Section 1. About this tutorial
What is this tutorial about?
The Java Native Interface (JNI) is a native programming interface that is part of the Java
Software Development Kit (SDK). JNI lets Java code use code and code libraries written in
other languages, such as C and C++. The Invocation API, which is part of JNI, can be used
to embed a Java virtual machine (JVM) into native applications, thereby allowing
programmers to call Java code from within native code.
This tutorial deals with the two most common applications of JNI: calling C/C++ code from
Java programs, and calling Java code from C/C++ programs. We'll cover both the essentials
of the Java Native Interface and some of the more advanced programming challenges that
can arise.
Should I take this tutorial?
This tutorial will walk you through the steps of using the Java Native Interface. You'll learn
how to call native C/C++ code from within a Java application and how to call Java code from
within a native C/C++ application.
All the examples use Java, C, and C++ code, and are written to be portable to both Windows
and UNIX-based platforms. To follow the examples, you must have some experience
programming in the Java language. In addition, you will also need some experience
programming in C or C++. Strictly speaking, a JNI solution could be broken down between
Java programming tasks and C/C++ programming tasks, with separate programmers doing
each task. However, to fully understand how JNI works in both programming environments,
you'll need to be able to understand both the Java and C/C++ code.
We'll also cover a number of advanced topics, including exception handling and
multithreading with native methods. To get the most out of this part of the tutorial, you should
be familiar with the Java platform's security model and have some experience in
multithreaded application development.
The section on Advanced topics on page 19 is separate from the more basic step-by-step
introduction to JNI. Beginning Java programmers may benefit from taking the first two parts
of the tutorial now and returning to the advanced topics at a later time.
See Resources on page 25 for a listing of tutorials, articles, and other references that expand
upon the material presented here.
Tools and components
To run the examples in this tutorial, you will need the following tools and components:
• A Java compiler: javac.exe ships with the SDK.
• A Java virtual machine (JVM): java.exe ships with the SDK.
ibm.com/developerWorks
Presented by developerWorks, your source for great tutorials
Page 2 of 30 Java programming with JNI
4星 · 超过85%的资源 需积分: 10 188 浏览量
2010-11-02
10:45:26
上传
评论
收藏 207KB PDF 举报 
gildping2014-10-09学学如何从上层跳转到下层。
