public Object getRealValueAt(int rowIndex, int columnIndex) {
        PartsBean bean = (PartsBean) data.get(rowIndex);
        switch (columnIndex) {
            case 0:
                return bean.getNumber();
            case 1:
                return bean.getManufacturer();
            case 2:
                return bean.getDescription();
            case 3:
                return bean.getCategory();
            case 4:
                return String.valueOf(bean.getQuantity());
            case 5:
                return bean.getSource();
            case 6:
                return String.valueOf(bean.getSrp());
            /*case 7:
                return bean.getDiscount();*/
            case 7:
                return bean.getMaximumLevel();
            case 8:
                return bean.getReorderLevel();
        }

        return "";

    }