How to check if an element in array exists in Java

Question

If I have an int array structured like this:

private int[][] map = new int[400][400];

And I try to retrieve

map[100][200]

And that element isn't initialized, will i get a compiler/runtime error or will it return null? And is there any function to check if a given element/index exists/has been set?

Answer 1

As your array declaration is of a primitive type you won't get any compiler or runtime errors - the default value of 0 will be returned.

If your array had been an array of Objects, then the array would hold null for any element not specifically assigned.