格式浮点数带前导零[重复]

This question already has an answer here:

这个问题在这里已有答案:

printf how to do floating points with leading zeros 3 answers

printf如何用前导零3个答案做浮点数

Why does

System.out.format("%03.3f", 1.23456789);

print 1.235 instead of 001.235?

打印1.235而不是001.235?

How has my format string to look like to get 001.235 as output of the following code line?

我的格式字符串如何将001.235作为以下代码行的输出?

System.out.format(format, 1.23456789);

2 个解决方案

#1

Number after %0 here defines full width including decimal point, so you need to change it to 7:

此后%0之后的数字定义包括小数点的全宽,因此您需要将其更改为7:

System.out.format("%07.3f", 1.23456789);

#2

DecimalFormat formatter = (DecimalFormat)NumberFormat.getNumberInstance(Locale.US);
formatter.applyPattern("000.###");
System.out.format(formatter.format(1.23456789));

Result:

001.234

Demo

#1