I got it answer here:
JNIEXPORT void JNICALL Java_JavaArrayTest
(JNIEnv *env, jobject, jdoubleArray x, jdoubleArray y)
{
long N = env->GetArrayLength(x); // Access the array length
double* xPtr = env->GetDoubleArrayElements(x,0); // Get C++ pointer to array data
double* yPtr = env->GetDoubleArrayElements(y,0); // and "pin" array elements
- - - - - -
}
Where O/1 defined as :
#define JNI_FALSE 0
#define JNI_TRUE 1