code: public boolean getBoolean(String fieldName) throws DbfException {
          Boolean value = (Boolean) get(fieldName);
          return value != null && value;
      }
docs: Retrieves the value of the designated field as boolean.
  
  @param fieldName the name of the field
  @return the field value, or false (if the dbf value is NULL)
  @throws DbfException if there's no field with name fieldName