[appengine-java] There is a problem about arraylist and integer.parse().

[CJ]

I'm a college student. So this problem may be a little silly. Thanks
to help me.
Why it always throw the NumberFormatException?
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ArrayList<Integer> inputNum = new ArrayList<Integer>();

  try {
      System.out.println(" Please input an integer：");
      while (true) {
            byte buffer[] = new byte[128];
            System.in.read(buffer);
            if ("end".equals(buffer.toString().trim())) {
        break;
            }
            else {
        inputNum.add(Integer.parseInt(buffer.toString().trim()));
            }
      }
   }
   catch (IOException e) {
         System.out.println(e.toString());
    }
   catch (NumberFormatException e) {
     System.out.println("Please input an integer.");
    }
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