Force point (“.”) as decimal separator in java

Question

I currently use the following code to print a double:

return String.format(\"%.2f\", someDouble);

This works well, except that Java uses my

Answer 1

You can pass an additional Locale to java.lang.String.format as well as to java.io.PrintStream.printf (e.g. System.out.printf()):

import java.util.Locale;

public class PrintfLocales {

    public static void main(String args[]) {
        System.out.printf("%.2f: Default locale\n", 3.1415926535);
        System.out.printf(Locale.GERMANY, "%.2f: Germany locale\n", 3.1415926535);
        System.out.printf(Locale.US, "%.2f: US locale\n", 3.1415926535);
    }

}

This results in the following (on my PC):

$ java PrintfLocales
3.14: Default locale
3,14: Germany locale
3.14: US locale

See String.format in the Java API.