I need to replace the question mark with the right value. I chose size() becuase then it will traverse the entire list without throwing the exception.

I also need to make a diagram for this linked list and I am confused about the

Node current = head;

Node temp = head;

section. I'm pretty lost with this diagram but I am very lost as to where the head points to after this section because current will be head but then temp will also be head.