JNI Tutorial

HelloWorld.c

#include <jni.h>
#include "HelloWorld.h"
#include <stdio.h>

JNIEXPORT void JNICALL Java_HelloWorld_sayHello (JNIEnv *env, jobject obj) {
    printf("Hello,the World!!!\n");
}

HelloWorld.h

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class HelloWorld */

#ifndef _Included_HelloWorld
#define _Included_HelloWorld
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     HelloWorld
 * Method:    sayHello
 * Signature: ()V
 */
JNIEXPORT void JNICALL Java_HelloWorld_sayHello
  (JNIEnv *, jobject);

#ifdef __cplusplus
}
#endif
#endif

HelloWorld.java

class HelloWorld {
    public native void sayHello();
    static {
        System.loadLibrary("HelloWorld");
    }
    public static void main(String[] args) {
        (new HelloWorld()).sayHello();
    }
}