工具箱

递归输出文件夹下的所有文件

    public static void listFileName(File file){
        File[] files = file.listFiles();
        for(File f : files){
            if(f.isDirectory()){
                listFileName(f);
            }
            System.out.println(f.getName());
        }
    }

统计某个单词出现的次数

public static int wordCount(String filePath, String word) throws IOException{
        int count = 0;
        BufferedReader reader = new BufferedReader(new FileReader(filePath));
        String line = "";
        while((line = reader.readLine()) != null){
            count += ((line.length() - line.replace(word, "").length()) % line.length()) / word.length();
        }
        reader.close();
        return count;
    }