Built in methods for displaying Significant figures

Question

There\'s been a lot of questions on rounding by significant figures, and answers that that provides a new method to do the rounding, such as:

Rounding to an arbitrar

Answer 1

Not quite right. To get it perfect:

public String toSignificantFiguresString(BigDecimal bd, int significantFigures ){
    String test = String.format("%."+significantFigures+"G", bd);
    if (test.contains("E+")){
        test = String.format(Locale.US, "%.0f", Double.valueOf(String.format("%."+significantFigures+"G", bd)));
    }
    return test;
}