What's wrong with my code apart from main function

Question

import java.util.*;

public class Bowling {
HashMap<String, Integer> players;
Bowling() {
players = new HashMap<String, Integer>();
}
public void addPlayer(String name, int p) {
players.put(name, p);
}

public void getWinner(){

        HashMap<String, Integer> hm = new HashMap<String, Integer>();

        Map.Entry<String, Integer> entryWithMaxValue = null;

        for (Map.Entry<String, Integer> currentEntry : hm.entrySet()) {

            if (entryWithMaxValue == null || currentEntry.getValue().compareTo(entryWithMaxValue.getValue()) > 0) {

                entryWithMaxValue = currentEntry;

            }

               }

     System.out.println(entryWithMaxValue.getKey());

   } 

}

Answer 1

what's wrong?
it's incomplete ^^