DecimalFormat("#0.000") doesn't format the right way like 1.321 instead of this it delievers 1,321

Question

I want to get a Double with 3 decimalplaces. I do this:

String sAveragePrice;

Double dAveragePrice = holePrice/(allPrices.size());    // delivers 1.3210004       
DecimalFormat threeZeroes = new DecimalFormat("#0.000");
sAveragePrice = threeZeroes.format(dAveragePrice);          // delivers then 1,321

After formatting I dont get a 1.321 but 1,321. And the 1,321 throws a NumberformatException later. This is when it is thrown:

Double priceInt = Double.parseDouble(sAveragePrice);  // throws NumberFormatException

The strange thing is, I have this code till 3 weeks and it didn't make any problem. But today when I have started my app again it gets problem with it. But I didn't have changed anything.

Can anybody help me? I also tried this:

NumberFormat format = NumberFormat.getNumberInstance();
format.setMinimumFractionDigits(3);
format.setMaximumFractionDigits(3);
sAveragePrice = format.format(dAveragePrice);

But it also delivers me a "," instead of a "." for double.

Answer 1

Use this type of formatting use # instead of 0. It is the correct format to declare your pattern

String sAveragePrice;

Double dAveragePrice = holePrice/(allPrices.size());       
DecimalFormat threeZeroes = new DecimalFormat("#.###");
sAveragePrice = threeZeroes.format(dAveragePrice);   

Hope it will help you

Answer 2

Try using a locale for you number format.

Number format = NumberFormat.getNumberInstance(Locale.ITALIAN);

Java SDK has a limited number of predefined locale settings, so for other locales (e.g., for Russian), you can use the following snippet:

Number format = NumberFormat.getNumberInstance(new Locale("ru", "RU"));
Number format = NumberFormat.getNumberInstance(new Locale("it", "IT")); // etc... 

Answer 3

this sample code may help you...

    Locale locale = Locale.getDefault();
    // set Locale.US as default
    Locale.setDefault(Locale.US);
    DecimalFormat decimalFormat = new DecimalFormat("##.000");
    double d = 14.5589634d;
    String format = decimalFormat.format(d);
    System.out.println(format);// prints 14.559
    // back to default locale
    Locale.setDefault(locale);

Answer 4

Have a look at this SO question

How to change the decimal separator of DecimalFormat from comma to dot/point?

Basically your output will be Locale specific, so if you have a Locale of Frame then it will be different to a Locale of the US.

try

NumberFormat format = NumberFormat.getNumberInstance(Locale.US);