Почему не работает итератор

Question

Вот код:
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);
}
//введите код сюда
public String getWinner(){
Iterator<String> it = players.iterator();
String res;

return res;
}
}

public class Program {
public static void main(String[ ] args) {

Bowling game = new Bowling();
Scanner sc = new Scanner(System.in);

for(int i=0;i<3;i++) {
String input = sc.nextLine();
String[] values = input.split(" ");
String name = values[0];
int points = Integer.parseInt(values[1]);
game.addPlayer(name, points);
}

game.getWinner();
}
}

Answer 1

HashMap is not Collection, but Set is

var it = players.entrySet().iterator();

// where iterator is type: Iterator<Map.Entry<String, Integer>> it