import java.math.RoundingMode;
import java.text.DecimalFormat;
import java.text.DecimalFormatSymbols;
import java.text.NumberFormat;
import java.util.Locale;

class Scratch {
    public static DecimalFormat createDecimalFormat(int accuracy) {
        DecimalFormat format = (DecimalFormat) NumberFormat.getInstance(Locale.getDefault());
        DecimalFormatSymbols symbols = format.getDecimalFormatSymbols();
        symbols.setGroupingSeparator(' ');
        symbols.setDecimalSeparator('.');
        format.setDecimalFormatSymbols(symbols);
        format.setMinimumFractionDigits(accuracy);
        format.setMaximumFractionDigits(accuracy);
        return format;
    }

    public static void main(String[] args) {
        final DecimalFormat decimalFormat = createDecimalFormat(2);
        System.out.println(decimalFormat.format(16.665));
        decimalFormat.setRoundingMode(RoundingMode.HALF_UP);
        System.out.println(decimalFormat.format(16.665));
    }
}