文件閱讀器

午安請解釋一下 FileReader 的操作方法。它是否會讀取整行，然後轉到下一行？還是用符號？在這段程式碼中：這些行到底做了什麼：

 BufferedReader reader = new BufferedReader(new InputStreamReader(System.in)); BufferedReader fileReader = new BufferedReader(new FileReader(reader.readLine())); ArrayList
  lines = new ArrayList
  
   (); String line; while((line = fileReader.readLine()) != null) { int i = Integer.parseInt(line); lines.add(i); }

String line; while((line = fileReader.readLine()) != null){}

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