It was the first such data structure to be invented. They allow fast lookup, addition and removal of items, and can be used to implement either dynamic sets of items, or lookup tables that allow finding an item by its key (e.g., finding the phone number of a person by name).ДЄVL Tree: In computer science, an AVL tree is a self-balancing binary search tree. The tree additionally satisfies the binary search tree property, which states that the key in each node must be greater than or equal to any key stored in the left sub- tree, and less than or equal to any key stored in the right sub-tree. Just as a list can be implemented with a linked list or an array, a priority queue can be implemented with a heap or a variety of other methods such as an unordered array.Д«inarySearchTree: A binary search tree is a rooted binary tree, whose internal nodes each store a key (and optionally, an associated value) and each have two distinguished sub-trees, commonly denoted left and right. Priority queues are often implemented with heaps, they are conceptually distinct from heaps. In a priority queue, an element with high priority is served before an element with low priority. PriorityQueue: In computer science, a priority queue is an abstract data type where each element has a 'priority' associated with it. In a FIFO data structure, the first element added to the queue will be the first one to be removed.

This makes the queue a First-In-First-Out (FIFO) data structure. Queue: In computer science, a queue is a particular kind of abstract data type or collection in which the entities in the collection are kept in order and the principle (or only) operations on the collection are the addition of entities to the rear terminal position, known as enqueue, and removal of entities from the front terminal position, known as dequeue. Additionally, a peek operation may give access to the top without modifying the stack. The order in which elements come off a stack gives rise to its alternative name, LIFO (last in, first out).

pop, which removes the most recently added element that was not yet removed.

push, which adds an element to the collection, and.

Stack: In computer science, a stack is an abstract data type that serves as a collection of elements, with two principal operations: Both Singly Linked List and Doubly Linked List can be made into a circular linked list.

It can be conceptualized as two singly linked lists formed from the same data items, but in opposite sequential orders.Д¬ircularLinkedList: Circular Linked List is a variation of Linked list in which the first element points to the last element and the last element points to the first element. The beginning and ending nodes' previous and next links, respectively, point to some kind of terminator, typically a sentinel node or null, to facilitate traversal of the list. Each node contains two fields, called links, that are references to the previous and to the next node in the sequence of nodes. This structure allows for efficient insertion or removal of elements from any position in the sequence during iteration.ДoublyLinkedList: In computer science, a doubly linked list is a linked data structure that consists of a set of sequentially linked records called nodes. Under the simplest form, each node is composed of data and a reference (in other words,a link) to the next node in the sequence. It is a data structure consisting of a group of nodes which together represent a sequence.

Each pointing to the next node by means of a pointer. LinkedList: In computer science, a linked list is a linear collection of data elements, in which linear order is not given by their physical placement in memory. Dynamic arrays overcome a limit of static arrays, which have a fixed capacity that needs to be specified at allocation. After creation, its length is fixed.ДЄrrayList: In computer science, a dynamic array, growable array, or array list is a random access, variable-size list data structure that allows elements to be added or removed.

The length of an array is established when the array is created. Implemented following Data Structures using Java Language :ДЄrrays: An array is a container object that holds a fixed number of values of a single type.

Linked list using array vs arraylist