Java Intrinsic interface Jni (Java Native Interface) HelloWorld

1. Writing Java programs

public class HelloWorld {public    native void Displayhelloworld ();//All native keywords are decorated with local declarations    static {        System.loadlibrary ("Hello");//load local library    } public    static void Main (string[] args) {        new HelloWorld (). Displayhelloworld ();    }}

2. Compiling

Javac Helloworld.java

3. Generate a header file with the extension h

Javah HelloWorld

4. Write a method with the same method name declared in the local method implementation and the header file generated by the Javah command.

#include "jni.h" #include "HelloWorld.h"//#includeotherheaders Jniexport void Jnicalljava_helloworld_ Displayhelloworld (Jnienv*env,jobject obj) {printf ("helloworld!\n"); return;}

5. Write Pro file

TARGET = Hellotemplate = Liblanguage = c++config-= qtconfig + Warn_off dllincludepath     + = $$ (java_home) \include$$ (JAV A_home) \include\win32headers = Helloworld.hsources = helloworldimpl.c

6. Compiling dynamic link library

Qmakenmake

7. Running the program

Java HelloWorld

Can be output from the console.

Java Intrinsic interface Jni (Java Native Interface) HelloWorld