Java防止科学计数法

public static String NonScientificNotation(String num)
 {
     Pattern pattern = Pattern.compile("-?[0-9]*.[0-9]*E[0-9]*");
     Matcher match   = null;
     match = pattern.matcher(num);
     if(match.matches())
    {
        BigDecimal decimal = new BigDecimal(num);
        num = decimal.toPlainString();
    }
    return num;
 }