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
May 12, 2008, 2:15 pm
M206 Computing: An Object-oriented Approach
What is an Object?
It must be emphasised that M206 is not a programming course, although it employs a considerable amount of programming using the Smalltalk language. M206 teaches a range of concepts that underpin Object-oriented computing, also referred to as either Object technology, the Object paradigm, or OOP. I think it is important to concentrate on these key concepts, since initially they are sometimes difficult to understand.
Adopting this paradigm, we can view a computer system as comprising of
software components called objects.
An object is a piece of software that has a unique identity, possesses
memory and has a capacity to carry out some particular task in response
to receiving a specified message.
A "rountangle" is used to schematically represent an object. You will be asked to produce diagrams for your TMAs, using Word. You can download instructions for using Word's Drawing tools here.
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