#STACK VS QUEUE FULL#

Whereas, in the case of ArrayStack we set the element at topIndex to be null and decrement the topIndex value which is also performed in O(1) time. Removing the node of LinkedList and decrementing the topIndex is done in O(1) time complexity. Incrementing topIndex variable is also O(1). Time complexity for the addition of elements in array at a particular index is O(1) as well as for creating a node and attaching it to a LinkedList is also O(1). Public static final int CAPACITY = 1000 // default array capacity private int topIndex // index of the top element in stack private E data // generic array used for storage public ArrayStack () Identically, the pop() method also throws EmptyStackException if the stack is empty or removes the top element, returns its value, and decreases topIndex by 1. If the stack is empty it throws EmptyStackException. The peek() method returns the topmost element in the stack i.e data.

#STACK VS QUEUE FULL#

If it is full it throws an Exception else it simply adds an element to the stack and increment the topIndex by 1.

The push() method first checks if the stack is full. The empty() method checks if the topIndex is at -1 which implies, the stack is empty. The size() method returns the size of the stack i.e. We initialize the data array and topIndex in the constructor method. Default Array capacity is 1000 for the stack where capacity is not mentioned. There are two constructor methods one with capacity customed by the user and the other default. We declare an array named data to store the values and topIndex to keep track of the top element. We can make a stack of String datatype, of Integer datatype, or Character datatype. It enables the user to use any data type. We name our class as ArrayStack as we are using Array to store our data.Д® in Angular brackets () makes our class Generic. It will have the same functionality as we saw in the above examples.

We are implementing our own stack using class and methods. Implementation of Stack Using Array in Java You must have also observed the Back and Forward buttons on browsers.

When you make changes, it pushes changes onto the stack. When you undo something, it pops the most recent action. One such application is undo mechanism in text editors. No element can be retrived, removed, or added from the middle of the stack. In a like manner, elements can be added to the stack at the top and they can be seen or removed from the top. We cannot add or remove a plate at the middle of the stack. So, when we need a plate, we take (pop) from the top of the stack and when we want to add a plate we put (push) it at the top as well. The name вЂњstackвЂќ is derived from a stack of plates.

Implementation of Stack and Queue using Array as well as LinkedList.ДЄ stack is a collection of objects that are inserted and removed in a fashion.

Introduction to Stack and Queue data Structures in detail and their differences.

Insertion operation is known as enqueue and deletion operation is known as dequeue. The operations are denoted as push and pop for insertion and deletion respectively. Stack and Queue both are Linear Data Structures. They are used to store the same type of data and retrive the data in specific order. Stack and Queue are fundamental data structures in Java Collections Framework.

Stack vs queue