How fetch a Cell value from a column in TableView javafx?

Question

I am working on a basic billing application, totally new to javafx. Am done with adding and deleting the products from the table and also finding out the

Answer 1

You don't get the data from the cell, you get it from the model:

double totalCostOfSelectedItems = 0 ;
for (Data product : productSelected) {
    totalCostOfSelectedItems = totalCostOfSelectedItems + product.getRTotal();
}
finalCost = finalCost - totalCostOfSelectedItems() ;

allProducts.removeAll(productSelected);

And of course you could always just recompute the total after removal instead, which would only be a performance issue if you had a huge number of products in the table:

allProducts.removeAll(productSelected) ;
finalCost = allProducts.stream().collect(Collectors.summingDouble(Data::getRTotal));
// update label...