High Five Scores

Given a list of Result objects which include the id and score of students. Each student will have at least five scores. Calculate the average score of the highest five scores of each student.

/*
Use hashmap to store each student's id and average score. Use priorityqueue to ensure the highest five scores of each student. 

time:O(n), space:O(n)
*/

import java.util.*;

class Result{
    int id;
    int value;
    public Result(int id, int value){
        this.id = id;
        this.value = value;
    }
}
public class Solution {
    public static Map<Integer, Double> getHighFive(Result[] results){
        if (results == null || results.length == 0) {
            return null;
        }
        Map<Integer, PriorityQueue<Integer>> map = new HashMap<>();
        for (Result result : results) {
            int id = result.id;
            int value = result.value;
            if (!map.containsKey(id)) {
                PriorityQueue<Integer> minheap = new PriorityQueue<>(6);
                minheap.add(value);
                map.put(id, minheap);
            } else {
                map.get(id).add(value);
                if (map.get(id).size() > 5) {
                    map.get(id).poll();
                }
            }
        }
        Map<Integer, Double> resultMap = new HashMap<>();
        for (Map.Entry<Integer, PriorityQueue<Integer>> entry : map.entrySet()) {
            PriorityQueue<Integer> pq = entry.getValue();
            double mark = 0;
            while (!pq.isEmpty()) {
                mark += pq.poll();
            }
            mark = mark / 5.0;
            resultMap.put(entry.getKey(), mark);
        }
        return resultMap;
    }

    public static void main(String[] args) {
        Result r1 = new Result(1, 1);
        Result r2 = new Result(1, 7);
        Result r3 = new Result(1, 7);
        Result r4 = new Result(1, 6);
        Result r5 = new Result(1, 6);
        Result r6 = new Result(1, 6);

        Result r7 = new Result(2, 6);
        Result r8 = new Result(2, 6);
        Result r9 = new Result(2, 7);
        Result r10 = new Result(2, 6);
        Result r11 = new Result(2, 6);
        Result[] arr = {r1, r2, r3, r4, r5, r6, r7, r8, r9, r10, r11};
        Map<Integer, Double> res = getHighFive(arr);

        System.out.println(res.get(1) + " " +res.get(2));
    }
}