Object Oriented Programming

Data and Methods live together

Class

Objects with certain characteristics live together

OO Benefits most often claimed

Faster application development at a lower cost Decreased maintenance time Less complicated and faster customizsation of programs Higher quality code

Additional claimed benefits

Enables the development of a common GUI across all platforms Handles the storage and manipulation of more complex data types. Provides the infrastructure for distrubuted applications

What is OO Programming

OOP is a set of implementation techniques that can be done in any programming language and are very difficult to do in most programming languages

General Agreement on OOP

Strongly reflects software engineering ... information hiding and abstract data types Better vehicle for reusing code Produces more mailleable systems Keeps the programmer in touch with the problem

Some people say ....

Demise of waterfall development. Don't bother unless you have an OO language for final implementation You can design and implement deep systems. I'll never go back to conventional programing.

Workinng definitions

Object based - Objects only Class based - Objects and Classes Object oriented - Objects, Classes and Inheritance

3 ways to think of an object

The state of memory is accessible through the operations and only through the operations Objects hava an inside and an outside Personified data, antropomorphism, little people

Can these be objects

a bank account a stack an ADA package a fraction

Why an object based view

Objects may resemble real world conterparts People often think first of a thing, then what it can do. Encapsulation facilitates enhancement

Classes are factories for new objects

Whale BankAccount DialogBox