Java Glossary : printf

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printf

the java.text.DecimalFormat and java.text.NumberFormat classes in JDK 1.1. Unfortunately, Java 1.0.2 has no equivalent to the C printf or sprintf function for formatting numbers for display. You have to roll your own. One such class is available from San Diego State University called sdsu.FormatString. Acme also has one. Eliote Rusty Harold did one. The Lava Rocks tutorials also includes one. Gary Cornell and Cay Horstmann's book Core Java 2 includes one.

Most people don't bother. You use the + concatenation operator instead of printf.

// in idiomatic Java you would say:
System.out.println( "x:" + x + " y:" + y );

// instead of C-style
System.out.printf( "x: %d y: %d", x, y );

Core Java 2, Volume I: Fundamentals (6th Edition)

0-13-047177-1

Cay Horstmann and Gary Cornell

Covers JDK 1.4 such as regular expressions, New I/O, assertions, Preferences, Swing enhancements and logging. Aimed at someone who already knows C++. This is not a fluffy introductory book.

format ¤ NumberFormat ¤ println format

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