Question

I need help creating these methods for a java DoublyLinkedList class that implements List

public E get(int index) {

public E set(int index, E element) {

public void add(int index, E element) {

public E remove(int index) {

public int indexOf(Object o) {

public int lastIndexOf(Object o) {

public List subList(int fromIndex, int toIndex){

Answer 1

The question involves creating methods for a Java DoublyLinkedList class that manage elements within the list. These methods include get, set, add, remove, indexOf, lastIndexOf, and subList, and each serves a specific function in list manipulation.

Step-by-step explanation:

The student is asking for help in implementing methods for a Java DoublyLinkedList class. These methods are typical for a list data structure and include get, set, add, remove, indexOf, lastIndexOf, and subList. For each of these methods, specific functionalities are to be implemented to manipulate the elements within a doubly linked list.

The methods must handle edge cases such as invalid indexes and must update the list and its connections appropriately.

For example:

• The get method retrieves an element at a specific index.
• The set method changes the element at a specified index and returns the element that was replaced.
• The add method inserts a new element at a particular index and shifts subsequent elements if necessary.
• The remove method removes the element at a given index and returns it, while adjusting the previous and next pointers of the surrounding nodes.
• The indexOf and lastIndexOf methods find the first and last occurrence of a given object in the list, respectively.
• The subList method creates a new sublist from a range within the list.

Implementations of these methods must consider the efficiency of traversing a doubly linked list. Given that it can be traversed in both directions, it is possible to optimize the search operations by starting from the head or the tail depending on the index.