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IBM 484 : Design patterns Qs

Vishwa Kumba
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Joined: Aug 27, 2003
Posts: 1064
Do we need to cover all the 21 presentation, business and integration tier patterns explained in the Core J2EE Design Patterns book?
In the Sun's link provided in the resources section at the IBM site,
http://java.sun.com/blueprints/corej2eepatterns/Patterns/index.html
there are only 17 patterns.
Are there any questions related to GOF patterns also in the actual exam?
Nicholas Cheung
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Joined: Nov 07, 2003
Posts: 4982
The most frequently asked patterns are: MVC, Front Controller, Business Delegate, Session Facade, and Service Locator.
I think you just need to read those patterns that are covered by SCWCD, and well as some EJB patterns. You are not expected to know all GoF patterns.
Nick


SCJP 1.2, OCP 9i DBA, SCWCD 1.3, SCJP 1.4 (SAI), SCJD 1.4, SCWCD 1.4 (Beta), ICED (IBM 287, IBM 484, IBM 486), SCMAD 1.0 (Beta), SCBCD 1.3, ICSD (IBM 288), ICDBA (IBM 700, IBM 701), SCDJWS, ICSD (IBM 348), OCP 10g DBA (Beta), SCJP 5.0 (Beta), SCJA 1.0 (Beta), MCP(70-270), SCBCD 5.0 (Beta), SCJP 6.0, SCEA for JEE5 (in progress)
vasu maj
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Joined: Jul 12, 2001
Posts: 395
Will reading alone help understanding design patterns? I have seen very few design patterns in my experience - MVC, front controller, DAO etc. How often is it that Project leadership considers design patterns and anti patterns before they actually start development?
Vasu


What a wonderful world!
Vishwa Kumba
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Joined: Aug 27, 2003
Posts: 1064
Thanks Nick!
Originally posted by vasu maj:
Will reading alone help understanding design patterns? I have seen very few design patterns in my experience - MVC, front controller, DAO etc. How often is it that Project leadership considers design patterns and anti patterns before they actually start development?
Vasu

All practical projects with a desired & planned good delivery will have sensible architects. Patterns are proven solutions or ways of solving a particular problem. Good architects use patterns all the times.
Patterns doesn't have to be those mentioned in the GOF patterns book or J2EE design patterns book. A good solution that has been used before for a particular problem and if that can be re-used again for a similar problem now, could be a pattern ......GOF patterns and J2EE design patterns just happen to be the most frequently used patterns in the industry.
A few years ago, I was using Singleton and Factory methods in my projects. At that time, I did not know that they were standard patterns used in the industry and were part of the published GOF patterns.
Vishwa Kumba
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Joined: Aug 27, 2003
Posts: 1064
Originally posted by vasu maj:
Will reading alone help understanding design patterns?
Vasu

I am not familiar with the J2EE design patterns, except for those mentioned by you and Nick. For GOF patterns, I would suggest writing your own programs or understanding/practising standard programs using patterns code is a very good way of learning patterns........
vasu maj
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Joined: Jul 12, 2001
Posts: 395
I think the best way to learn about design patterns is by implementing them. Being aware of the patterns helps you to use them when you are desiging a solution. I think studying about anti patterns is equally important to avoid taking the wrong route.
Thanks,
Vasu
Kishore Dandu
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Joined: Jul 10, 2001
Posts: 1934
Sun's 'J2EE design patterns' book by Deepak Alur etc is also a good reference for J2EE related patterns knowledge.


Kishore
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