What is a Stack?
Explore the fundamentals of stack data structures, including their last-in-first-out (LIFO) behavior and primary methods such as push and pop. Understand how stacks enable backtracking, recursive processing, and algorithmic implementations, preparing you for coding interviews with Java-centric examples.
We'll cover the following...
Introduction #
We are all familiar with the famous Undo option, which is present in almost every application. Have you ever wondered how it works? The idea is that you store the previous states of your work (which are limited to a specific number), in the memory in such an order that the last one appears first. This can’t be done just by using arrays, which is why the Stack comes in handy.
You can think of the Stack as a container, in which we can add items and remove them. Only the top of this container is open, so the item we put in first will be taken out last, and the items ...