O’Reilly: Inside RIA

The goal of this article is to help you gain a better understanding of the Decorator design pattern. The Decorator pattern is used to attach additional responsibilities to an object at run time dynamically. Decorators provide a flexible alternative to subclassing to extend the functionality of classes in a hierarchical relationship. The Decorator design pattern utilizes an important OOP concept known as the open closed principal. This means that classes are open to extension but closed for modification. The Decorator pattern also uses the concept of composition, another very powerful OOP concept.

The goal of this article is to help you gain a better understanding of the stimulating new features and improvements that will be available in Flex 4, code named “Gumbo.”  Exciting changes are being made to the Flex framework that: enable sophisticated and powerful skinning capabilities, increase productivity for developers and harness the myriad of new features available in Flash Player 10. Example source code is included with the article to demonstrate the new skinning features coming in Flex 4.

A homework assignment I was recently given for a Java programming class involved a competition to see who could create the most optimized implementation of an interface which was provided by the instructor. It was a challenging and very fun assignment that I think the whole class enjoyed. I didn’t win the competition but still came out a winner because of my heightened interest in application optimization and performance tuning that I gained.

The goal of this article is to help you gain a better understanding of the Strategy design pattern. The Strategy pattern is used to separate the areas of an application that differ from the areas of an application that remain the same. This design pattern sits on top of several fundamental OOP principals. For example the Strategy pattern uses the concept of programming to an interface rather than an implementation. Strategy also favors composition over inheritance. The reason you would use the Strategy pattern is to abstract an algorithm from a class and create a new class based on the algorithm. Using polymorphism the algorithms can be changed at runtime by the compositing class.