Define TwoWayLinkedList to implements MyList.

Exercise 24.3: (pg no.  971)

(Implement a doubly linked list) The MyLinkedList class used in Listing 24.5 is

a one-way directional linked list that enables one-way traversal of the list. Modify

the Node class to add the new data field name previous to refer to the previous

node in the list, as follows:

public class Node<E> {

E element;

Node<E> next;

Node<E> previous;

public Node(E e) {

element = e;

}

}

Implement a new class named TwoWayLinkedList that uses a doubly linked list

to store elements. Define TwoWayLinkedList to implements MyList. You need

to implement all the methods defined in MyLinkedList as well as the methods

listIterator() and listIterator(int index). Both return an instance of

java.util.ListIterator<E> (see Figure 20.4). The former sets the cursor to

the head of the list and the latter to the element at the specified index.

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