Working with LinkedList [Java] - Online Course

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Solving LinkedList questions using two pointers

Updated on Sep, 2026

Programming, Software Engineering, Data Structures

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LinkedList is the easiest topic compared with all other DSA topics.

A class/node is created with two elements - data and address. The data field stores some values. The address field will store the address of the node to which it needs to connect.

When several nodes are connected with each other, it forms a Linked List.

The array has a size limitation. When we don't know the size of the elements we are going to have, we can't use Arrays. We can use Lists in those situations

Types of Linked Lists:

Simple Linked List – In this type of linked list, one can move or traverse the linked list in only one direction. where the next pointer of each node points to other nodes but the next pointer of the last node points to NULL. It is also called the “ Singly Linked List ”.

Doubly Linked List – In this type of linked list, one can move or traverse the linked list in both directions (Forward and Backward)

Circular Linked List – In this type of linked list, the last node of the linked list contains the link of the first/head node of the linked list in its next pointer.

Doubly Circular Linked List – A Doubly Circular linked list or a circular two-way linked list is a more complex type of linked list that contains a pointer to the next as well as the previous node in the sequence. The difference between the doubly linked and circular doubly list is the same as that between a singly linked list and a circular linked list. The circular doubly linked list does not contain null in the previous field of the first node.

The pointer approach is the most commonly used approach for all Linked list problems. In this course, we have solved many basic Leetcode questions related to the Linked list.

Basic OOP concepts like class, methods, etc

Check out the detailed breakdown of what’s inside the course

I am a Senior Software Engineer in PayPal. I enjoy coding, especially solving problems on Leetcode. I want to share what I know by creating a course, and I'm excited to present my course on Data Structures and Algorithms in Java. I've put a lot of effort into making my courses easy to understand, explaining concepts in the simplest way I can.

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