SWE 3633 Lecture Notes - Lecture 26: Abstract Type, Subtyping, High-Level Design
20 Mar 2017
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Static descriptions (design: classes, associations among classes, generalization and inheritance ( is a relationship, aggregation ( part-whole relationship) &composition. Generalization is a parent-child or sub-typing relation between classes: e. g. dog is a animal. A person works for a company; company has a number of buildings. Interfaces are important in design because it shows the relationship of dependencies (of features - attributes or/and operations) Composition is a special kind of aggregation where the part may only belong to one whole at any time. Transitivity property: person z is biologically-related to father y; father y is biologically related to family x. The person z is biologically related to the family x. (this is a transitive relationship --- thus an aggregation: joe is a member of a church y; church y is a member of entities that don"t pay taxes. Joe pays taxes! (be careful with is a member of versus possess the characteristics of )
