JDK5.0的11个主要新特征-Java技术

003333.33

-

Left-justifies field

|3333.33 |

(

Encloses negative number in parentheses

(3333.33)

,

Adds group separators

3,333.33

# (for f format)

Always includes a decimal point

3,333.

# (for x or o format)

Adds 0x or 0 prefix

0xcafe

^

Converts to upper case

0XCAFE

$

Specifies the index of the argument to be formatted; for example, %1$d %1$x prints the first argument in decimal and hexadecimal

159 9F

<

Formats the same value as the previous specification; for example, %d %<x prints the same number in decimal and hexadecimal

　　这里是一些简单的介绍，更详细的说明请参考：

　　Core Java 2 Volume I - Fundamentals, Seventh Edition

　　Core Java 2 Volume II - Advanced Features, Seventh Edition

　　里面都有一些很精彩的描述，中文名称就是《Java核心技术》。只有第七版才有J2SE5.0的介绍，但是第七版好像还没有中文版。本文还参考了Professional Java JDK - 5th Edition.

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