class Calculator {
                public static native int addition(int x,int y);

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

            javac HelloNative.java
            javah HelloNative
        

            #include "Calculator.h"
            #include <stdio.h>

            JNIEXPORT jint JNICALL Java_Calculator_addition (JNIEnv *env, jclass cl, jint x, jint y)
            {
                return x+y;
            }

        

            //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 Calculator.dll Calculator.c

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


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

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

        

            class CalculatorTest
             {
                public static void main(String[] args)
                {
                   int re=Calculator.addition(10,15);
                   System.out.println("re: "+re);
                }
             }

        

            javac CalculatorTest.java
            java CalculatorTest