Why do people still use primitive types in Java?

Question

Since Java 5, we\'ve had boxing/unboxing of primitive types so that int is wrapped to be java.lang.Integer, and so and and so forth.

I see

Answer 1

Primitive types are much faster:

int i;
i++;

Integer (all Numbers and also a String) is an immutable type: once created it can not be changed. If i was Integer, than i++ would create a new Integer object - much more expensive in terms of memory and processor.