数字以0补全

public static void main(String[] args) {
        NumberFormat formatter1 = NumberFormat.getNumberInstance();
        //5位数，前面补0
        formatter1.setMinimumIntegerDigits(5);
        formatter1.setGroupingUsed(false);
        String format = formatter1.format(56);
        System.out.println(format); //00056
    }