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The moose likes Web Component Certification (SCWCD/OCPJWCD) and the fly likes Decorator Pattern ?? Big Moose Saloon
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Decorator Pattern ??

Nikita Deshmukh
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Joined: Jun 08, 2005
Posts: 38
Has anybody heard of something called as a decorator pattern. I am still using the older version of 310-080 study kit ....
Stefan Guilhen
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Joined: Jul 31, 2004
Posts: 61
The Decorator pattern is a well known pattern written by the Gang of Four (GoF). You can find further information about this and other very useful patterns checking their book:

Design Patterns - Elements of Reusable Object-Oriented Software
Erich Gamma, Richard Helm, Ralph Johnson and John Vlissides
Addison Wesley

This pattern provide an alternative to subclassing for extending functionality, that is, you can add responsabilities to an object that can be withdrawn later without using subclassing. The decorator acts as a wrapper that forwards requests to the decorated object and may optionally perform additional operations before or after forwarding the request.


SCJP 1.4, SCBCD 1.3<br />IBM 141, 484, 486
Sanjay pts
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Joined: Nov 07, 2000
Posts: 357
Decorator Pattern = WrapperClasses

Eat JAVA, Drink JAVA, Sleep Java
Nikita Deshmukh
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Joined: Jun 08, 2005
Posts: 38
Thank You so much for your detailed response ... That really helped.
bhilla ratna
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Joined: Jun 01, 2005
Posts: 59
I agree with you Gang of Four is a good book for patterns. I also find Head First Design patterns makes the concepts more clear


Ratna bhilla<br />SCJP 1.4, SCBCD 1.3, SCWCD 1.4
Kristin Stromberg
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Joined: May 17, 2005
Posts: 91
I'm a big fan of the Head First series myself. You can review a sample chapter from their Design Patterns book here. As luck would have it, this chapter is all about the Decorator pattern. Hopefully you'll like this chapter so much that you'll go out and buy the book like I did!
I agree. Here's the link:
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