java HashMap排序< String，Integer> .如何排序?

问题描述

在我的项目中，我采用了这样的HashMap

In my project, I have taken a HashMap like this

假设我有:

degree.put("a",5);
degree.put("b",2);
degree.put("c",4);
degree.put("d",2);
degree.put("e",3);
degree.put("f",5);

排序的HashMap应该是:

Sorted HashMap Should be :

我该怎么做?

推荐答案

HashMap是无序集合.它没有排序顺序.甚至TreeMap也会按键而不是值进行排序.

A HashMap is an unordered collection. It has no sort order. Even a TreeMap will sort by key, not value.

如果要按值的排序顺序准备排序列表，则必须创建一个适当的对象(例如ArrayList<Map.Entry<String,Integer>>)，遍历HashMap并插入所有条目，然后使用整理功能调用Collections.sort.

If you want to prepare a sorted list by the sort order of the values, you'll have to create an appropriate object, such as an ArrayList<Map.Entry<String,Integer>>, iterate over your HashMap and insert all the entries, and then call Collections.sort with a collation function.

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