null, in exceptional cases.įor example offer() return false, if it's not able to insert an element into Queue, while add() throws a RuntimeException when it fails to add an element into Queue. Collection method throws Exception, while Queue methods return special values e.g. Though Queue also supports add(Object o) and remove(Object o) operation, inherited from Collection, there is a difference between them. The key operation for Queue data structure in Java is offer() and poll(), which is used to add an object into Queue and retrieve an object from the head of Queue. So if you have a requirement where elements are processed in the order they are generated or put into Queue, you should use a Queue implementation, which supports FIFO ordering, but if you need to work with the most recently added entry, Stack would be the right data structure.Ģ) Key operation supported by any Stack implementation are push() and pop() which is used to add and retrieve an element from Stack, worth noting is that pop() not only retrieves element but also removes it from Stack. Now let's see differences between Stack and Queue data structure in Java:ġ) The first and major difference between Stack and Queue data structure is that Stack is LIFO(Last In First Out) data structure while Queue is FIFO (First In First out) data structure. BlockingQueue, LinkedList, and PriorityQueue.
It has a class called which represents Stack and then it has a Queue interface, with a couple of implementations e.g. Since both Stack and Queue can be bounded and unbounded, it makes sense to use an array for bounded stack and queue and may be linked list (it suits problem domain) for an unbounded queue.Ģ) The Java Collection API contains an implementation of both stack and queue data structure.
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. Stack and Queue are two of the important data structures in the programming world and have a variety of usage.
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