Introduction to Collection framework

Recording of session on introduction to collection framework
covers:
- the interface hierarchy in the Collection framework
- the Iterator and the Iterable interfaces
- availability of for-each loop for Iterable types
- abstract methods of the Colllection inteface
- collection methods covered are:
-- add, remove, contains, size, isEmpty, clear
-- toArray, iterator
-- addAll, removeAll, retainAll, containsAll