Stack In Data Structures | Data Structures and Algorithm | Data Structures in Urdu/Hindi
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What is a stack?
A stack is a data structure of ordered items where items can be inserted and removed only at one end. It follows the Last-In/First-Out (LIFO) principle and is sometimes referred to as a pushdown store.
Applications of stacks:
1. Program execution
2. Parsing
3. Evaluating postfix expressions
Operations on a stack:
push: Place an item on the stack
peek/top: Look at the item on top of the stack without removing it
pop: Look at the item on top of the stack and remove it
Implementing a Stack:
A stack can be implemented using either an array or a linked list.
Using an array:
The bottom of the stack is at index 0
The top of the stack is at index numItems-1
push onto the stack at index numItems
pop off of the stack at index numItems-1
Using a linked list:
Store the items in the stack in a linked list
The top of the stack is the head node, and the bottom of the stack is the end of the list
push by adding to the front of the list
pop by removing from the front of the list
Example Problem:
What happens if we try to pop an item off the stack when the stack is empty?
This is called a stack underflow, and in Java, we use the java.util.EmptyStackException to handle it.
To create a stack in Java, import the java.util.stack package and use the Stack() constructor.
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