java - Is there a mistake in this illustration? -

in chapter 14.2, page 620, in "big java" (international 4th edition), cay horstmann, shown how implement linked list. add method of listiterator looks this:

public void add(object element) {             if(position == null) {                 addfirst(element);                 position = first;             } else {                 node newnode = new node();                 newnode.data = element;                 newnode.next = position.next;                 position.next = newnode;                 position = newnode;             }             previous = position; } 

the corresponding illustration looks 1 added below. first 1 before "newnode" has been added, , second 1 after. can tell me if there mistake in second picture. shouldn't fields "previous" , "position" point same object after call "add(object element)"? top picture before , bottom 1 after insertion.

the way see code seems wrong , previous should have been set position before changed.

something this:

public void add(object element) {             previous = position;             if(position == null) {                 addfirst(element);                 position = first;             } else {                 node newnode = new node();                 newnode.data = element;                 newnode.next = position.next;                 position.next = newnode;                 position = newnode;             } } 

that match intended outcome of second picture