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Object Oriented Design - CU-Boulder Computer Science

OO Design1 Object OrientedDesignKenneth M. AndersonLecture 20 CSCI 5828: Foundations ofSoftware EngineeringOO Design2 Object - Oriented Design Traditional procedural systems separate data andprocedures, and model these separately Object orientation combines data and methodstogether into a cohesive whole data abstraction The purpose of Object - Oriented (OO) Design is todefine the classes (and their relationships) that areneeded to build a system that meets therequirements contained in the SRSOO Design3OO A&D OO techniques can be used in analysis(requirements) as well as Design The methods and notations are similar In OO analysis we model the problem domain, whilein OO Design we model the solution domain Often structures created during OO analysis aresubsumed (reused, extended) in the structuresproduced by OO Design The line between OO analysis and OO Design is blurry, asanalysis structures will transition into model elements of thetarget systemOO Design4 Relationship of OO A&DOO Design5OO Concepts Encapsulation grouping of related ideas into one unit which wecan refer to by a single name For example, methods, classes, packages Provides information hiding by restricting theexternal visibility of a unit s information In OO A&D, the Object is

OO Design 38 Collaboration diagram Also shows how objects interact Instead of a timeline, the diagram shows the instantiation of associations between classes at run-time The ordering of a set of messages is captured by numbering them

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