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Mr. Happy Object teaches static methods
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Page 3 of 3
Utility classes have another use. Sometimes you cannot extend a class because it is declared final. Utility classes are an excellent place to put methods that you would have otherwise put into a subclass.
About the author
Tony Sintes is an independent consultant and founder of First Class Consulting, Inc., a consulting firm that specializes in the bridging of disparate enterprise systems and training. Outside of First Class Consulting, Tony is an active freelance writer as well as author of Sams Teach Yourself Object-Oriented Programming in 21 Days (Sams, 2001; ISBN: 0672321092).- Feedback
More from JavaWorld
Resources
- To download the MrHappyObject source code, go to
http://www.javaworld.com/javaworld/javaqa/2001-11/mrhappy/03-qa-1121-mrhappy.zip - "Effective Object-Oriented Design," Tony Sintes (JavaWorld, May 2001)
http://www.javaworld.com/javaworld/javaqa/2001-05/01-qa-0504-oo.html - "Factory Methods," Tony Sintes (JavaWorld, May 2001)
http://www.javaworld.com/javaworld/javaqa/2001-05/02-qa-0511-factory.html? - More lessons from Mr. Happy Object in JavaWorld:
- "The Truth About Private," Tony Sintes (October 2000)
- "Client Callbacks," Tony Sintes (August 2000)
- Effective Java Programming Language Guide, Joshua Bloch (Addison Wesley Professional, 2001; ISBN0201310058)
http://www.amazon.com/exec/obidos/ASIN/0201310058/javaworld - Example utility classes in the JDK:
- Be sure to check out Tony's suggested reading list at
http://www.firstclassconsulting.net/reading.html - Want more? See the Java Q&A Index for the full Q&A catalog
http://www.javaworld.com/columns/jw-qna-index.shtml - For over 100 insightful Java tips from some of the best minds in the business, visit JavaWorld's Java Tips Index
http://www.javaworld.com/columns/jw-tips-index.shtml - Learn the basics of client-side Java in our Java Beginner discussion. Core topics include the Java language, the Java Virtual Machine, APIs, and development tools
http://forums.idg.net/webx?50@@.ee6b804 - Sign up for JavaWorld's free Core Java newsletter
http://www.idg.net/jw-subscribe - You'll find a wealth of IT-related articles from our sister publications at IDG.net
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