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  Tutorial: Enforce strict type safety with generics

Java generics are the exciting new feature of Java 5 (renamed from J2SE 1.5) due for release shortly. Much controversy surrounds generics. In fact, Sam Pullara suggests that generics are just a really complicated way of implementing autocasting.

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In this article, Conan Dalton attempts to present one of the bright sides of generics: the ability to enforce stricter type safetyâ??in particular, a kind of type safety that can not be achieved with autocasting. Dalton uses a simple but reusable event-dispatching mechanism for an example and compares a generics-aware implementation with a non-generics-aware implementation. He explains some of the more obtuse elements of the new Java syntax and, in conclusion, suggests that generics may have a different impact depending on whether you are an API client or an API developer.

Event-driven design has been around for quite some time. Within Java, both AWT (Abstract Window Toolkit) and Swing are based on an event model. Java provides the classes EventQueue, AWTEvent, AWTEventMultiCaster, and EventListener in the java.awt package. However, because I wanted to use events generally and not merely in the context of graphical UI operations, I ended up writing a simple dispatcher of my own. In this article, I present the pre-generics version of this dispatcher and show how the introduction of generics improved the mechanism's usability.


 

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Enforce strict type safety with generics

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