Concepts of Object Oriented Design

COMP201 Lectures 2021-11-13

This lecture is basically a copy of some COMP122 lectures. For more information on any topic, click on the link below:

• General OOP concepts - Introduction to OOP
• Objects
• Classes
• Constructors
• Encapsulation

• Inheritance - Subclasses

  Dynamic binding is where you write:

    B temp = new C();
  

  This is where we use the methods from $C$ on an object of type $B$. It is called up-casting.

• Polymorphism
• Method Overriding
• Interfaces

Summary

• Objects can have their own private state and operations.
• Objects should have a constructor as well as inspection operations. They provide services to other objects.
• Objects may be implemented sequentially or concurrently.
• Object interfaces should be defined precisely using, ideally using an object oriented language.
• Object-oriented design potentially simplifies system evolution.
• The Unified Modelling Language provides different notations for defining different object models.