如何使用java计算Vector中的不同元素？

Question

我手边有很多话。我需要做的是保存它们并计算每个不同的单词。原始数据可能包含一些重复的单词。首先，我想使用Set，然后我可以保证我只得到不同的wrods。但我怎么能算他们的时代？是否有人有任何“聪明”的想法？

Answer 1

您可以使用Guava库中的MultiSet。

http://docs.guava-libraries.googlecode.com/git/javadoc/com/google/common/collect/Multiset.html

Answer 2

您可以使用Map解决此问题。

String sample = " I have a problem here. I have a lot of words at hand. What I need to do is to save them and count every different word. The original data may contains duplicate words.Firstly, I want to use Set, then I can guarantee that I only get the different wrods. But how can I count their times? Is there someone having any clever idea?";
    String[] array = sample.split("[\\s\\.,\\?]");
    Map<String,Integer> statistic = new HashMap<String,Integer>();
    for (String elem:array){
        String trimElem = elem.trim();
        Integer count = 0;
        if(!"".equals(trimElem)){
            if(statistic.containsKey(trimElem)){
                count = statistic.get(trimElem);
            }
            count++;
            statistic.put(trimElem,count);
        }
    }

Answer 3

也许你可以在java中使用hash，它是HashMap（或HashSet？） 你可以散列每个单词，如果该单词已被散列，则将一个与之相关的值递增一，这就是想法。