uml

1. Simple UML
May 12, 2012

2. 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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3. 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 may discuss some Design Patterns later on in this
course
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4. 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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5. Class diagrams
 A class diagram shows classes, interfaces, and their
relationships
 We’ll cover most of classes and interfaces, and a few
of the most important relationships
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6. Classes
 A class is drawn as a rectangle with two or three
compartments:
Name of the class
Variables [optional]
Methods
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7. Variables I
 A variable is written as:
visibility name : type
where:
 + means public visibility
 # means protected visibility
 - means private visibility
 <blank> means default (package) visibility
 Example: +length:int
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8. Variables II
 Static variables are underlined
 An initial value can be shown with =value
 Example:
-numberOfEmployees:int=10
means numberOfEmployees is:
 private
 static
 integer
 and has 10 as its initial value
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9. Methods
 Methods are written as:
visibility name (parameters) : returnType
where
 visibility uses the same syntax variables (+, -, #, blank)
 parameters are given as name:type
 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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10. Example of a class
Card
cardId:int
-copy:boolean=false
«constructor» Card(int id)
+isKind(desiredKind:int)
+isSharable():boolean
+toString():String
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11. Types of relationships
A C Factory
creates
1..4
B D Product
Class B Class C Other
extends contains kinds of
class A 1 to 4 objects relations
of class D
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12. Example: Secret Code program
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13. UML tools
 Rational Rose is the “real world” standard; full round-
trip code generation
 Recently acquired by IBM (right under Microsoft’s nose!)
 Together (from Borland) is a lot like Rational Rose
 I haven’t used it in about five 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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14. Tool links
 Rational Rose
 http://www-3.ibm.com/software/awdtools/developer/rosexde/
 Together
 http://www.borland.com/together/
 ArgoUML
 http://argouml.tigris.org
 Visio
 Hard to find info on Microsoft’s site!
 http://msdn.microsoft.com/office/understanding/visio/
 Dia
 hhttp://www.gnome.org/projects/dia/
 OmniGraffle 3 (Mac OS X)
 http://www.omnigroup.com/applications/omnigraffle/
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15. The End
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