Integer vs int: with regard to memory

Question

I was wondering if there is a difference in the memory occupied by Integer n, and int n.

I know int n occupies 4 bytes normal

Answer 1

An Integer object in Java occupies 16 bytes.

I don't know whether running a 64- vs 32-bit JVM makes a difference. For primitive types, it does not matter. But I can not say for certain how the memory footprint of an object changes (if at all) under a 64-bit system.

You can test this for yourself here:

Java Tip 130: Do you know your data size?