The java.util package has an interface called ListIterator that extends the Iterator interface and includes additional methods that are specific to iterating through the elements of lists forward or backward. Write a class called LinkedListIterator2 that adds some or all of these methods for iterating over a doubly linked list. The methods to add are the following (see the Java API Specification for descriptions of each method):

• public void add(E value)
• public boolean hasPrevious()
• public int nextIndex()
• public E previous()
• public int previousIndex()
• public void set(E value)