Introduction to Stack and Queue data Structures in detail and their differences.Stack and Queue both are Linear Data Structures. They are used to store the same type of data and retrieve the data in a specific order. A Queue offers services in operations research, transportation and computer science that involves persons, data, events and objects to be stored for later processing.Ĭomment below if you found anything incorrect or have doubts related to above difference between stack and queue tutorial.Stack and Queue are fundamental data structures in Java Collections Framework. Used in infix to postfix conversion, scheduling algorithms, depth first search and evaluation of an expression. A Queue can be divided into sub sections and it has the following extensions: Double Ended Queue, Simple Queue, Priority Queue and Circle Queue. REAR = MAX – 1 A Stack cannot be divided into sub sections and it doesn’t have extensions. TOP = MAX – 1 To check if a queue is full, following condition is used: To check if a stack is full, following condition is used: A Queue data structure is an ordered collection of data. A Stack data structure is not necessarily an ordered collection of data items. The insertion operation occurs at REAR end and the deletion operation occurs at FRONT end. TOP = -1 To check if a queue is empty, following condition is used:įRONT = -1 || FRONT = REAR + 1 The insertion and deletion operations occur at the TOP end of a Stack. To check if a stack is empty, following condition is used: The element to be inserted first is removed first. The element to be inserted first is removed last. The data items in a queue are inserted and deleted from different ends. The data items are inserted and deleted from the same end. A Queue contains REAR and FRONT as its reference for data processing. A Stack contains TOP as its reference for data processing. A Queue is a horizontal representation of data items. A Stack is primarily a vertical representation of data items. A Stack requires only one reference pointer. A Queue Data Structure works on First In First Out (FIFO) principle. Image Source Difference Between Stack and Queue Stack Queue A Stack Data Structure works on Last In First Out (LIFO) principle. The condition to check if a queue is empty: A Queue can be divided into sub sections and it has the following extensions: Double Ended Queue, Simple Queue, Priority Queue and Circle Queue.Ī Queue offers services in operations research, transportation and computer science that involves persons, data, events and objects to be stored for later processing. A Queue contains ordered collection of data items. The insertion operation is done at rear end whereas the deletion occurs at the front end. ![]() The element to be inserted first is the first element to get deleted. In a Queue, the data items can be inserted and deleted from different ends. The Queue data structure contains FRONT and REAR as its reference points for data processing.Ī Queue can also be represented in by static arrays as well as linked lists. Queue is normally represented as a horizontal representation of data items. A Queue requires two reference variables. A Queue data structure works on First In First Out principle, also abbreviated as FIFO.
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