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!!! Java Frequently Asked Questions !!!

Q.Difference between ArrayList and LinkedList?

SCJP 1.5/1.6 Exam Kit

!!!Answer!!!- From Technical Expert

ArrayList is good for adding and removing elements from the end of the container. All of these operations can be performed in constant time -- O(1).
adding and removing elements from any other position proves more expensive -- linear to be exact: O(n-i), where n is the number of elements and i is the index of the element added or removed.
For Example : ArrayList Has 5 elements and you want to add an element on 2nd position.
Then arrayList add the element on 2nd position and shifted existing 2nd position element to 3rd , 3rd position element to 4th etc..

LinkedList can add or remove an element at any position in constant time -- O(1). Indexing an element is a bit slower -- O(i) where i is the index of the element in case of LinkedList.

Traversing an ArrayList is also easier since you can simply use an index instead of having to create an iterator.
The LinkedList creates an internal object for each element inserted. So you have to be aware of the extra garbage being created.

An ArrayList is a List implementation backed by a Java array.
With a LinkedList, the List implementation is backed by a doubly linked list data structure

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Answered By : Rupesh Raghani Replied Date : Dec 28 2011
Answer : ArrayList and LinkList both implements List interface, but Array list is good for adding and removing elements from end only where other elements of list does not affect its position, whereas link list is implemented as a doubly linked list in java, where it stores addresses of its next element and previous element also. So adding or removing any element in between requires only changes in the reference of previous and next node of the current node, which gives faster execution.
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Answer : what are main deffrence between arraylist and linkedlist ni algorithm
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