code: public final DataSet rows(Object[][] rows) {
      checkIfNotReadOnly();
      for (Object[] columnValues : rows) {
        addRow(new Row(columnValues));
      }
      return this;
    }
docs: Add rows to the data set.
  @param rows Array of rows.
  @return The data set instance (for chained calls).
  @throws InvalidOperationException if this data set is read-only.
  @see #row(Object...)
  @see #add(DataSet)
  @see #isReadOnly()