set blank on jtable.



        for (int i = 0; i < addtocart.getRowCount(); i++)
        {
        for(int j = 0; j < addtocart.getColumnCount(); j++)
         {
          addtocart.setValueAt("", i, j);
         }
         }
      for (int i = 0; i < addtocart1.getRowCount(); i++)
        {
        for(int j = 0; j < addtocart1.getColumnCount(); j++)
         {
          addtocart1.setValueAt("", i, j);
         }

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