学步园

Father.java代码

package com.easou.abo.jnitest;

public class Father {
	public void function(){
		System.out.println("Father::function");
	}
}

Child.java代码

package com.easou.abo.jnitest;

public class Child extends Father {
	public void function(){
		System.out.println("Child::function");
	}
}

Demo.java代码

package com.easou.abo.jnitest;

public class Demo {
	public int number = 10;
	public native void test();
	public Father p = new Child();
	public static void main(String[] args) {
		System.loadLibrary("testJni");
		Demo dm = new Demo();
		dm.test();
	}

}

C代码

#include "com_easou_abo_jnitest_Demo.h"
#include <stdio.h>
#include<iostream>
using namespace std;
JNIEXPORT void JNICALL

Java_com_easou_abo_jnitest_Demo_test(JNIEnv * env, jobject obj){
	jclass hello_clazz = env->GetObjectClass(obj);//获得java中的类
	jfieldID id_p = env->GetFieldID(hello_clazz,"p","Lcom/easou/abo/jnitest/Father;");
	jobject p = env->GetObjectField(obj,id_p);

	jclass clazz_Father = env->FindClass("com/easou/abo/jnitest/Father");
	jmethodID id_Father_function = env->GetMethodID(clazz_Father,"function","()V");
	env->CallVoidMethod(p,id_Father_function);//子类
	env->CallNonvirtualVoidMethod(p,clazz_Father,id_Father_function);//父类
}

控制台输出

Child::function
Father::function