Re: Appearance Pattern - ok, is there a better explanation, a tutorial, a step-by-step?

Hey, that's what static typing is for:

• if you're implementing an interface, you know which methods you have to implement, and it won't compile without them.
  
• if you're writing your own interface, you're necessarily also writing the code that calls the methods, so you're responsible for defining the methods, their name, their parameters, etc.

If you want a concrete example, have a look at http://code.google.com/p/google-web-toolkit/source/browse/trunk/user/src/com/google/gwt/widget/client/TextButton.java the only existing Cell-backed widget for now.

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