Example Code Ch 13-2
Assume that a linked list is implemented using the Node class where a Node contains instance data of int info; and Node next; where next references the next Node in the linked list. Also assume that head references the first Node in the list.
-Refer to Example Code Ch 13-2: Assume that the linked list has at least two Nodes in it. Which of the following instructions will return the second int value in the list?
A) return head.info;
B) return head.next.info;
C) return head.next.next.info;
D) return head.next.next.next.info;
E) It is not possible to return the second int value in the list using head.

Question

Quizplus · Accepted Answer

To return the second int value in the list, we need to access the info instance variable of the Node that is referenced by the next instance variable of the head Node. Therefore, we use head.next.info. Choice A will return the int value of the first Node in the list, choice C will return the int value of the third Node in the list, and choice D will give a null pointer exception since there is no fourth Node in the list.