Given the following definition of a single linked list, write a method that calculates and returns the sum of even integers in a linked list. public class SLL { private static class Node{ private E...

Given the following definition of a single linked list, write a method that calculates and returns the sum of even integers in a linked list.

public class SLL {

private static class Node{

        private E data;

        private Node next;

        private Node(E dataItem) {

            data = dataItem;

            next = null;

        }

        private Node(E dataItem, Node nodeRef) {

            data = dataItem;

            next = nodeRef;

        }

          }

          private Node head = null;

           private int size = 0;

}