[Oracle interview]Why do we need wrapper classes?

It is  sometimes easier to deal with primitives as objects. Moreover most of the  collection classes store objects and not primitive data types. And also the  wrapper classes provide many utility methods also. Because of these resons we  need wrapper classes. And since we create instances of these classes we can  store them in any of the collection classes and pass them around as a  collection. Also we can pass them around as method parameters where a method  expects an object.