按值排序哈希表 [英] sort hashtable by values

问题描述

如果我有一个Hashtable，我想按值排序，即：整数按降序排列。如何执行此操作并能够打印所有键值对？

If I have a Hashtable and I want to sort it by the value, i.e: integer in a descending order. How can I do this and be able to print through all of the key - value pair?

推荐答案

转移为列表并对其进行排序：

Transfer as List and sort it:

    public static void sortValue(Hashtable<?, Integer> t){

       //Transfer as List and sort it
       ArrayList<Map.Entry<?, Integer>> l = new ArrayList(t.entrySet());
       Collections.sort(l, new Comparator<Map.Entry<?, Integer>>(){

         public int compare(Map.Entry<?, Integer> o1, Map.Entry<?, Integer> o2) {
            return o1.getValue().compareTo(o2.getValue());
        }});

       System.out.println(l);
    }

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