private void writeObject(ObjectOutputStream out) throws IOException {
  if (diff == null) {
    out.writeBoolean(false);
  }
 else {
    out.writeBoolean(false);
    out.writeUTF(diff);
  }
}

private void writeObject ( ObjectOutputStream out ) throws IOException { if ( diff == null ) { out . writeBoolean ( false ) ; } else { out . writeBoolean ( false ) ; out . writeUTF ( diff ) ; } }
writes : < br > boolean - true if this certificate has a diff string , false otherwise , followed by < br > writeutf ( ) of string ( if presented )
