Java中数字处理去掉末尾的0

public static String insertComma(String s, int len) {    if (s == null || s.length() < 1) {        return "";    }    NumberFormat formater = null;    double num = Double.parseDouble(s);    if (len == 0) {        formater = new DecimalFormat("###,###");     } else {        StringBuffer buff = new StringBuffer();        buff.append("###,###.");        for (int i = 0; i < len; i++) {            buff.append("#");        }        formater = new DecimalFormat(buff.toString());    }    return formater.format(num);}

double num = 5.5500;DecimalFormat decimalFormat = new DecimalFormat("##########.##########");String numConverted = decimalFormat.format(num); //5.55


利用“########.##########”