Test JNI in eclipse

Step 1: Write the Java code

Create a Java class namedHelloWorldThat declares a native method. This class also includesmainMethod that createsHelloWorldObject and callthe native method.

Step 2: Compile the Java code

UsejavacTo compile the Java code that you wrote inStep 1.

Step 3: Create the. h file

UsejavahTo create a JNI-style header file (.hFile) fromHelloWorldClass. the header file provides a function signature for the implementation of the native
MethoddisplayHelloWorld.

Step 4: Write the native method implementation

Write the implementation for the native method in a native language (such as ansi c) source file. The implementation will be a regular function that's integrated with your Java class.

Step 5: create a shared library

Use the C compiler to compile.hFile and.cFile that you created inSteps 3 and 4Into a shared library. in Windows 95/NT terminology, a shared library
Is called a dynamically loadable library (DLL ).

Step 6: run the program

And finally, usejava, The Java interpreter, to run the program.

Package JNI;

Public class helloworld {

Public native void displayhelloworld ();

Static {
// System. loadlibrary ("hello ");
Runtime. getruntime (). loadlibrary ("hello ");
}

Public static void main (string [] ARGs ){
New helloworld (). displayhelloworld ();
}

}

# Include <JNI. h>
# Include "jni_helloworld.h"
# Include <stdio. h>

Jniexport void jnicall
Java_jni_helloworld_displayhelloworld (jnienv * ENV, jobject OBJ)
{
Printf ("Hello world! \ N ");
Return;
}