Convert String to Float with Java comma

Question

How do I convert in an elegant way String for float java?

The strings are with the Brazilian localization, that is, the values come with comma as decimal separator ("12.345").

I find it so... "ugly" to wear

        String preco = request.getParameter("preco");
        try {                
            cadastro.setPreco(Float.valueOf(preco.replace(",", ".")));                
        } catch (Exception e)
        {
            cadastro.setPreco(0);
        }

I can’t believe that Java doesn’t have any location...?

Answer 1

One of the ways I know is by using Numberformat:

public static void main(String[] args) {
    String numero = "199";
    System.out.println(NumberFormat.getCurrencyInstance().format(Float.parseFloat(numero)));
}

Iprime: R$ 199,00

---

Updated

To receive numbers with commas you can do as follows:

public static double converte(String arg) throws ParseException{
    //obtem um NumberFormat para o Locale default (BR)
    NumberFormat nf = NumberFormat.getNumberInstance(new Locale("pt", "BR"));
    //converte um número com vírgulas ex: 2,56 para double
    double number = nf.parse(arg).doubleValue();
    return number;
}

public static void main(String[] args) throws ParseException {
    String numero = "199,99";
    BigDecimal bg = new BigDecimal(converte(numero)).setScale(2, RoundingMode.HALF_EVEN);
    System.out.println(bg);
}

I edited the answer and made a conversion of the value to BigDecimal, which is the most recommended format for working with currencies. In the future you can refactor your code and work directly with the BigDecimal. That method converte may be a method of Utility Class.

See it working on Ideone: https://ideone.com/cZ73CB