docs: public String getString() 
      {
          String string = super.getString();
          if ((string != null) && (string.length() > 0))
          {
              StringBuffer sb = new StringBuffer(string);
              if (sb.length() > m_iUnmaskedChars)
              {
                  String strFiller = "" + FILLER;
                  for (int i = 0; i < sb.length() - m_iUnmaskedChars; i++)
                  {
                      sb.replace(i, i+1, strFiller);
                  }
                  string = sb.toString();
              }
          }
          return string;
      }