public interface ListIterator<AnyType>
       extends Iterator<AnyType> {
boolean hasPrevious();
AnyType previous();
void add( AnyType x );
void set( AnyType newVal );

ListIterator extends the functionality of Iterator:

• It is possible to move backwards through the list as well as forwards.

• add adds an element at the current position: O(1) for LinkedList but O(n) for random positions in ArrayList.

• set sets the value of the last item seen: O(1) for both.

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