How implement an abstract class?

[Antonio Santiago <antonio leaderbrokers com>]

Hello,

I want to implement an abstract class with their own attributs that inherit all her subclasses, and her own methods, some implemented and somo not).

Vehicle <----- Car

If I create a class Vehicle and a class Car, there is nothing to avoid someone create a simple Vehicle's object, and then I would have an instance of an abstract class.

Some ideas.

Thanks.