Chapter 24.2, Problem 24.2.1CP

Program Plan Intro

Iterator:

Iterators are brought in use only in Collection framework in java so as to retrieve elements one by one. There are three types of iterators, they are:

• Enumeration
• Iterator
• Listiterator

Enumeration:

It is an interface that is used to get elements of legacy collections(Vector, Hashtable). It is also used to specify the input streams to a “SequenceInputStream”.

Iterator:

It is also known as universal iterator as we can use it to any Collection object. With the use of this iterator, we can perform both read and remove operations.

Listiterator:

It is only applicable for list collection implemented classes like ArrayList, LinkedList and soon. it also provides bi-directional iteration.