JavaNativeCodes

This repository offers sample builds supporting native code through the Java Native Interface (JNI).

Getting Started

1. Create run directory using the mkdir command as directory name /sample

   $ mkdir sample
   $ cd sample
   

2. Write a Java Class CalculateMath.java that uses C Codes

   $ touch CalculateMath.java
   

3. You should use javac -h to compile the Java program and generate C/C++ header file called CalculateMath.h as follows:(In the parent directory)

   $ javac -h . sample/CalculateMath.java
   

4. Create and implementing the C Program CalculateMath.c

   $ touch CalculateMath.c
   

5. Compile the C program CalculateMath.c

   $ gcc -fPIC -I"$JAVA_HOME/include" -I"$JAVA_HOME/include/linux" -shared -o libmathlib.so CalculateMath.c
   

6. Native library can be loaded by loadLibrary with a valid name and run java program.

   $ static {
         System.loadLibrary("mathlib"); // will load libmathlib.so
   }