Java: Under the Hood™

JNI - Java Native Interface

The Java Native Interface provides a mechanism for Java code to invoke native code, specifically C and C++ functions. JNI can also be used to embed a JVM into native code so that C and C++ functions can invoke Java code.

It is not difficult to find many benefits of JNI. With all the existing C and C++ legacy code, calling native code from Java code is a necessity.

Course Length:

1 day

Audience:

This course is intended for intermediate Java programmers who have experience developing C/C++ applications and dynamic libraries.

Overview

• Overview of JNI: Interface to native code.
• Using JNI: The steps involved in using JNI.
• "Hello, JNI": Your first JNI application.
• JNI Data Types: How the Java data types map to JNI’s data types.
• The Methods of JNI: A reference for the JNI methods.
• Fields, Methods and Constructors: Accessing members of Java objects from native code.