Vaadin sum calculation

Question

I am not able to add the fields, I have already tried several modifications in the code, but nothing worked.

My current code is this for the sum of the fields:

txtAmount.addValueChangeListener(event -> {

            NumberFormat formatter = NumberFormat.getCurrencyInstance(new Locale("pt", "BR"));
            double totalValue= 0;

            try {
                totalValue = formatter.parse(txtUnitaryValue.getValue()).doubleValue() * txtQuantidade.getValue();
            } catch (ParseException e) {
                // TODO Auto-generated catch block
                e.printStackTrace();
            }

            txtTotalItemValue.setValue(formatter.format(totalValue));

            addValues= totalValue;
            fieldAddsValues.setValue(formatter.format(addValues));

        });

Are you getting any exceptions? Try extracting both the number values into separate variables before multiplying them so it's easier to inspect their values with the debugger. — Marcus Hellberg, Mar 29 '21 at 17:26
Marcus, I don't get any exceptions ... Sorry, but I'm new to Vaadin / Java ... how could I do that? — Desenvolvimento FJ Sistemas, Mar 29 '21 at 17:30
Twistleton, I understand, but it takes away a doubt, in part of my current code, should I put this example that you gave me? And yes, Double — Desenvolvimento FJ Sistemas, Mar 29 '21 at 18:13
it worked, friend ... thank you very much for your help, if you want to post the code, mark it as the correct answer for you ... thank you very much !!! — Desenvolvimento FJ Sistemas, Mar 29 '21 at 18:56
By the way, for money matters you should be using `BigDecimal` rather than floating-point types float/Float/double/Double. — Basil Bourque, Mar 30 '21 at 05:35

Twistleton · Accepted Answer · 2021-03-29T19:04:41.337

4

To calculate the sum of all positions set this snippet in the txtAmount.addValueChangeListener block:

Double sum = listaVendas.stream().mapToDouble(product -> product.getPrice() * product.getQuantity()).sum();

edited Mar 29 '21 at 19:04

answered Mar 29 '21 at 18:58

Twistleton

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Vaadin sum calculation

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