การเขียนคำสั่งปิดแฟ้มไว้ใน finally

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รหัสที่ 10-15 การเขียนคำสั่งปิดแฟ้มไว้ใน finally

    ...
    PdfReader in = null;
    PdfStamper out = null;
    try {
      in = new PdfReader(inFile);
      out = new PdfStamper(in, new FileOutputStream(outFile));
      ...
    } catch (FileNotFoundException e) {
      ...
    } catch (DocumentException e) {
      ...
    } catch (IOException e) {
      ...
    } finally {
      if (in  != null) in.close();
      if (out != null) out.close();
    }

10. สิ่งผิดปกติ