java - 如何计算 ArrayList 中单词出现的次数？

Question

如何计算 ArrayList 中单词出现的次数？有人可以帮我吗？

Answer 1

如果您只想查找有多少匹配项并且不需要知道位置，请尝试使用此

BufferedReader reader = new BufferedReader(new FileReader("hello.txt"));
    StringBuilder builder = new StringBuilder();
    String str = null;
    while((str = reader.readLine()) != null){
        builder.append(str);
    }

    String fileString = builder.toString();
    String match = "wordToMatch";
    String[] split = fileString.split(match);
    System.out.println(split.length - 1);//finds amount matching exact sentance