code: public <T> T getValue(int idx, Class<T> cellClass) {
          Cell cell = getCellByIdx(idx);
          return cell == null ? null : cell.getValue(cellClass);
      }
docs: Returns the casted value of the {@link Cell} at position {@code idx} in the list of Cell object.
  
  @param idx       the index position of the Cell we want to retrieve
  @param cellClass the class of the cell's value
  @param <T>       the type of the cell's value
  @return the casted value of the {@link Cell} at position {@code idx} in the list of Cell object