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printf(String format, Object... o)

String.format(String format, Object... o)

e.g.

Calendar c = Calendar.getInstance(); String s = String.format("Time: %1$tH:%1$tM", c)

Format specifiers for general, character and numeric types

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

flags
-	(hyphen)left justified
+	always include sign
	(space) include leading space
0	zero padded
,	include locale specific grouping separators
(	enclose negative numbers in parentheses
width	minimum number of characters

Format specifiers for dates and times

%[argumentIndex$][flags][width]conversion

conversion:

this is always two characters beginning with t or T

Format specifiers which don't correspond to arguments

%[argumentIndex$][flags]conversion

e.g. %n platform specific new line

General conversions

flags
b or B	Boolean e.g. true or TRUE
h or H	Hashcode, null or Integer.toHexString(arg.hashCode())
s or S	Null or if arg implements Formattable arg.formatTo() else arg.toString()
c or C	Unicode character
d	Decimal
o	Octal
x or X	Hexidecimal
e or E	Scientific
f	Floating point
g or G	Decimal or scientific depending on precision and value after rounding
a or A	Hexidecimal floating with significand and exponent

Date conversions (precede with t or T

flags
B	Full month name
h or b	3 character month name
A	Locale specific full weekday name
a	Locale specific short weekday name
C	Century
Y	4 digit year
y	2 digit year
j	Day of year
m	2 digit month number
d	2 digit day of month number
e	1 or 2 digit day of month number

Time conversions (precede with t or T)

flags
H	Hour 24hr
I	Hour 12hr (2 digits)
k	Hour 12hr (1 or 2 digits)
M	Minute (2 digits)
S	Second (2 digits)
L	Millisecond (3 digits)
N	Nanosecond (9 digits)
p or P	am/pm or AM/PM
z	GMT offset
Z	Timezone
s	Seconds since 1/1/1970
Q	Milliseconds since 1/1/1970

Date & Time shortcuts (for uppercase precede with T not t)

flags
tR	%tH:%tM
tT	%tH:%tM:%tS
tr	%tI:%tM:%tS %tP
tD	%tm/%td/%tY
tF	%tY-%tm-%td
tc	%ta %tb %td %tT %tZ %tY