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Interface Design by Bill Venners
Use abstract classes to provide default behavior or define a small family


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Abstract Classes

Figure 3-?. Inheritance and the state pattern.

It's really a tight-knit family thing. In the Java programming language, people can always use inner classes, which is a short hand of using composition, to get around multiple inheritance of implementation. If it feels more like a small family, go for the abstract class.

You force Canines into the Canine inheritance hierarchy. You limit client choices. What you are saying is that class Canine is a more narrow idea than interface Canine. If you use an abstract class, you are saying the concept is much more narrow, an interface, much more broad.

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