Unified Modeling Language

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Unified Modeling Language

• Philip Liew
• pliew_at_uwaterloo.ca

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UML Overview

• Standard defined by Object Management Group
  (www.omg.org)
• Current version at 1.5

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Class Diagrams

• Class diagrams consist of several classes
  connected with relationships
• Representation of a class

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Class Diagram
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Convention

• Name of class is a word with initial upper case
  letter
• Capitalize first letter of every word in name
• Name of attributes is lower case letter
• Capitalize first letter of every word other than
  first
• Operations have same naming schemes as attributes
• Brackets include parameter operation works on

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Deriving Classes

• Nouns within requirement become classes
• Verbs become operations
• Nouns related to class nouns will become
  attributes

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Associations

• In the form of a line between two objects
• Name of association just above line
• Role presented next to class near association
• Dashed line represents constraint

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Associations

• Multiplicity represents number of objects from
  one class that relate with a number of objects in
  an associated class

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Inheritance Generalization

• Represented by a triangle
• Abstract class indicated by italics

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Aggregation

• Components and Class represent a part-whole
  relationship
• Composite is a strong form of aggregation
• Components in a composite can be part of only one
  whole

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Class Visibility

• Attributes and operations have three levels of
  visibility
• Public Level usability extends to other classes
  ()
• Protected Level usability open only to inherited
  classes ()
• Private Level Only original class can use
  attribute or operation (-)

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Example

• Suppose that you're writing a document in
  Microsoft Word for example. You can start typing
  a new document, or open an existing one. You type
  a text by using your keyboard.
• Every document consists of several pages, and
  every page consists of header, document's body
  or/and footer. In header and footer you may add
  date, time, page number, file location e.t.c.
• Document's body has sentences. Sentences are made
  up of words and punctual signs. Words consists of
  letters, numbers and/or special characters. Also
  in the text you may insert pictures and tables.
  Table consists of rows and columns. Every cell
  from table may hold up text or pictures.
• After finishing the document, user can choose to
  save or to print the document.

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Nouns

• document, text processing tool, MicrosoftWord,
  text, keyboard, header, footer, document's body,
  date, time, page number, location of file, page,
  sentence, word, punctual sign, letter, number,
  special character, picture, table, row, column,
  cell, user

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Document Class

• Every Document consists of pages
• Page is a candidate for class

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Header and Footer
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Text, Table, and Picture
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Finally