how to print a Double without commas

Question

When using toString(), Double adds commas (5143 is printed as 5,143). How to disable the commas?

Answer 1

NumberFormat format = NumberFormat.getInstance();

format.setGroupingUsed(false);

Answer 2

Probably, you have to change your locale settings. It is taken by default from system locale, but you can override this. Read javadoc on Locale class and this little tutorial to start. Locale can be specified through command line:

java -Duser.language=en -Duser.region=US MyApplication

Answer 3

As far as I am aware, you can not disable what the toString() method returns.

My solution would be as follows:

someDouble.toString().replaceAll(",", "");

Not the most elegant solution, but it works.

Answer 4

I use this method to format a double to string with a fixed locale, no grouping and with a minimum and maximum of fraction digits

public String formatNumber(double number){
    NumberFormat nf = NumberFormat.getInstance(new Locale("en", "EN"));
    nf.setMaximumFractionDigits(3);  
    nf.setMinimumFractionDigits(1);
    nf.setGroupingUsed(false);
    String str = nf.format(number);
    return str;       
 }