Question

This is the usual way for declare a Java array:

int[] arr = new int[100];

But this array is using heap space. Is there a way we can declare an array using stack space like c++?

Answer 1

In a word, no.

The only variables that are stored on the stack are primitives and object references. In your example, the arr reference is stored on the stack, but it references data that is on the heap.

If you’re asking this question coming from C++ because you want to be sure your memory is cleaned up, read about garbage collection. In short, Java automatically takes care of cleaning up memory in the heap as well as memory on the stack.