Stack in Java

Introduction to stack

A stack is an abstract data type or interface that extends the Collection interface in Java. It’s similar to the queue, though they differ in how they remove elements.

A stack uses the last in, first out (LIFO) method. This means when we perform deletion, the last element that was inserted is removed first. In a queue, the opposite happens. A queue works on the first in, first out (FIFO) algorithm.

This lesson will mainly concentrate on the Stack interface and its implementations.

Using the push() and pop() methods

Let’s start with some stack algorithms. The following program shows all the ...