What is this formatting? System.out.format...
System.out.format(" %1$02x", ..... );
Can anyone explain what is this formatting?
Last Comment
this is format struing syntaz
the same for System.out.printf or Systemm.out.format
http://download.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html#syntax
the same for System.out.printf or Systemm.out.format
http://download.oracle.com/javase/1.5.0/docs/api/java/util/Formatter.html#syntax
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So you see if I print 16 it will print 10 (in hexadecimal - two positoions, as exopected)
Output:
int mynum = 16;
System.out.format(" %1$02x",mynum );
Output:
10
And this is how it prints number 11 in hexadecimal - occupying two positions
int mynum = 11;
System.out.format(" %1$02x",mynum );
0b
ASKER
Hi for_yan,
this is the formatting syntax.
%[argument_index$][flags][
"%1$02x"
[argument_index$] is 1$ (which is the first argument <- understood)
[flags] is "0" (what is this flag about?)
[width] is "2" (2 character length?)
conversion is "x" (which is to hexadecimal base 16 <- understood)
The description used for flag is "The optional flags is a set of characters that modify the output format. The set of valid flags depends on the conversion."
this is the formatting syntax.
%[argument_index$][flags][
"%1$02x"
[argument_index$] is 1$ (which is the first argument <- understood)
[flags] is "0" (what is this flag about?)
[width] is "2" (2 character length?)
conversion is "x" (which is to hexadecimal base 16 <- understood)
The description used for flag is "The optional flags is a set of characters that modify the output format. The set of valid flags depends on the conversion."
Yes, 2 is charcter length for sure, I think zero is not a flag, but just part of the width 02 - ?
Flag General Character Integral Floating Point Date/Time Description
'-' y y y y y The result will be left-justified.
'#' y1 - y3 y - The result should use a conversion-dependent alternate form
'+' - - y4 y - The result will always include a sign
' ' - - y4 y - The result will include a leading space for positive values
'0' - - y y - The result will be zero-padded
',' - - y2 y5 - The result will include locale-specific grouping separators
'(' - - y4 y5 - The result will enclose negative numbers in parentheses
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ASKER
Yeah, I got that too!
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look ath these examples:
http://www.java2s.com/Code/JavaAPI/java.lang/System.out.printf.htm