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Javin Paul

Posts: 1090
Nickname: javinpaul
Registered: Jan, 2012

Javin Paul is Java Programmer working on Finance domain.
Java - Iterator Example and Tutorial Posted: Feb 27, 2013 6:41 AM
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Java Iterator is used to iterate over Collections in Java. By Iteration, I mean, going over each element stored in collection and optionally performing some operation e.g. printing value of element, updating object or removing object from Collection. Iterator was not part of first Java release, and a similar class Enumeration was there to provide Iteration functionality. Iterator in Java was introduced form JDK 1.4 and it provides alternative to Enumeration, which is obsolete now days. Iterator is different to Enumeration in two main ways, first, Iterator allows programmer to remove elements from Collection during iteration. Second, names are shortened and improved in Iterator, by the way, you can see difference between Iterator and Enumeration for more differences. It's one of the frequently asked Java Interview question. Iterator is an interface and enhanced to support Generic from Java 1.5 release. Almost all popular collection implements Iterator, including ArrayList, LinkedList and HashSet. hasNext() method of Iterator is used as condition while Iterating, and next() method actually returns object, next in sequence maintained by Collection itself. In this Java programming tutorial, we will learn How to use Iterator in Java by coding Iterator example and iterating over ArrayList.

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