How to format Double with dot?

How do I format a Double with String.format to String with a dot between the integer and decimal part?

String s = String.format("%.2f", price);

The above formats only with a comma: ",".

String.format(String, Object ...) is using your JVM's default locale. You can use whatever locale using String.format(Locale, String, Object ...) or java.util.Formatter directly.

String s = String.format(Locale.US, "%.2f", price);

or

String s = new Formatter(Locale.US).format("%.2f", price);

or

// do this at application startup, e.g. in your main() method
Locale.setDefault(Locale.US);

// now you can use String.format(..) as you did before
String s = String.format("%.2f", price);

or

// set locale using system properties at JVM startup
java -Duser.language=en -Duser.region=US ...

Based on this post you can do it like this and it works for me on Android 7.0

import java.text.DecimalFormat
import java.text.DecimalFormatSymbols

DecimalFormat df = new DecimalFormat("#,##0.00");
df.setDecimalFormatSymbols(new DecimalFormatSymbols(Locale.ITALY));
System.out.println(df.format(yourNumber)); //will output 123.456,78

This way you have dot and comma based on your Locale

Answer edited and fixed thanks to Kevin van Mierlo comment

If it works the same as in PHP and C#, you might need to set your locale somehow. Might find something more about that in the Java Internationalization FAQ.