Simple UML

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Simple UML
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What is UML?

• UML stands for Unified Modeling Language
• UML is a diagramming language designed for
  Object-Oriented programming
• UML can be used to describe
• the organization of a program
• how a program executes
• how a program is used
• how a program is deployed over a network
• and more

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Design Patterns

• Design Patterns describe the higher-level
  organization of solutions to common problems
• Design Patterns are a current hot topic in O-O
  design
• UML is always used for Design Patterns
• Design Patterns are used to describe refactorings
• We will discuss some Design Patterns later on in
  this course

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UML is complex

• UML is a big, complicated diagramming language
• UML comprises at least seven or eight different
  kinds of diagrams
• This talk will cover just a tiny bit of one kind
  of diagram, the class diagram
• A class diagram is often all that is needed to
  describe a particular Design Pattern

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Class diagrams

• A class diagram shows classes, interfaces, and
  their relationships
• Well cover most of classes and interfaces, and a
  few of the most important relationships

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Classes

• A class is drawn as a rectangle with two or three
  compartments

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Variables I

• A variable is written as
  visibility name typewhere
• means public visibility
• means protected visibility
• - means private visibility
• ltblankgt means default (package) visibility
• Example lengthint

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Variables II

• Static variables are underlined
• An initial value can be shown with value
• Example -numberOfEmployeesint10means
  numberOfEmployees is
• private
• static
• integer
• and has 10 as its initial value

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Methods

• Methods are written as visibility name
  (parameters) returnTypewhere
• visibility uses the same syntax variables (, -,
  , blank)
• parameters are given as nametype
• if the returnType is void, it is omitted
• constructors are preceded by constructor
• interfaces are preceded by interface
• an ellipsis () indicates omitted methods

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Example of a class
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Types of relationships
Class Bextendsclass A
Class Ccontains 1 to 4 objectsof class D
Other kinds ofrelations
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Example Secret Code program
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UML tools

• Rational Rose is the real world standard full
  round-trip code generation
• Recently acquired by IBM (right under Microsofts
  nose!)
• Together (from Borland) is a lot like Rational
  Rose
• I havent used it in about three years (since
  before Borland bought it from TogetherSoft)
• ArgoUML looks interesting (and is open source)
• BlueJ, of course, displays simple UML diagrams
• Drawing programs with UML support
• Visio is a Microsoft tool
• Dia is a freeware clone of Visio

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Tool links

• Rational Rose
• http//www-3.ibm.com/software/awdtools/developer/r
  osexde/
• Together
• http//www.borland.com/together/
• ArgoUML
• http//argouml.tigris.org
• Visio
• Hard to find info on Microsofts site!
• http//msdn.microsoft.com/office/understanding/vis
  io/
• Dia
• http//www.lysator.liu.se/alla/dia

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The End