How to Java String.format with a variable precision?

Question

I\'d like to vary the precision of a double representation in a string I\'m formatting based on user input. Right now I\'m trying something like:

String foo          


        

Answer 1

Why not :

String form = "%."+precision+"f\n";
String foo = String.format(form, my_double);

or :

public static String myFormat(String src, int precision, Object args...)
{
    String form = "%."+precision+"f\n";
    return String.format(form, args);
}