Object-oriented analysis & design 1. Introduction Object-oriented analysis & design

Objectives Compare analysis versus design Define object-oriented analysis & design Illustrate with a brief example

Applying UML & Patterns in OOA/D An object system design is good when it: Each object’s function is clear Object interactions are clear Functions correctly Is easy to modify (simple as possible?) Performs well.

Applying UML & Patterns in OOA/D UML stands for Unified Modeling Language. UML is only a notation used to: Explore an object design space Express/communicate a design

Applying UML & Patterns in OOA/D Assigning responsibilities to objects is fundamental to design. Such assignments benefit from principles & heuristics. The principles & heuristics depend on the object domain. Do the principles of assigning responsibilities to software objects apply to meatware objects? Should you use these principles to assign responsibilities to team members?

What Is Analysis & Design A resolution of anything, whether an object of the senses or of the intellect, into its constituent or original elements; an examination of the component parts of a subject, each separately, as the words which compose a sentence, the tones of a tune, or the simple propositions which enter into an argument. Synthesis Composition, or the putting of 2 or more things together, as in compounding medicines.

What Is Analysis & Design To draw preliminary outline or main features of; to sketch for a pattern or model; to delineate; to trace out; to draw. To create or produce, as a work of art; to form a plan or scheme of; to form in idea; to invent; to project; to lay out in the mind; as, a man designs an essay, a poem, a statue, or a cathedral.

What is Object-Oriented Analysis OOA A resolution of a system into its constituent objects or concepts. OOD To invent a model delineating the key objects of a system that satisfies a set of requirements.

What is Object-Oriented Analysis A key object or concept has representations Domain concept Visualization of concept Programming language representation Book title public class book { private String title; public Chapter getChapter(); }

What is Object-Oriented Analysis Object/concept representations Domain concept Visualization of concept Programming language representation Book title public class book { private String title; public Chapter getChapter(); }

An Example Mandelbrot Set Visualizer Define use cases 1. Visualize Mandelbrot Set: User selects a region to visualize. User sets visualization parameters. System displays selected region accordingly.

An Example Define a domain model MandelbrotSet region notifies Visualizer sets Region, parameters Controller Domain model indicates key concepts, associations, & attributes.

An Example Define Interaction Diagrams :Controller MandelbrotSet Visualizer setRegion() setRegion( Region) notify()

An Example Define Class Diagrams Visualizer Controller MandelbrotSet region: Region viewer: Viewer setRegion() setIterationLimit() Visualizer set: MandelBrotSet notify() Controller set: MandelBrotSet setRegion()