further Information
Before, while, and after you read this book, there are two Web sites that may be of interest to
you as a Java developer.
The official Java web site is at 
http://java.sun.com/
. At this site, you’ll find the Java
development software, the HotJava web browser, and online documentation for all aspects of
the Java language. It has several mirror sites that it lists online, and you should probably use the
site “closest” to you on the Internet for your downloading and Java Web browsing. There is also
a site for developer resources, called Gamelan, at 
http://www.gamelan.com/
.
This book also has a companion Web site at 
http://www.lne.com/Web/Java/
. Information at
that site includes examples, more information and background for this book, corrections to this
book, and other tidbits that were not included here.
030-4 FM
1/29/96, 8:12 PM
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