Answered: Let’s consider a superclass Vehicle.…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Let’s consider a superclass Vehicle. Different vehicles have different features and properties however there few of them are common to all. Speed, color, fuel used, size are few which are common to all. Hence we can create a class ‘Vehicle’ with states and actions that are common to all vehicles. The subclass of this superclass can be any type of vehicle. Example: Class Car A has all the features of a vehicle. But it has its own attributes which makes it different from other subclasses. By using inheritance we need not rewrite the code that we’ve already used with the Vehicle. The subclass can also be extended. We can make a class ‘Sports Car’ which extends ‘Car’. It inherits the features of both ‘Vehicle’ and ‘Car’.

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