C H A P T E R in Java

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C H A P T E R
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Introduction
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HE Java Native Interface (JNI) is a powerful feature of the Java platform Applications that use the JNI can incorporate native code written in programming languages such as C and C++, as well as code written in the Java programming language The JNI allows programmers to take advantage of the power of the Java platform, without having to abandon their investments in legacy code Because the JNI is a part of the Java platform, programmers can address interoperability issues once, and expect their solution to work with all implementations of the Java platform This book is both a programming guide and a reference manual for the JNI The book consists of three parts:
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2 introduces the JNI through a simple example It is a tutorial intended for the beginning users who are unfamiliar with the JNI s 3 to 10 constitute a programmer s guide that gives a broad overview of a number of JNI features We will go though a series of short but descriptive examples to highlight various JNI features and to present the techniques that have proven to be useful in JNI programming s 11 to 13 present the de nitive speci cation for all JNI types and functions These chapters are also organized to serve as a reference manual This book tries to appeal to a wide audience with different needs for the JNI The tutorial and programming guide are targeted toward beginning programmers, whereas experienced developers and JNI implementors may nd the reference sections more useful The majority of readers will likely be developers who use the JNI to write applications The term you in this book will implicitly denote developers who program with the JNI, as opposed to JNI implementors or endusers of applications written using the JNI The book assumes that you have basic knowledge of the Java, C, and C++ programming languages If not, you may refer to one of the many excellent books that are available: The Java Programming Language, Second Edition, by Ken Arnold and James Gosling (Addison-Wesley, 1998), The C Programming Language, Second Edition, by Brian Kernighan and Dennis Ritchie (Prentice Hall, 3
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INTRODUCTION
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1988), and The C++ Programming Language, Third Edition, by Bjarne Stroustrup (Addison-Wesley, 1997) The remainder of this chapter introduces the background, role, and evolution of the JNI
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11 The Java Platform and Host Environment
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Because this book covers applications written in the Java programming language as well as in native (C, C++, etc) programming languages, let us rst clarify the exact scope of the programming environments for these languages The Java platform is a programming environment consisting of the Java virtual machine (VM) and the Java Application Programming Interface (API)1 Java applications are written in the Java programming language, and compiled into a machine-independent binary class format A class can be executed on any Java virtual machine implementation The Java API consists of a set of prede ned classes Any implementation of the Java platform is guaranteed to support the Java programming language, virtual machine, and API The term host environment represents the host operating system, a set of native libraries, and the CPU instruction set Native applications are written in native programming languages such as C and C++, compiled into host-speci c binary code, and linked with native libraries Native applications and native libraries are typically dependent on a particular host environment A C application built for one operating system, for example, typically does not work on other operating systems Java platforms are commonly deployed on top of a host environment For example, the Java Runtime Environment (JRE) is a Sun product that supports the Java platform on existing operating systems such as Solaris and Windows The Java platform offers a set of features that applications can rely on independent of the underlying host environment
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