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Step 4: Write the Native Method Implementation The header file provides a function signature for the implementation of the native method Use javah to create a JNI-style header file (a. Use javac to compile the Java code that you wrote in Step 1. This class also includes a main method that creates a HelloWorld object The following figure illustrates these steps for the Hello World program:Ĭreate a Java class named HelloWorld that declares a native The header and implementation files into a shared library file. The programming language of your choice, such as C or C++. Write the implementation of the native method in.Once you've generated the header file you have the formal signature for

Writing native methods for Java programs is a multi-step process.īegin by writing the Java program. To be sure that you use the correct signatures, it is best to begin by writing and compiling the Java code, as described here.

While "in the real world" you probably have existing C functions that you wish to integrate with Java programs, you will still need to modify the signatures for these C functions to work with the JNI. This lesson assumes that you are starting with neither existing C functions nor Java classes. HelloWorld.java does two things: it declares a native method that displays "Hello World!" and it implements the main method for The "Hello World!" program has one Java class, called HelloWorld. This lesson implements the canonical "Hello World!"

This lesson walks you through the steps necessary to integrate native Compiling and Running a Java Program with a Native Method