docs: public void flushPTable(PTable pTable)
      {
          if (pTable.getLookupKey() instanceof String)
          {
              try   {
                  String strFilePath = (String)pTable.getLookupKey();
                  String strFilename = this.getFilename(strFilePath, true);
                  FileOutputStream ostream = new FileOutputStream(strFilename);
                  ObjectOutputStream p = new ObjectOutputStream(ostream);
  
                  p.writeObject(pTable); // Write the tree to the stream.
                  p.flush();
                  p.close();
                  ostream.close();    // close the file.
              } catch (IOException ex)    {
                  ex.printStackTrace();
              }
          }
      }