// In GWT array access never throws IndexOutOfBoundsException.
    checkElementIndex(rowIndex, rowList.size());
    checkElementIndex(columnIndex, columnList.size());
    V oldValue = array[rowIndex][columnIndex];
    array[rowIndex][columnIndex] = value;
    return oldValue;
  }

  /**
   * Returns a two-dimensional array with the table contents. The row and column indices correspond

    // In GWT array access never throws IndexOutOfBoundsException.
    checkElementIndex(rowIndex, rowList.size());
    checkElementIndex(columnIndex, columnList.size());
    V oldValue = array[rowIndex][columnIndex];
    array[rowIndex][columnIndex] = value;
    return oldValue;
  }

  /**
   * Returns a two-dimensional array with the table contents. The row and column indices correspond