Donald Fowler

As it turns out, designing and implementing this wizard framework exposes many of the real-world design and programming issues we face when creating Java applications. Overview The first step in designing our wizard class is to come up with an interface. An interface is a prototype for a class in which we describe the class' functionality without getting into implementation details. When designing an interface, think about how someone would use the class and jot down some pseudo-code. Translate these ideas into member functions to create the interface. One thing to remember is that the initial pass at an interface will rarely be the last. You will probably end up modifying and improving the interface several times during the course of development. Since there are several different ways we could go about designing our wizard interface and corresponding implementation... (more)