检索出文本中出现次数最多的单词

原创转载请注明出处：http://agilestyle.iteye.com/blog/2392423

具体思路，将文本中的段落进行split拆分成一个个单词，然后遍历，放入map，统计每个单词出现的次数，最后放入list，按出现次数进行降序排列

Note:此方法不是最优解，还有更高效的算法，欢迎拍砖

package org.fool.test;

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

public class Test {
    public static void main(String[] args) {
        String str = "Ah, Ah, Ah, What the hell are you talking about, I have already told you what you should do, I really have no idea what you think about";
        String[] strings = str.replace('\'', ' ').replace(',', ' ').replace('.', ' ').split("\\s+");

        Map<String, Integer> map = new HashMap<>();
        for (String s : strings) {
            if (map.containsKey(s)) {
                map.put(s, map.get(s) + 1);
            } else {
                map.put(s, 1);
            }
        }

        List<Map.Entry<String, Integer>> list = new ArrayList<>(map.entrySet());

        list.sort((o1, o2) -> o2.getValue() - o1.getValue());

        System.out.println(list.get(0).getKey() + ":" + list.get(0).getValue());
        System.out.println(list.get(1).getKey() + ":" + list.get(1).getValue());
    }
}

Console Output