When to use primitive and when reference types in Java

Question

In which case should you use primitive types(int) or reference types (Integer)?

This question sparked my curiosity.

Answer 1

One case in which Integer might be prefered is when you are working with a database where numerical entries are allowed to be null, since you wouldn't be able to represent a null value with an int.

But of course if you're doing straight math, then int would be better as others have mentioned due to intuitiveness and less overhead.