Derived Classes

I. Introduction
● Derived classes
- A mechanism for expressing among classes.

- A simple, flexible, and efficient mechanism for defining a class
by adding facilities to an existing class without
or recompilation. ==>

- Hierarchical relationship ： inheritance

- Class types can inherit characteristics from simpler, more general types.

- If a class D inherits from class B, we say that
D is the class and B is the class．

● OOP is the process of building class hierarchies.

How is it to the others of its general class ?
How is it ?

- The levels are the most general.
Each level is more specific than the one before it, and less general.

II. Derived Classes

2.1 Concepts

● ` but different` situation

…(생략)