title: File extension for a Serialized object
body: <p>What file extension would be most suitable when saving a <code>Serializable</code> object to disk?</p>
  
  <pre><code>FileOutputStream fos = null;
  ObjectOutputStream out = null;
  try {
      fos = new FileOutputStream(filename);
      out = new ObjectOutputStream(fos);
      out.writeObject(mySerializableObject);
  } catch (IOException ex) {
      ex.printStackTrace();
  } finally {
      IOUtils.closeQuietly(out);
  }
  </code></pre>