java programming, need to do the set,get,add,and remove methods

and this is the factory class

import java. util. AbstractList Fourque: an implementation of the List interface * that allows for fast modifications at the FOUR places * in the list: front, 1/3 in, 2/3 in and the back * Modify the methods so that *set/get have constant runtime k -add/remove have runtime * + minl i, sizeO-i, size/3-il, 12sizeO/3-il) * Oparam the type of objects stored in this list ks/ public class Fourque k The class of elements stored in this queue ks/ protected Factory(f; protected int n public Fourque (Class