Apple Certification Exam 9L0-509

Inheritance is typically expressed by describing classes of objects arranged in an inheritance hierarchy 9L0-509 reflecting common behavior.

For example, one might create a variable class "Mammal" with features such as eating, reproducing, etc.; then define a subtype "Cat" that inherits those features without having to explicitly Pass4sure 9L0-402 program them, while adding new features like "chasing mice". This allows commonalities among different kinds of objects to be expressed once and reused multiple times.

In C++ we can then have classes which are related to other classes (a class can be defined by means of an older, pre-existing, class ). This leads to a situation in which a new class 9L0-509 has all the functionality of the older class, and additionally introduces its own specific functionality. Instead of composition, where a given class contains another class, we mean here derivation, where a given class is another class.

This OOP property will be explained further when we talk about Classes (and Structures) inheritance in the of the book.

If one wants to 9L0-402 Exam use more than one totally orthogonal hierarchy simultaneously, such as allowing "Cat" to inherit from "Cartoon character" and "Pet" as well as "Mammal" we are using multiple inheritance.