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A design pattern is a description of communicating objects and classes that are customized to solve a general software design problem within a particular context. [FAQ Previously managed by John Mitchell and John Moore].

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How can I implement the MVC design pattern using JSP?
Process:Patterns, Java:API:JSP:Architecture
Byron Tymvios, May 24, 2006
The MVC (Model View Controller) design pattern is a pattern/architecture that can be used by GUI's. It seperates the application's data, user interface...
Is there a pattern to avoid many if else if / switch conditions Say I have a javaBean with 4 string attributes say XXX and also the corresponding setXXX() and getXXX() In my application I have an...
Process:Patterns:Design
Lakshmi Kollipara, Aug 25, 2004
How is JDO different from VO ?
Java:API:EJB, Process:Patterns:BestPractices
Nick Maiorano PREMIUM, Apr 23, 2003
JDO is a persistence technology that competes against entity beans in enterprise application development. It allows you to create POJOs (plain old java...

What is session facade?
Java:API:EJB, Process:Patterns:Design
Alessandro A. Garbagnati PREMIUM, Feb 25, 2003
Session facade is one design pattern that is often used while developing enterprise applications. It is implemented as a higher level component (i.e.:...
Is there some kind of Design pattern which would make it possible to use the Same code base in EJB and non EJB context?
Java:API:EJB, Process:Patterns
Jan Matèrne PREMIUM, Jan 26, 2003
A good suggestion would be using Delegation class PieceOfCode { public Object myMethod() {} } class EJBImpl ... { PieceOfCode poc = new...
What is the best way to generate a universally unique object ID? Do I need to use an external resource like a file or database, or can I do it all in memory?
Languages:Markup:XML, Java:API:Servlets, Java:API:JDBC, Java:API:EJB:EntityBean:Primary Keys, Process:Patterns:BestPractices
Alessandro A. Garbagnati PREMIUM, Nov 25, 2002
[I need to generate unique id's that will be used for node 'ID' attribute values within XML documents. This id must be unique system-wide. The generator...
How can I maintain a single instance of an object in an applet?
Java:API:Applets, Process:Patterns:Design
Kumar Pandey, Feb 27, 2002
In start(), instead of always creating a new object, return the existing one if it exists or create a new one if it doesn't.
Is it correct from a design point of view to make an object both an Observer and Observable at the same time?
Process:Patterns
Michael Wax, Jun 15, 2001
Yes, and this can be the preferred pattern in some cases.For example, suppose you were writing a supply chain management system for a retail chain. Each...
Where can I learn (more) about using UML (Unified Modeling Language) with Java?
Java:Language, Tools, Process:Patterns, Certification:Java, General:FAQs
John Mitchell PREMIUM, May 31, 2001
Check out the jGuru UML FAQ.
Where can I learn (more) about software development processes?
Java:Language, Process:UML, Process:Patterns, General:FAQs, Tools:Process
John Mitchell PREMIUM, May 30, 2001
Check out the jGuru Process FAQ.
What are Collaboration Patterns?
Process:Patterns
Kenneth Liu, Jan 17, 2001
Collaboration Patterns are repeatable techniques used by teams of people to help them work together (collaborate). Ellen Gottesdiener of EBG Consulting...
Are there any good Java-specific patterns books available?
Process:Patterns, Process:Patterns:Learning, Process:Patterns:Books
John Zukowski PREMIUM, Dec 21, 2000
The Java-specific patterns books are: Java Design Patterns: A Tutorial Patterns in Java, Volume 1 Patterns in Java, Volume 2 Concurrent Programming in...
What is TAO (The ACE ORB)?
Process:Patterns, Process:Patterns:BestPractices, Process:Patterns:Design
John Mitchell PREMIUM, Dec 19, 2000
TAO is The ACE ORB -- a CORBA ORB built using the ACE framework. TAO is an open-source, standards-based, middleware platform which targets real-time...
What is ACE (Adaptive Communication Environment)?
Process:Patterns, Process:Patterns:Learning, Process:Patterns:BestPractices, Process:Patterns:Design, Process:Patterns:Tools
John Mitchell PREMIUM, Dec 19, 2000
ACE is the ADAPTIVE Communication Environment. It is an open-source, OO framework designed and built implementing a good number of design patterns to...
What patterns are particularly useful in building networked applications?
Process:Patterns, Process:Patterns:Learning, Process:Patterns:BestPractices, Process:Patterns:Architecture, Process:Patterns:Design, Process:Patterns:Books
John Mitchell PREMIUM, Dec 19, 2000
I suggest starting with Pattern-Oriented Software Architecture: Patterns for Concurrent and Networked Objects (POSA2). POSA2 specifically brings together...
What are Anti-Patterns?
Process:Patterns, Process:Patterns:Anti
Joseph Shelby, Dec 18, 2000
There isn't really a "clean-cut" definition out there just yet, unlike Design Patterns. Basically, as Design Patterns (and more particularly,...
Where can I find good examples of the Prototype pattern?
Java:Language:Interfaces, Process:Patterns, Process:Patterns:Design
Scott Stanchfield, Nov 15, 2000
The prototype pattern is actually quite simple to implement in Java. Recall that the idea of prototype is that you are passed an object and use that object...
How and where did the concept of design patterns get started?
Process:Patterns
Rohith Ajjampur, Nov 6, 2000
Work on patterns has been influenced by the works of Christopher Alexander who published on topics related to urban planning and building architecture...
What are Process Patterns?
Process:Patterns
Mark Pollack, Oct 31, 2000
Basically process patterns define a collection of best practices, techniques, methods for developing object-oriented software.A good reference site is...
What is the Reactor pattern?
Process:Patterns
Mark Pollack, Oct 30, 2000
The new book "Pattern-oriented Software Architecture Volume 2" ISBN 0471606952 has a chapter on the Reactor pattern. It falls under the general...
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