Complete the method sortByState() and sortByWhom2vote()

package Apps;        import ADTs.ListADT;    import Algorithms.Search;    import Algorithms.Sort;    import DataStructures.SinglyLinkedList;    import java.util.ArrayList;    import java.util.Arrays;    import java.util.Collection;    import java.util.Collections;    import java.util.Comparator;        /**     * Vote management     * @author ITSC 2214 Q     *      */    public class VoteMan {         private ListADT votes;                public VoteMan() {            readVotes();        }            // private helper method to initialize data        private void readVotes() {                        votes = new SinglyLinkedList();            //(String name, String state, int ID, String who2Vote)            votes.addFirst(new Vote("Jason Aldean", "NC", 1, "Peter Pan"));            votes.addFirst(new Vote("Panic at the Disco", "NC", 2, "Harry Potter"));            votes.addFirst(new Vote("Phish", "FL", 1, "Harry Potter"));            votes.addFirst(new Vote("Carrie Underwood", "NC", 3, "Peter Pan"));            votes.addFirst(new Vote("Bonnie Raitt", "SC", 1, "Peter Pan"));            votes.addFirst(new Vote("Needtobreathe", "FL", 2, "Harry Potter"));            votes.addFirst(new Vote("Dolly Parton", "SC", 2, "Harry Potter"));            votes.addFirst(new Vote("Trans-Siberian Orchestra", "FL", 3, "Harry Potter"));            votes.addFirst(new Vote("Twney One Pilots", "NC", 4, "Harry Potter"));        }            /**         * Examine whether the given vote information can be found         */        public void existVote(String state, int ID, String whom2vote) {            Vote target = new Vote("", state, ID, whom2vote);                int foundIndex = -1;            try {                foundIndex = Search.linearSearch(votes, target);            } catch (Exception ex) {                ex.getMessage();            }            if (foundIndex != -1) {                System.out.println("Linear Search. Found vote at the index ");                System.out.println("t" + foundIndex);            } else {                System.out.println("Linear Search. Didn't find vote");            }        }            /**         * Sorts the votes stored by this VoteMan by states,         * ascending.Doesn't print or return anything.          */        public void sortByState() {                         System.out.println("Selection sort by states: " + this.toString());            //TODO sort votes using selection sort based on voting states                            Sort.insertionSort(votes, Vote.Comparators.STATE);            System.out.println("Insertion sort by states: " + this.toString());                        Sort.mergeSort(votes, 0, votes.size() - 1, Vote.Comparators.STATE);            System.out.println("Merge sort by states: " + this.toString());        }                 /**         * Sorts the votes stored by this VoteMan by whom2vote         */        public void sortByWhom2vote() {                     System.out.println("Selection sort by whom2vote: " + this.toString());            //TODO sort votes using selection sort based on whom to vote                            Sort.insertionSort(votes, Vote.Comparators.WHOM2VOTE);            System.out.println("Insertion sort by whom2vote: " + this.toString());                        Sort.mergeSort(votes, 0, votes.size() - 1, Vote.Comparators.WHOM2VOTE);            System.out.println("Merge sort by whom2vote: " + this.toString());        }            /**         * Retrieve all vote information              */        @Override        public String toString() {            //return Arrays.toString(concertTickets);            String list = new String();            try {                for (int i = 0; i < votes.size(); i++) {                    list = list.concat("t" + votes.get(i).toString() + "" );                }            } catch (Exception ex){                ex.getMessage();            }            return list;        }                public static void main(String argv[]){            VoteMan voteman = new VoteMan();            voteman.sortByState();            voteman.sortByWhom2vote();            voteman.existVote("FL", 1, "Harry Potter");        }    }