Object-Oriented Design with ABAP: A Practical Approach

© James E. McDonough 2017

James E. McDonough, Object-Oriented Design with ABAP, 10.1007/978-1-4842-2838-8_5

5. Inheritance

James E. McDonough¹ 

(1)Pennington, New Jersey, USA

The next stop on our journey to Objectropolis takes us from Abstraction to a place called Inheritance.

Let’s return to Table 4-3 (from the previous chapter) to describe the relationship between the abstraction levels for Enclosed shape, Enclosed shape with at least one angle, and Rectangle, shown again here in Table 5-1.

Table 5-1. Summary of the Members of the Three Classes

Classes	Enclosed shape	Enclosed shape with at least one angle	Rectangle
Attributes	area perimeter	area perimeter smallest angle	area perimeter smallest angle hypotenuse
Behaviors	getArea getPerimeter	getArea getPerimeter ...