John McSweeney
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OU Courses
Basic Smalltalk
- What is an object?
- Object protocol
- Objects and encapsulation
- Encapsulation continued
- Abstraction
- Reuse
- Object attributes
- The concept of class
- Class hierarchy and inheritance
- Variables
- Messages
- Assignment
- Methods
- Accessor messages
- Guide to using accessors
- The Artwork class
- The protocol of Artwork and its subclasses
- The instance methods of Artwork
- self
- Class methods
- Variable-reference diagrams
- Assignment exercise
- Object-interaction diagrams
- Textual representation (print-strings)
- Precedence rules
- The Dialog class
- Blocks
- Branching
- Boolean messages
- Conclusion
Miscellaneous
- Links
- FAQ
- An essay on frogs and toads.
- Drawing with Word (Word doc 381Kb)
- Learning Works - Hints and tips (Word doc 35Kb)
- Basic Smalltalk (pdf 50Kb)
- M206 Smalltalk Hierarchy Diagram (Word doc 38Kb)
- Smalltalk Syntax
- Smalltalk Traps and Bugs (Word doc 71Kb)
Smalltalk Exercises
February 5, 2012, 4:11 am
M206 Computing: An Object-oriented Approach
Class
I wrote earlier that it is sometimes difficult to think of objects that do not have a tangible equivalent. However, one concept that is easier to grasp is that of classification, the idea that we can groups things that are similar, possessing similar properties.
OOP uses the concept of class to manufacture objects that are similar. A class is the template for the production of objects. Objects that belong to the same class will have the same attributes and possess the same protocol, which means that objects of the same class will respond to the same set of messages.
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