Object Orientation

• In recent times, object oriented software development has become the method of choice
• When a system is represented as a set of objects
• These objects can be easily expanded to add to system functionality or new objects can be developed and plugged into the system
• New systems can use components previously developed to reduce their development time
• This contrasts with structured software development where such extensible and reuse is not as easy
• Object Oriented Concepts
• In order to be able to effectively design object oriented computer programs a number of key concepts need to be understood
• Abstraction
• Encapsulation
• Inheritance
• Polymorphism
• Message Sending
• Associations
• Aggregation