Java JNI Interview Question:

Define JNI functions and pointers?

Submitted by: Administrator

JNI functions are those which are used by the developers to interact with JVM within a native method. Every JNI function receives a special parameter as its first argument - JNIEnv ; which points to a special JNI data structure of the type JNIEnv_ . One of the elements of JNI data structure is a ‘pointer to an array' generated by JVM, and each element of this array is again a pointer to a JNI function. A JNI function can be invoked from the native method by referencing these pointers. Every JVM provides a unique implementation of the JNI functions.
Submitted by: Administrator