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You will find in-depth and progressively advanced coverage of classes and objects, interfaces, exception-handling, threads and multitasking, and packages. In addition, the book describes the Java core library packages, including I/O, standard utilities, language types, and system classes.
The book lets you in on the rationale behind Java's design, direct from the language's creator, as well as the tradeoffs involved in using specific features. With these insights, you will have the understanding you need to begin developing Java applications and applets.
0201634554B04062001
Preface.
1. A Quick Tour of Java.
Getting Started.
Variables.
Comments in Code.
Named Constants.
Flow of Control.
Classes and Objects.
Methods and Parameters.
Arrays.
String Objects.
Extending a Class.
Interfaces.
Exceptions.
Packages.
The Java Infrastructure.
Other Topics Briefly Noted.
A Simple Class.
Fields.
Access Control and Inheritance.
Creating Objects.
Constructors.
Methods.
this.
Overloading Methods.
Static Members.
Garbage Collection and finalize.
main.
The toString Method.
native Methods.
An Extended Class.
What protected Really Means.
Constructors in Extended Classes.
Overriding Methods and Hiding Fields.
Marking Methods and Classes final.
The Object Class.
Abstract Classes and Methods.
Cloning Object.
Extending Classes: How and When.
Designing a Class to be Extended.
An Example Interface.
Single Inheritance versus Multiple Inheritance.
Extending Interfaces.
Implementing Interfaces.
Using an Implementation.
When to Use Interfaces.
Character Set.
Comments.
Tokens.
Identifiers.
Primitive Types.
Literals.
Declarations of Variables.
Array Variables.
Initial Values.
Operator Precedence and Associativity.
Order of Evaluation.
Expression Type.
Type Conversions.
Member Access.
Arithmetic Operators.
Increment and Decrement Operators.
Relational and Conditional Operators.
Bit Operators.
The Conditional Operator ?:.
Assignment Operators.
Package Names.
Statements and Blocks.
if-else.
switch.
while and do-while.
for.
Labels.
break.
continue.
return.
What, No goto?
Creating Exception Types.
throw.
The throws Clause.
try, catch, and finally.
When to Use Exceptions.
Basic String Operations.
String Comparisons.
Utility Functions.
Making Related Strings.
String Conversions.
Strings and char Arrays.
Strings and byte Arrays.
The StringBuffer Class.
Creating Threads.
Synchronization.
wait and notify.
Details of wait and notify.
Thread Scheduling.
Deadlocks.
Suspending Threads.
Interrupting Threads.
Ending Thread Execution.
Ending Application Execution.
Using Runnable.
volatile.
Thread Security and ThreadGroup.
Debugging Threads.
Package Naming.
Package Access.
Package Contents.
Streams.
InputStream.
OutputStream.
Standard Stream Types.
Filter Streams.
PrintStream.
Buffered Streams.
ByteArray Streams.
StringBufferInputStream.
File Streams and FileDescriptor.
Piped Stream.
SequenceInputStream.
LineNumberInputStream.
PushbackInputStream.
StreamTokenizer.
Data Streams.
RandomAccessFile.
The File Class.
FilenameFilter.
The IOException Classes.
BitSet.
Enumeration.
Implementing an Enumeration Interface.
Vector.
Stack.
Dictionary.
Hashtable.
Properties.
Observer/Observable.
Date.
Random.
StringTokenizer.
Class.
Loading Classes.
Wrapper Classes: An Overview.
Boolean.
Character.
Number.
Integer.
Long.
Float and Double.
Standard I/O Stream.
Memory Management.
System Properties.
Creating Processes.
Runtime.
Miscellaneous.
Security.
Math.
Overview.
The C and C++ Mapping.
An Example: Internals for LockableFile.
Strings.
Arrays.
Creating Objects.
Invoking Methods.
A Final Caution.
RuntimeException Classes.
Error Classes.
Beautiful buildings are more than scientific. They are true organisms, spiritually conceived; works of art, using the best technology by inspiration rather than the idiosyncrasies of mere taste or any averaging by the committee mind.-Frank Lloyd Wright
The Java programming language (hereafter called simply "Java") has been warmly received by the world community of software developers and Internet content providers. Users of the Internet and World-Wide Web benefit from access to secure platform-independent applications that can come from anywhere on the Internet. Software developers creating applications in Java benefit by developing code only once, with no need to "port" their applications to every software and hardware platform.
For many, Java is known primarily as a tool to create applets for the World-Wide Web. "Applet" is the term Java uses for a mini-application that runs inside a web page. An applet can perform tasks and interact with the user on their browser page without using resources from the Web server after being downloaded. Some applets may, of course, interact with the server for their own purposes, but that's their business.
Java is indeed valuable for distributed network environments like the Web. However, Java goes well beyond this domain to provide a powerful general purpose programming language suitable for building a variety of applications that either do not depend on network features, or want them for different reasons. Java's ability to execute code on remote hosts in a secure manner is a critical requirement for many organizations.
Other groups use Java as a general-purpose programming language for projects where machine independence is less important. Java's ease of programming and safety features help produce debugged code quickly. Some common programming errors never occur because of features like garbage collection and type-safe references. Modern network-based and graphical user interface based applications that must attend to multiple tasks simultaneously are catered to by Java's support for multi-threading, while the mechanisms of exception handling ease the task of dealing with error conditions. While its built-in tools are powerful, Java the language is itself a simple language in which programmers can quickly become proficient.
Java is designed for maximum portability and is specifically designed to have as few implementation dependencies as possible. An int, for example, is a 32-bit signed two's-complement integer in all Java implementations, whatever the CPU architecture on which the Java program executes. Defining everything possible about the language and its runtime environment enables users to run compiled code anywhere and share code with anyone who has a Java environment.Java shares many language features common to most programming languages in use today. However, unlike C and C++, Java provides automatic storage management and exception handling, integrated with support for threads.
Java should look familiar to C and C++ programmers, because Java was designed with C and C++ constructs where the languages are similar. Other books in this series, and much online documentation, focus on Java applets. This book covers applets at a high level as part of the Java library, but for other references, see the Bibliography.
Chapter 1-A Quick Tour of Java-gives a quick overview of Java. Programmers unfamiliar with object-oriented programming notions should read the quick tour, while programmers already familiar with object-oriented programming paradigms will find the quick tour a useful introduction to the object-oriented features of Java.
Chapters 2, 3, and 4 cover the object-oriented core features of Java, namely, class declarations that define components of a program, and objects manufactured according to class definitions. Chapter 2-Classes and Objects-describes the basis of the Java language. Chapter 3-Extending Classes-describes how an existing class can be extended, or subclassed, to create a new class with new data and behavior. Chapter 4-Interfaces-describes how to declare interface types that are abstract descriptions of behavior that provide maximum flexibility for class designers and implementers.
Chapters 5 and 6 cover standard language constructs common to most languages. Chapter 5-Tokens, Operators, and Expressions-describes the tokens of the language from which statements are constructed, how the tokens and operators are used to build expressions, and how expressions are evaluated. Chapter 6-Control Flow-describes how control statements direct the order of execution of statements.
Chapter 7-Exceptions-describes Java's powerful error-handling capabilities.
Chapter 8-Strings-describes the built-in language and run-time support for String objects.
Chapter 9-Threads-explains Java's implementation of multithreading. Many applications, such as graphical interface-based software, must attend to multiple tasks simultaneously. These tasks must cooperate to behave correctly, and threads meet the needs of cooperative multitasking.
Chapter 10-Packages-describes Java's mechanism for grouping collections of Java classes into their own separate packages.
Chapters 11 through 14 cover the main body of the Java class library packages. Chapter 11-The I/O Package-describes the Java input/output system, based on streams. Chapter 12-Standard Utilities-covers Java utility classes like vectors and hashtables. Chapter 13-Programming with Types-describes Java language types, both individual objects that describe each class and interface, and classes that wrap primitive data types like integers and floating point values into their own object types. Chapter 14-System Programming-leads you through the system classes that provide access to features of the underlying platform.
Appendix A describes Java support for native methods-a means to access code written in the "native" programming language of the underlying platform. Appendix B lists all the runtime exceptions and errors that the Java system itself can throw. Appendix C has tables of information that you may find useful for quick reference purposes.
Finally, a Bibliography lists works that may be interesting for further reading on object-orientation, programming with threads, and other topics.
In a few places we refer to online documentation. Java development environments provide a way to automatically generate documentation (usually HTML documents) from a compiled class using the documentation comments. This documentation is normally viewed using a Web browser.
Contributing Editor Henry McGilton of Trilithon Software played the role of "Chief Editorial Firefighter" to help make this book possible. Series Editor Lisa Friendly contributed dogged perseverance and support.
A veritable multitude of reviewers took time out of their otherwise busy lives to read, edit, advise, revise, and delete material, all in the name of making this a better book. Kevin Coyle performed one of the most detailed editorial reviews at all levels. Karen Bennet, Mike Burati, Patricia Giencke, Steve Gilliard, Bill Joy, Rosanna Lee, Jon Madison, Brian O'Neill, Sue Palmer, Stephen Perelgut, R. Anders Schneiderman, Susan Sim, Bob Sproull, Guy Steele, Arthur Van Hoff, Jim Waldo, Greg Wilson, and Ann Wollrath provided in-depth review. Geoff Arnold, Tom Cargill, Pat Finnegan, Mick Jordan, Doug Lea, Randall Murray, Roger Riggs, Jimmy Torres, and Frank Yellin contributed useful comments and technical information at critical junctures.
Alka Deshpande, Sharon Flank, Nassim Fotouhi, Betsy Halstead, Kee Hinckley, Dr. K. Kalyanasundaram, Patrick Martin, Paul Romagna, Susan Snyder, and Nicole Yankelovich collaborated to make possible the five words of non-ISO-Latin-1 text on page 96. Jim Arnold provided research help on the proper spelling, usage, and etymology of "smoog" and "moorge". Ed Mooney helped with the document preparation. Cookie Callahan, Robert Pierce, and Rita Tavilla provided the support necessary to keep this project going.
Thanks to Kim Polese for supplying us the capsule summary of why Java is important to computer users as well as programmers.
Support and advice were provided at critical moments by Susan Jones, Bob Sproull, Jim Waldo, and Ann Wollrath. And we thank our families, who besides their loving support, would at times drag us out to play when we should have been working, for which we are deeply grateful.
Any errors or shortcomings that remain in this book-despite all the best combined efforts of these myriads-are completely the responsibility of the authors.
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