In the vehicle’s example, Car is also a subclass of the Vehicle class, which means a car instance can inherit methods and properties from both: Terrestrial and Vehicle classes. The statement above means that if we add a class C to extend from the previous class B - the one that extends A - then class C also extends, by transitivity, from class A. Inheritance follows the transitivity property When class B extends class A, we say that B is a subclass of A, and at the same time, A is a superclass or base class of B.įollowing the example, Car is a subclass of Terrestrial, but here is a thing about class inheritance: Each time we model a class that inherits from another, we extend the functionality to add more specialization. It’s a rule in inheritance we always go from the most general form to the detailed one.

The diagram goes from top to bottom, describing what a Car means from general to specific. But it isn’t necessary for this example so we can avoid adding much complexity to the problem. We could distinguish them using other classifications like the displacement mechanism, for example, for terrestrial vehicles: wheels or tracks.

In the image above, we classify the vehicles by the environment they were designed for: Terrestrial for ground vehicles such as cars, trucks, motorcycles Aerial for planes, jets, helicopters, and aquatic for boats, yacht, and submarines.

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