Java please quick

Consider the following definitions for a circular reference-based linked list (i.e., singly-linked, not doubly linked): public class Node { public object item: public Node next: } public class List { private Node head: private int numNodes: .. } Implement the method enqueue for the class List to include in this class the functionality of a queue. Please consider: the first node of the list as the front of the queue, and the last node of the list as the rear of the queue. //Adds input item at the rear of the queue. public void enqueue(object o) { .. }