When you are considering using inheritance, ask yourself whether the subclass really is a more specialized version of the superclass ... Now let’s try the same example using composition ...

Imagine you are an expert object-oriented Java ... for example, you could introduce a Factory class to generate transaction objects -- this adds complexity and could become a maintenance burden.

At JavaZone 2010 I will be giving a lightning talk on APIs that use dynamic subclasses. These APIs make it possible to do things in Java that seem ... Let’s look at an example: Finding the ...