Exploring Java Linked Lists

What is a linked list in Java?

• A linked list is a collection of variables that can only store integers.

• A linked list is a type of array that stores elements in contiguous memory locations.

• A linked list is a data structure that only allows access to the last element.

• A linked list is a data structure consisting of nodes, where each node contains data and a reference to the next node.

What are the main components of a singly linked list?

• Nodes and Tail pointer

• Data and Index pointer

• Elements and Head reference

• Nodes and Head pointer

How does a doubly linked list differ from a singly linked list?

• A doubly linked list allows traversal in both directions, while a singly linked list only allows traversal in one direction.

• A doubly linked list has fewer pointers than a singly linked list.

• A singly linked list can store more data than a doubly linked list.

• Traversal in a doubly linked list is limited to the last node only.

What is a circular linked list and how does it work?

• A circular linked list is a type of array that allows random access.

• A circular linked list has no nodes and cannot be traversed.

• A circular linked list is a linked list where the last node points to the first node, allowing continuous traversal.

• A circular linked list is a linear structure where nodes are connected in a straight line.

What are the advantages of using linked lists over arrays?

• Advantages of linked lists over arrays include dynamic size, efficient insertions/deletions, and better memory management.

• Slower access times for elements

• Fixed size allocation

• Higher memory overhead for small data sets

Describe the process of adding a node to the beginning of a singly linked list.

• Create a new list and copy all nodes to it.

• Create a new node, set its next to the current head, and update the head to the new node.

• Remove the current head and set it as the new node.

• Add the new node at the end of the list.

How do you remove a node from a doubly linked list?

• Delete the last node without updating pointers.

• Replace the node with a new one without adjusting links.

• Remove the head node only.

• Update pointers of adjacent nodes and delete the target node.

What is the time complexity of accessing an element in a linked list?

• O(n^2)

• O(n)

• O(1)

• O(log n)

Explain how to traverse a circular linked list.

• Start at the tail and move backwards through nodes.

• Visit each node only once and stop at the last node.

• Traverse only the first half of the list.

• Start at the head, loop through nodes until you reach the head again.

What methods are commonly used to implement a linked list in Java?

• Common methods include using a custom Node class and a LinkedList class, or utilizing Java's built-in LinkedList class.

• Using an ArrayList class

• Implementing a Stack class

• Utilizing a HashMap class