In this assignment you are required to extend the linkedlist. java file to include the methods: addlist, subtractlist, and reverselist:

1. addlist:

this method is supposed to take another linked list as a parameter, and add the contents of this linked list to the calling instance's linked list. adding the elements should only be done if the element does not already exist. all elements to be added should be added at the end of the linked list.

2. subtractlist:

this method does the opposite of addlist. it is to take another linked list as a parameter and remove the contents of this linked list from the calling instance's linked list. elements are only removed if they exist.

3. reverselist()

no parameters passed, but it should reverse the contents of the list.

what to do and what to submit?