Exercise 2: Implement a method replace for the ADT bag that replaces and return any object currently in a bag with a given object. Exercise 11: Suppose that the bag contains Comparable objects, as described in the previous exercise. Define a method for the class ArrayBag that returned a new bag of items that are lead than some given item. The header of the following method could be as following: Public BagInterface getAllLess Than(Comparable an Object)