View source for Java String.format()

=External=

* http://docs.oracle.com/javase/7/docs/api/java/lang/String.html#format%28java.lang.String,%20java.lang.Object...%29
* Format String syntax http://docs.oracle.com/javase/7/docs/api/java/util/Formatter.html#syntax

=Internal=

* [[java Format#Subjects|java Format]]
* [[java SimpleDateFormat| SimpleDateFormat]]
* [[java DecimalFormat|DecimalFormat]]
* [[java MessageFormat|MessageFormat]]

=String=

<pre>
String arg = "blah"
String.format("%1$-50s", arg);
</pre>

This formats the first argument (%1$) as a string "s", to occupy at least 50 characters (width) and it left-justifies it ("-").

For general argument types, the precision is the maximum number of characters to be written to the output.

==Parameterized Width==

<pre>
int width=10;
String format = "%1$-" + width + "s";
String.format(format, s);
</pre>

=Floating Point=

For the floating-point conversions 'e', 'E', and 'f' the precision is the number of digits after the decimal separator. The conversion is done with rounding:

<pre>
double arg = 77.999
String.format("%1$.2f", arg);
</pre>

will display "78.00"

=Integer=
<syntaxhighlight lang='java'>
int arg = 77
String.format("%1$3d", arg);
</syntaxhighlight>
will display " 77"
=Hexadecimal Integer=