Difference between revisions of "Formatting"
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== Introduction == | == Introduction == | ||
+ | * String formatting can be done using the printf() and the format() methods added in java.io.PrintStream (System.out is a PrintStream) | ||
+ | * Internally they ise the java.util.Formatter class. | ||
+ | * Basic format: | ||
+ | printf("format string", argument(s)); | ||
+ | |||
+ | == Format String == | ||
+ | |||
+ | * Syntax: | ||
+ | |||
+ | %[arg_index$][flags][width][.precision] conversion_char | ||
+ | |||
+ | Arguments within [] are optional. Only the conversion_char is mandatory. The following are the conversion chars: | ||
+ | |||
+ | * b - boolean | ||
+ | * c - char | ||
+ | * d - integer | ||
+ | * f - floating point | ||
+ | * s - string | ||
+ | |||
+ | Optional arguments | ||
+ | |||
+ | * arg_index is the number of the argument followed by a $. The no starts from 1. | ||
+ | |||
+ | <syntaxhighlight lang="java5"> | ||
+ | |||
+ | System.out.printf("%2$s , %1$s", Suhrid, Karthik); | ||
+ | //Prints : Karthik, Suhrid | ||
+ | |||
+ | </syntaxhighlight> | ||
[[Category:OCPJP]] | [[Category:OCPJP]] |
Revision as of 02:13, 8 July 2011
Introduction
- String formatting can be done using the printf() and the format() methods added in java.io.PrintStream (System.out is a PrintStream)
- Internally they ise the java.util.Formatter class.
- Basic format:
printf("format string", argument(s));
Format String
- Syntax:
%[arg_index$][flags][width][.precision] conversion_char
Arguments within [] are optional. Only the conversion_char is mandatory. The following are the conversion chars:
- b - boolean
- c - char
- d - integer
- f - floating point
- s - string
Optional arguments
- arg_index is the number of the argument followed by a $. The no starts from 1.
System.out.printf("%2$s , %1$s", Suhrid, Karthik);
//Prints : Karthik, Suhrid