我正在嘗試對HashMap<String, Long>. 我有以下排序代碼：private static class ValueComparator implements Comparator<String>{            HashMap<String, Long> map = new HashMap<String, Long>();            public ValueComparator(HashMap<String, Long> map){                this.map.putAll(map);            }            @Override            public int compare(String s1, String s2) {                if(map.get(s1) > map.get(s2)){                    System.out.println("s1: " + s1 + "; s2: " + s2);                    return -1;                }                else if (map.get(s1).equals(map.get(s2))) {                    return 0;                }                else{                    return 1;                }            }        }private static TreeMap<String, Long> sortMapByValue(HashMap<String, Long> map){                Comparator<String> comparator = new ValueComparator(map);                //TreeMap is a map sorted by its keys.                //The comparator is used to sort the TreeMap by keys.                TreeMap<String, Long> result = new TreeMap<String, Long>(comparator);                result.putAll(map);                System.out.println("DONE sort");                return result;        }問題是，當幾個不同的鍵具有相同的值時，只有一個鍵會進入最終映射：例子： public class Test  {    public static void main(String[] args)  {        HashMap<String, Long> hashMap = new HashMap<>();        hashMap.put("Cat", (long) 4);        hashMap.put("Human", (long) 2);        hashMap.put("Dog", (long) 4);        hashMap.put("Fish", (long) 0);        hashMap.put("Tree", (long) 1);        hashMap.put("Three-legged-human", (long) 3);        hashMap.put("Monkey", (long) 2);        System.out.println(hashMap);  //7 pairs        System.out.println(sortMapByValue(hashMap));  //5 pairs   }}我將如何修復它？