Lecture 4

What is Object Oriented Programming? ,[object Object],[object Object],[object Object],[object Object],[object Object]

The two steps of Object Oriented Programming ,[object Object],[object Object]

Example: The Creature class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Example: The Creature class ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Note that unless the methods are very short, declaration and implementation is usually separated. The declaration goes into a header file (.h), the implementation in a .cpp file.

Classes & Objects ,[object Object],[object Object],So a class is a blueprint for objects

Objects & Classes ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Instantiating Objects ,[object Object],[object Object],[object Object],[object Object],Declaring z of type ‘creature’ means we have generated an object with the attributes and methods of the class.

Multiple Objects ,[object Object],[object Object],[object Object],[object Object],Creates three objects.

Sending Messages / Calling Methods. ,[object Object],[object Object],[object Object],[object Object],Messages are sent to my dog and the milkman.

Back to the Instantiation... ,[object Object],[object Object],[object Object],[object Object],Here the “default constructor” of the Creature class is automatically called. If we don’t like this we can specify constructors explicitly!

Lecture 4

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Lecture 4