code: public Cell<C, T> columnDefaults(int column) {
          Cell<C, T> cell = columnDefaults.size() > column ? columnDefaults.get(column) : null;
          if (cell == null) {
              cell = toolkit.obtainCell(this);
              cell.clear();
              if (column >= columnDefaults.size()) {
                  for (int i = columnDefaults.size(); i < column; i++)
                      columnDefaults.add(null);
                  columnDefaults.add(cell);
              } else
                  columnDefaults.set(column, cell);
          }
          return cell;
      }
docs: Gets the cell values that will be used as the defaults for all cells in
  the specified column. Columns are indexed starting at 0.