The Building-blocks of Object-oriented Design
According to A Theory of Object-Oriented Design, the rudiments ('building-blocks') in the ontology of object-oriented design are as follows:
Individual entities:
- Classes
- Methods
Higher-dimensional entities
- Uniform sets of entities (sets of classes, sets of methods)
- Uniform sets of uniform sets (sets of sets of classes, sets of sets of methods)
- Class hierarchies (sets of classes such that all inherit from one)
Relations:
- Simple relations ('method m1 calls method m2', 'class subcls inherits from class supercls')
- Total relations ('all the concrete collections inherit from the Collection interface')
- Isomorphic relations ('each factory method creates and returns instances of a distinct product class')
Read more about this topic: Object-oriented Design Ontology
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