如何计算每个单词的出现次数？ [英] How to count the number of occurrences of each word?

问题描述

如果我有一篇英文文章或一本英文小说，我想计算每个单词出现的次数，用Java编写的最快的算法是什么？

If I have an article in English, or a novel in English, and I want to count how many times each words appears, what is the fastest algorithm written in Java?

有人说你可以使用地图< String，Integer>（）来完成这个，但我想知道我怎么知道是什么关键词？

Some people said you can use Map < String, Integer>() to complete this, but I was wondering how do I know what is the key words? Every article has different words and how do you know the "key" words then add one on its count?

推荐答案

    Map<String, Integer> countByWords = new HashMap<String, Integer>();
    Scanner s = new Scanner(new File("your_file_path"));
    while (s.hasNext()) {
        String next = s.next();
        Integer count = countByWords.get(next);
        if (count != null) {
            countByWords.put(next, count + 1);
        } else {
            countByWords.put(next, 1);
        }
    }
    s.close();

这个计数I'm只有一个字

this count "I'm" as only one word

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