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JNIÊÇJava Native InterfaceµÄËõд£¬Í¨¹ýʹÓÃnative·½·¨£¬Java¿ÉÒÔµ÷Óñ¾µØC/C++×Ó³ÌÐò¡£ÉùÃ÷Ò»¸ö±¾µØ×Ó³ÌÐòµÄ·½·¨ÊÇ£ºÔÚ·½·¨ÃûǰÌí¼ÓnativeÐÞÊΣ¬Èç
public native void myfun();
µ÷ÓøÃ×Ó³ÌÐòµÄ·½·¨Îª£º
static{
    System.loadLibrary("myfun");
}
ÔÚWindowsÉÏ£¬ÉÏÃæµÄmyfun¼´Ö¸°üº¬ÓÃC/C++дµÄmyfun()µÄʵÌåµÄDLL——myfun.dll¡£ÏÂÃæÒÔNativeDemo³ÌÐòΪÀýÀ´ËµÃ÷ÔõÑùÔÚWindowsÏ£¨XP+VS2008+JDK1.6u17£©Ê¹ÓÃJNI¡£
1. ±àдԴ³ÌÐòNativeDemo.java
NativeDemo.javaÖÐÉùÃ÷ÁËÒ»¸ö±¾µØ×Ó³ÌÐòtest()£º
public native void test();
¸Ã×Ó³ÌÐò´ÓÖ÷³ÌÐò»ñµÃint±äÁ¿iµÄÖµ£¬¶ÔÆä¼Ó±¶£¬È»ºó·µ»Ø¸øÖ÷³ÌÐò¡£¾ßÌå´úÂëÈçÏ£º
// Using Native method
public class NativeDemo{
    int i;
    public static void main(String args[]){
        NativeDemo ob=new NativeDemo();
        ob.i=10;
        System.out.println("This is ob.i before the native method: "+ob.i);
        ob.test(); //call a native method
        System.out.println("This is ob.i after the Native method: "+ob.i);
        ob.test(); //call a native method
       System.out.println("This is ob.i after the Native method: "+ob.i);
    }
    // declare native method
    public native void test();
    static{
         // load DLL that contains static method
         System.loadLibrary("NativeDemo");
    }
}
2. ±àÒëNativeDemo.java
javac NativeDemo.java
µÃµ½NativeDemo.class
3. ʹÓÃjavah.exeÉú³ÉNativeDemo.h
javah -jni NativeDemo
javah.exeÔÚ%JAVA_HOME%\binÏ£¬Éú³ÉµÄNativeDemo.hÈçÏ£º
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class NativeDemo */
#ifndef _I


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