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Java - ArrayList How to, Example and Tutorial

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Javin Paul

Posts: 412
Nickname: javinpaul
Registered: Jan, 2012

Javin Paul is Java Programmer working on Finance domain.
Java - ArrayList How to, Example and Tutorial Posted: Mar 1, 2013 9:24 AM
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ArrayList is one of the most popular Collection in Java. ArrayList is an implementation of List interface and provides ordered and index based way to store elements. Java ArrayList is analogous to array, which is also index based. In fact, ArrayList in Java is internally backed by array, which allows them to get constant time performance for retrieving elements by index. Since array is fixed length and you can not change there size, once created, Programmers, starts using ArrayList, when they need a dynamic way to store object, i.e. which can re-size itself. See difference between Array and List for more differences. Though, apart from ArrayList, there are other collection classes like Vector and LinkedList which implements List interface and provides similar functionalities, but they are slightly different. ArrayList is different to Vector in terms of synchronization and speed. Most of methods in Vector requires lock on Collection which makes them slow. By the way you can see difference between ArrayList and Vector more differences. Similarly, LinkedList also implements List interface but backed by linked list data structure rather than array, which means no direct access to element. When you use LinkedList, you need to traverse till element to get access of it. Apart from that, there are couple of more differences, which you can check on difference between ArrayList vs LinkedList post. In this Java programming tutorial, we will learn How to use ArrayList in Java i.e. adding, removing, accessing objects from ArrayList and  learning key details.
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