Similar to also contains a nested static class Node, which represents a node in the linked list. For this example, I have created our own singly linked list class. Since using existing Java classes is now allowed on Programming Job interviews, you need to create your own to write code. Implementing Your Own Linked List on Interviews Since we cannot use the class to demonstrate this example, as it is a doubly-linked list and also in most of the time on coding interviews, the Interviewer will not allow you to use existing Java classes or API.Īnyway, in a doubly-linked list, you can traverse in both directions like both forward and backward as each node contains the reference to both the previous and next node.ītw, if you are not familiar with the linked list data structure, it's better to first go through a good data structure and algorithm course like Data Structures and Algorithms: Deep Dive Using Java to learn more about linked lists data structure. In order to reverse the linked list, you need to iterate through the list, and at each step, we need to reverse the link like after the first iteration head will point to null and the next element will point to the head.Īt the end of traversal when you reach the tail of the linked list, the tail will point to the second last element and it will become a new head because you can now traverse through all elements from this node. Each node in the linked list contains two things, data and a pointer to the next node in the list. A singly linked list, also known as just linked list is a collection of nodes that can only be traversed in one direction like in the forward direction from head to tail. In the last article, I have shown you how to use recursion to reverse a linked list, and today, I'll show you how to reverse a singly linked list in Java without recursion. Hello guys, reverse a linked list is a common coding problem from Programming Job interviews and I am sure you have seen this in your career, if you are not, maybe you are a fresher and you will going to find about this very soon in your next technical interview.
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