java - 需要有关 String.format 的一些帮助

Question

我正在尝试找到有关在 java 中格式化字符串的完整教程。

我需要创建收据，如下所示:

       HEADER IN MIDDLE
''''''''''''''''''''''''''''''
Item1                   Price
Item2 x 5               Price
Item3 that has a very
long name....           Price
''''''''''''''''''''''''''''''
Netprice:                 xxx
Grossprice:               xxx
VAT:                      xxx
Shipping cost:            xxx
Total:                    xxx
''''''''''''''''''''''''''''''
      FOOTER IN MIDDLE

Answer 1

传递给 string.format 的格式记录如下:

http://java.sun.com/j2se/1.5.0/docs/api/java/util/Formatter.html#syntax

来自页面:

The format specifiers for general, character, and numeric types have the following syntax:

   %[argument_index$][flags][width][.precision]conversion

The optional argument_index is a decimal integer indicating the position of the argument in the argument list. The first argument is referenced by "1$", the second by "2$", etc.

The optional flags is a set of characters that modify the output format. The set of valid flags depends on the conversion.

The optional width is a non-negative decimal integer indicating the minimum number of characters to be written to the output.

The optional precision is a non-negative decimal integer usually used to restrict the number of characters. The specific behavior depends on the conversion.

The required conversion is a character indicating how the argument should be formatted. The set of valid conversions for a given argument depends on the argument's data type.