weixin_39741250
weixin_39741250
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2019-10-13 08:03 阅读 344

在该限制下,如何使用最短代码的java实现该词频统计

20

#!/usr/bin/env python
import re, sys, collections

stops = open(’../stop_words.txt’).read().split(’,’)

words = re.findall(’[a-z]{2,}’, open(sys.argv[1]).read().lower())

counts = collections.Counter(w for w in words if w not in stops)

for (w, c) in counts.most_common(25):

print w, ’-’, c

上述示例代码为python版本的词频统计。功能如下:
导入stopwords和源文件,之后进行统计并输出。

问题:使用尽可能少的java代码来实现相同的功能,尽可能的调用函数

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1条回答 默认 最新

  • caozhy 从今以后生命中的每一秒都属于我爱的人 2019-10-13 09:30

    文件输入的功能你自己实现下,别的完全改写了。

    import java.util.HashMap;
    import java.util.regex.*;
    import java.util.Map;
    import java.util.*;
    
    class HelloWorld {
        public static void main(String []args) {
            String s = "someone says: hello world! hello, this website hello the people this is the java language.";
            Pattern pattern = Pattern.compile("[a-z]{2,}");
            Matcher matcher = pattern.matcher(s);
            Map<String, Integer> map = new HashMap<>();
            while (matcher.find()) {
                String word = matcher.group(0).toLowerCase();
                if(!map.containsKey(word))
                {
                    map.put(word, 1);
                }
                else
                {
                    int times = map.get(word) + 1;
                    map.remove(word);
                    map.put(word, times);
                }
            }
    
            //System.out.println(map);
            List<Map.Entry<String, Integer>> list = new ArrayList<Map.Entry<String, Integer>>(map.entrySet());
            list.sort(new Comparator<Map.Entry<String, Integer>>() {
              @Override
              public int compare(Map.Entry<String, Integer> o1, Map.Entry<String, Integer> o2) {
                  return o2.getValue().compareTo(o1.getValue());
              }
          });
            for (Map.Entry<String, Integer> mapping : list){
                System.out.println(mapping.getKey()+" - "+mapping.getValue());
            }    
        }
    }
    

    hello - 3
    the - 2
    this - 2
    website - 1
    world - 1
    java - 1
    someone - 1
    is - 1
    language - 1
    says - 1
    people - 1

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