Object Oriented Design and Programming

Object Oriented Design and Programming

Alan GoudeEmail: [email protected]

Room: Sheaf 4320

Unit delivery and assessment

Semester 1 – 6 x 2hr lectures, 12 x 2hr labs and one assignment given.

Semester 2 – 6 x 2hr lectures, 12 x 2hr labs and one assignment.

Topics - Semester 1

The object oriented approach OOA,OOD and OOP C++ Stream Input/Output Reference variables Classes

– Terminology– Class members – data and functions(methods)– Class access – public, private & protected– Separation of interface from implementation– Constructor and destructors– function overloading

Dynamic memory allocation Object aggregation and composition UML notation for classes and class aggregation.

Topics - Semester 2

Operator overloading Additional class features

– Friend functions– Static members

Inheritance Polymorphism Abstract classes, Virtual functions More UML - Class diagrams Templates (time permitting)

Books

Thinking in C++ by Bruce Eckel– Vol.1 (basics) and Vol.2 (advance features)– Assumes knowledge of ‘C’– Free Electronic versions available from-

http://www.mindview.net/Books

C++ : How to program by Deitel & Deitel– See info at http://www.deitel.com/– Fourth Edition available Oct 2002– Includes a version of Microsoft Visual C++

Other books and information sources

Object-Oriented Analysis and Design with Applications by Grady Booch

Unified Modelling Language User Guide by Grady Booch, Ivar Jacobson, James Rumbaugh

UML Distilled: A Brief Guide to the Standard Object Modeling Language (2nd Edition) by Martin Fowler, Kendall Scott

My Web page - http://www.shu.ac.uk/schools/eng/teaching/ag

Try a www.google.com search

Object Oriented Design and Programming

OOD – Major proponents and developers– Grady Booch, Ivar Jacobson, and James

Rumbaugh– Unified Modelling Language (UML)

OOP – Several OOP languages– Smalltalk, Eiffel. Pure OOPL– C++, Java. Said to be object based OOPL

Software Tools

Object Oriented Programming (OOP)– C++– Using Microsoft Visual C++ compiler

Object Oriented Design (OOD)– UML (Unified Modelling Language)– Rational Rose UML visual modelling tool

Object Model

Key ideas Abstraction Encapsulation Modularity Hierarchy

Minor elements of the object model– Typing (language dependent – data typing)– Concurrency (OS dependent)– Persistence

Abstraction

Helps to deal with complexity by focusing on certain features and suppressing others.

Focus on interface (outside view)

Separate behaviour from implementation

Hierarchy

A way of ordering abstractions

Object hierarchical abstractions (“HAS A” or “PART OF” relationship)

Interfaces and behaviours at each level

Higher levels are more abstract

Encapsulation

Also known as information hiding

Hides the details of the implementation

Complementary to abstraction

Abstraction, Encapsulation and Software Design

Interface should be simple, providing the required behaviour.

User is presented with high level abstract view. The detail of the implementation is hidden from the user.

The designer may change the implementation keeping the interface the same.

Modularity

A common “Divide and conquer” approach

Partitions a problem into sub-problems reducing complexity

Modularity packages abstractions into discrete units

In C++ classes are the basic modules providing encapsulation and abstraction

Re-usability - Inheritance

Class Hierarchies Derived class inherits

properties and behaviour of a base class

Allows code re-use. Derived classes can

have – additional properties

and behaviour,– or over-ride inherited

behaviour.