class Greeting {

	public static native String sayHello(String name);

	static
	{
		System.loadLibrary("Greeting");
	}
}

javac Greeting.java
javah Greeting

#include "Greeting.h"
#include 
#include 

JNIEXPORT jstring JNICALL Java_Greeting_sayHello (JNIEnv *env, jclass cl, jstring name)
{
	jstring jstr;
	char greeting[] = "Hello, ";

	char* cname;
	cname = (*env)->GetStringUTFChars(env, name, NULL);

	strcat(greeting,cname);

	jstr = (*env)->NewStringUTF(env, greeting);

	return jstr;
}

//on Cygwin programming environment in windows
gcc -mno-cygwin -D __int64="long long" -I JAVA_HOME/include/ -I JAVA_HOME/include/win32 -shared -Wl,--add-stdcall-alias -o Greeting.dll Greeting.c

// Gnu C compiler on Linux
gcc -fPIC -I JAVA_HOME/include -I JAVA_HOME/include/linux -shared -o libGreeting.so Greeting.c


//With tSun compiler under the Solaris Operating System
cc -G -I JAVA_HOME/include -I JAVA_HOME/include/solaris -o libGreeting.so Greeting.c

//in Microsoft C++ compiler on Windows
cl -I JAVA_HOME\include -I JAVA_HOME\include\win32 -LD Greeting.c -FeGreeting.dll

class GreetingTest
 {
    public static void main(String[] args)
    {
	   System.out.println(Greeting.sayHello("Rukshan"));
    }
 }

javac GreetingTest.java
java GreetingTest