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[java] 配列の指定された文字列の出現回数を数える

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初めに

javaに限らず、ある文字列の出現回数を求めたいときがあると思う。多くのプログラミング言語では関数を使えば簡単に実装できるが、簡単に実装する。

実装

List型引数を持ち、Mapを返り値に持つgetWordCountMap関数を実装した。

public static Map<String,Integer> getWordCountMap(List<String> wordList){
        Map<String,Integer> count = new HashMap<>();
        String[] count1 = new String[wordList.size()];
        int check=0;

        for(String s:wordList){
        check = 0;
          for(String key : count.keySet()){
                if(s.equals(key)){
                    check = 1;
                }
            }
            if(check == 0){
                count.put(s,1);
            }
            else{
                count.replace(s,count.get(s)+1);
            }
         }
        return count;
    }


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