In one word, the difference between Stack and Queue comes in how they consume elements, In Stack, we remove the most recently added element, while in Queue we remove least recently added element.īefore seeing some more differences between Stack and Queue data structure, let's see some similarity between them, this will help to understand their differences better.ġ) Both Stack and Queue are built on top of basic data structures like an array or linked list. In this article, we will compare Stack vs Queue based upon their differences in behavior and how they are implemented and used in Java programming language. Java supports both these data structures and provides a sample implementation of them, by the way, you should also be familiar with implementing Stack and Queue in Java using an array and linked list, which is another good code-related question in a programming job interview. When the difference between Stack and Queue is asked in Java Interviews, the interviewer also expects you to be familiar with the Stack and Queue classes from Java Collection Framework. object which is first inserted, is first consumed, because insertion and consumption happen at the opposite end of the queue. On the other hand Queue data structure literally represent a queue, which is a FIFO (First In First Out) data structure, i.e. Well, the main difference comes the way these data structures are used, Stack is LIFO (Last In First Out) data structure, which means the item which is inserted last is retrieved first, similar to a stack of plates in a dinner party, where every guest pick up the plate from the top of the stack. The difference between Stack and Queue Data structure is also one of the common questions not only in Java interviews but also in C, C++, and other programming job interviews. You can use Stack to solve recursive problems and Queue can be used for ordered processing. As opposed to the array and linked list, which are considered primary data structures, they are secondary data structures that can build using an array or linked list. If it is not empty, we simply add the new node to the rear.Stack and Queue are two of the important data structures in the programming world and have a variety of usage. If the queue is empty, we points both front and rear to the new node. The enqueue operation is to add an element at the rear. The length is to track the length of the list. The front is a pointer to the first node. It has three class variables: front, rear and length. This class has variables of data and next. Using linked list, first we need to define a queue node. Part 3 – Circular queue as circular linked list Part 2 – Circular queue implementation with array Part 1 – Queue implementation with linked list Deque is a queue that can be enqueue and dequeue at both end. However array can be efficient to implement circular queue. Array is not recommended because it wastes a lot of space if there are many adds and removes. Linked list is preferred because it is flexible to add and remove elements. In this post, linked list is used to implement queue. Both enqueue and dequeue operation have O(1) complexity. New elements are inserted at rear (enqueue), and existing elements are removed from the front (dequeue). A queue is First-In-First-Out (FIFO) data structure. Queue implementation is using underlying data structures (linked list, array) to implement enqueue and dequeue.
0 Comments
Leave a Reply. |