public static void main(String[] args) throws IOException {    /*     * 1.打開一個(gè)file     * 2.new一個(gè)InputStreamReader←FileInputStream←file     * 3.用BufferedReader（←InputStreamReader）的readLine()方法讀取     * */    File ctoFile = new File("C://Users//gl//Desktop//ku//51cto.txt");    InputStreamReader rdCto = new InputStreamReader(new FileInputStream(ctoFile));    BufferedReader bfReader = new BufferedReader(rdCto);    String txtline = null;    while ((txtline = bfReader.readLine()) != null) {      System.out.println(txtline);    }    bfReader.close();  };