Java JNI Question: Download Questions PDF
Define JNI functions and pointers?
Answer:
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.
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