The ArrayList might also need to be resized to accommodate the new element. ![]() This is because the elements in the ArrayList needs to be shifted if a new element is added in the middle of the ArrayList. But it takes O(n) time to access an element in a LinkedList because it needs to traverse to the desired element by following the next/prev references.Īdding or removing elements are usually slower in an ArrayList compared to LinkedList. You can access an element in an ArrayList in O(1) time. A pointer/reference to the previous node in the list.įollowing is a visual of ArrayList and LinkedList data structures:įollowing are some key differences between LinkedList and ArrayList:Ī LinkedList consumes more memory than an ArrayList because it also stores the next and previous references along with the data. ![]() A pointer/reference to the next node in the list.However, a LinkedList uses a doubly-linked list to store its elements.Ī doubly-linked list consists of a collection of nodes, where each node contains three fields. However, they differ completely in the way they store and link to the elements.Īn ArrayList stores the elements sequentially based on their index. You must explicitly synchronize concurrent modifications to the LinkedList in a multi-threaded environment.īoth ArrayList and LinkedList implement the List interface. Therefore, It can also be used as a Queue, Deque or Stack. The LinkedList class implements Queue and Deque interfaces. LinkedList can have duplicate and null values. ![]() Java LinkedList maintains the insertion order of the elements. Here is the class hierarchy of LinkedList -įollowing are some key points to note about LinkedList in Java. It is part of Java’s collections framework. Java LinkedList is a doubly linked list implementation of Java’s List and Deque interfaces. Java LinkedList Tutorial with Examples Rajeev Singh Java Ap2 mins read
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