Java 小数点后为零则显示整数，否则保留两位小数

public static void main(String[] args) {
        String number = "90.3635";
        if(StringUtils.isNotBlank(number)){
            double n  = Double.valueOf(number);
            BigDecimal bg = new BigDecimal(n).setScale(2, RoundingMode.UP);
            double num = bg.doubleValue();
            long round = Math.round(num);
            if (round - num == 0) {
                System.out.println(String.valueOf((long) num));
            }else{
                System.out.println(num);
            }
        }
    }