What is the main difference between primitive type and wrapper class?
java, object, primitive-types, wrapper
Solution
None.
That's the exact same thing. In the first case you just have a supplementary variable.
Note that with autoboxing you rarely need to have both an `int` and an `Integer` variables. So for most cases this would be enough :
int pInt = 500;
The main case where the Integer would be useful is to distinguish the case where the variable is not known (ie `null`) :
Integer i = null; // possible
int i = null; // not possible because only Object variables can be null
But don't keep two variables, one is enough.
Problem
What is the difference between these two lines? ``` int pInt = 500; ``` and ``` Integer wInt = new Integer(pInt); ``` Or ``` Integer wInt = new Integer(500); ```