Calling C library using JNA ( Direct Mapping )

Here, I am using JNA with Direct Mapping which can improve the performance. A small change is necessary to do this than described in my previous post. This will include only java portion. For other portion, refer to the previous post.

Sample java code: 

File: HelloDirectWorld.java

import com.sun.jna.Library;
import com.sun.jna.Native;

public class HelloDirectWorld {
    public static native void printHello();
    static {
Native.register("useC");
    }

    static public void main(String argv[]) {
        printHello();
    }
}

Command used to compile HelloDirectWorld.java:

javac -classpath .:jna-3.2.3.jar HelloDirectWorld.java 

Command to run our java program:

java -classpath .:jna-3.2.3.jar HelloDirectWorld

The output will be:

Hello Blog World

Enjoy using JNA.