@Override
    public Object getValueAt(int row, int col)
    {
       StockItem s = info.get(row);
       switch (col)
       {
           case 0: return s.getChargeNo();
           case 1: return s.getMaterial().getName();
           case 2: return s.getCoilType().getThickness();
           case 3: return s.getLength();
           case 4: return s.getCoilType().getWidth();
           case 5: return s.getStockQuantity();
       }
       return null;
    }