Java PrintStream.printf(): Difference between revisions
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=External= | |||
* Format string syntax https://docs.oracle.com/javase/8/docs/api/java/util/Formatter.html#syntax | |||
* https://docs.oracle.com/javase/8/docs/api/java/io/PrintWriter.html#printf-java.lang.String-java.lang.Object...- | |||
=Internal= | =Internal= | ||
* [[java Format#Subjects|java Format]] | * [[java Format#Subjects|java Format]] | ||
=Overview= | |||
<pre> | |||
pw.printf("%s: %d", s, i); | |||
</pre> | |||
<pre> | |||
System.out.printf("float: %2.2f\n",f); | |||
</pre> | |||
=Features= | |||
==Leading Space Padding== | |||
This is useful when numbers with different lengths are required to be displayed aligned to the right. | |||
Left-padding with spaces is achieved as follows: | |||
System.out.printf("%<b>''width''</b>s", ''number'') | |||
The number will be converted to string and will be right justified, with the rest of the space willed with ' ', at the left. | |||
==Trailing Space Padding== | |||
System.out.printf("%-<b>''width''</b>s", ''something'') | |||
==Hexadecimal Output== | |||
System.out.printf("%x", value) | |||
Latest revision as of 19:20, 12 July 2018
External
- Format string syntax https://docs.oracle.com/javase/8/docs/api/java/util/Formatter.html#syntax
- https://docs.oracle.com/javase/8/docs/api/java/io/PrintWriter.html#printf-java.lang.String-java.lang.Object...-
Internal
Overview
pw.printf("%s: %d", s, i);
System.out.printf("float: %2.2f\n",f);
Features
Leading Space Padding
This is useful when numbers with different lengths are required to be displayed aligned to the right.
Left-padding with spaces is achieved as follows:
System.out.printf("%widths", number)
The number will be converted to string and will be right justified, with the rest of the space willed with ' ', at the left.
Trailing Space Padding
System.out.printf("%-widths", something)
Hexadecimal Output
System.out.printf("%x", value)