In this post, we will learn the difference between LinkedList and ArrayDeque in Java. This is a frequently asked question in Java interviews for beginners. Let's dive into it.
LinkedList | ArrayDeque |
---|---|
LinkedList is implemented as a doubly linked list. | ArrayDeque is implemented as a resizable array. |
LinkedList allows null elements. | ArrayDeque does not allow null elements. |
LinkedList can perform all operations at both ends, but it is typically slower than ArrayDeque. | ArrayDeque is faster than LinkedList for enqueue (add) and dequeue (remove) operations at both ends. |
In LinkedList, every insertion or removal of an element requires a new Node object to be created or removed, increasing the time and memory overhead. | In ArrayDeque, elements are added and removed without creating or destroying any placeholder objects, reducing overhead. |
LinkedList uses more memory because it uses extra space for storing pointers to the next and previous elements. | ArrayDeque uses less memory because it only stores the elements in a contiguous array. |
LinkedList provides sequential access, i.e., to get to an element you have to traverse from the head node. This can take more time. | ArrayDeque provides faster access and removal of elements as compared to LinkedList. |
LinkedList in Java can also be used as a List with indices, allowing you to retrieve, add or remove elements from the middle of the list, although these operations are not as efficient. | ArrayDeque is primarily used as a Deque (Double ended queue) and lacks the ability to access elements using indices. |
In LinkedList, the 'size()' method is a constant-time operation. | In ArrayDeque, the 'size()' method is also a constant-time operation. |
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