having trouble with passing null values into returnobjectimpl constructors
wasnt working because constructor method in returnobjectimpl was a method returning void. i forgot that constructor methods should not return anything, not even void
I think my returnObjectImpl is fully correct now. Arraylist.add method is also complete. the specification says to return an empty returnobject if the operation was successful. in my method i return a returnobject with a value set to null.not sure if this is what the specification means when referring to empty
completed method for adding element into arraylist at particular index
completed method for adding element into arraylist at particular index