Java将Hashmap放入Treemap [英] Java putting Hashmap into Treemap

问题描述

我目前正在从上一个问题中询问的文本文件中读取 200 万行Java 读取文本文件的最快方式200万行

I am currently reading 2 million lines from a textfile as asked in the previous question Java Fastest way to read through text file with 2 million lines

现在我将这些信息存储到 HashMap 中，我想通过 TreeMap 对其进行排序，因为我想使用天花板键.下面的方法对吗?

Now I store these information into HashMap and I want to sort it via TreeMap because I want to use ceilingkey. Is the following method correct?

private HashMap<Integer, String> hMap = new HashMap();

private TreeMap<Integer, String> tMap = new TreeMap<Integer, String>(hMap);

推荐答案

HashMap<Integer, String> hashMap = new HashMap<Integer, String>();
TreeMap<Integer, String> treeMap = new TreeMap<Integer, String>();
treeMap.putAll(hashMap);

无论如何都应该工作.

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