e, no seconds
18:05
Y
Four-digit year (with leading zeroes)
2004
y
Last two digits of the year (with leading zeroes)
04
C
First two digits of the year (with leading zeroes)
20
B
Full month name
February
b or h
Abbreviated month name
Feb
m
Two-digit month (with leading zeroes)
02
d
Two-digit day (with leading zeroes)
09
e
Two-digit day (without leading zeroes)
9
A
Full weekday name
Monday
a
Abbreviated weekday name
Mon
j
Three-digit day of year (with leading zeroes), between 001 and 366
069
H
Two-digit hour (with leading zeroes), between 00 and 23
18
k
Two-digit hour (without leading zeroes), between 0 and 23
18
I
Two-digit hour (with leading zeroes), between 01 and 12
06
l
Two-digit hour (without leading zeroes), between 1 and 12
6
M
Two-digit minutes (with leading zeroes)
05
S
Two-digit seconds (with leading zeroes)
19
L
Three-digit milliseconds (with leading zeroes)
047
N
Nine-digit nanoseconds (with leading zeroes)
047000000
P
Uppercase morning or afternoon marker
PM
p
Lowercase morning or afternoon marker
pm
z
RFC 822 numeric offset from GMT
-0800
Z
Time zone
PST
s
Seconds since 1970-01-01 00:00:00 GMT
1078884319
E
Milliseconds since 1970-01-01 00:00:00 GMT
1078884319047
Table 3-6. Flags for printf
Flag
Purpose
Example
+
Prints sign for positive and negative numbers
+3333.33
space
Adds a space before positive numbers
| 3333.33|
0
Adds leading zeroes
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 %
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.
作者：kmlzkma
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