What is the Collections API?
The Collections API is a set of classes and interfaces that support operations on collections of objects.
What is HashMap and Map?
Map is Interface and Hashmap is class that implements this interface.
What is the difference b/w Iterator and ListIterator?
Iterator : Enables you to cycle through a collection in the forward direction only, for obtaining or removing elements
ListIterator : It extends Iterator, allow bidirectional traversal of list and the modification of elements
What is the List interface?
The List interface provides support for ordered collections of objects.
What is an Iterator interface?
The Iterator interface is used to step through the elements of a Collection.
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