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Ryerson University
Information Technology Management
ITM 305
Youcef Derbal

Week5-chapter 5- Structural modeling Goal-to write on or more collections of data processing computer instructions (computer programs)which, upon execution, would either support the realization or realize a human recognizable function such as sending an email message, adisplaying a picture on a screen or withdrawing money from an automatic teller machine. Object orientation- Softwware design approach that relies on the conception of “abstract programming entities” called objects that are given the responsibility of realizing through collaborations the behaviour specified by the use case model. Objects,classes and attributes- An object is a person, thing or an event.(john, square, johns graduation) We define a class as an abstract entity that represents a group of objects.(eyes nose, legs, for people) Attribute: holds the object data. It has a name, type, and a value Operation:something an object can do Associations in UML: -defines a structural relationship that captures the possibility of navigating from one object to the next and vice versa(both can establish communication) -the multiplicity(the name sometimes) – practically feasible to show. Aggregation and composition- -------it is a whole-part association -the part may exist independently of the aggregate -the part can be associated with other aggregates(student is part of two different languages)---- ------it is a strong aggregation -the part can be associated with one and only one aggregate(called composite in this case) -the lifecycle of the part is dependant on thatof the composite -if the composite is destroyed the part will be destroyed------- GENERALIZATION- -it is an “is-a-kind-of” relationship -a relationship between a super
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