import java.text.NumberFormat;
import java.util.Locale;
 
class Ideone
{
	public static void main (String[] args) throws java.lang.Exception
	{
        // locale pt-BR (português do Brasil), para usar a vírgula como separador decimal
        NumberFormat df = NumberFormat.getInstance(new Locale("pt", "BR"));
 
        double a = 1.1;
        System.out.println(df.format(a));
 
        a = 1.111;
        System.out.println(df.format(a));
	}
}

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