Object-oriented Design Ontology - The Building-blocks of Object-oriented Design

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')

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