ITEC 401402 Seminar

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ITEC 401-402 Seminar

• On UML Diagrams
• by Sensev Alicik

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What is UML?

• UML, short for Unified Modeling Language, is a
  set of modeling convention that is used to
  specify or describe a software system in terms of
  objects.
• There are a number of different UML diagrams that
  provides a look of the system from different
  perspectives.

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UML Diagrams

• Some of these diagrams we will learn about today
  are
• Use Case diagrams
• Use Case descriptions
• Class diagrams
• Activity diagrams
• Sequence diagrams
• Collaboration diagrams

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What are Use Case Diagrams?

• Use cases are descriptions of the functionality
  of the system from the users perspective.
• They show the functionality that the system will
  provide and show which users will communicate
  with which system functions.
• When developing a project the starting point
  should be creating your use cases, in other
  words, deciding on the system functions.

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Use Case Example

• Lets analyze a simple use case diagram created
  for a library system.

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Typical format of a Use Case Description
Author
Date
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Use Case Description for registering a user
Author
Date
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What are Class Diagrams?

• Class diagrams depict the systems object
  structure.
• They show the object classes that the system is
  composed of as well as the relationship between
  those object classes.
• Each class represents its own set of methods,
  operations and attributes.

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Class Diagram Example

• Lets analyze the simplest class diagram created
  for a library system.

can be borrowed
can borrow
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Activity Diagrams

• Activity diagrams can be used to model different
  aspects of the system.
• The common use of activity diagrams is modeling
  the system functions represented by a use case,
  possibly using object flows to show which objects
  are involved in the in a specific use case.
• In summary activity diagrams are used for the
  following purposes
• To model a task
• To describe a system function that is represented
  in the use case
• To describe the logic of an operation
• To model the activities that make up the
  lifecycle.

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Activity Diagrams

• Activity diagrams make it possible to represent
  the three structural components of all procedural
  programming languages sequences, selections and
  iterations.
• There are two-ways in which objects can be shown
  in activity diagrams
• the operation signature of an object can be shown
  as the name of an activity
• an object can be shown as providing the input to
  or output of an activity.

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Lets analyze one of the two versions of creating
activity diagrams by using the use case event
Borrow a book .
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Lets analyze the second version of creating an
activity diagram by using the same use case event
borrow a book.
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Collaboration and Sequence Diagrams

• Use case realizations are defined using
  interaction diagrams, of which are found in two
  types collaboration and sequence.
• Collaboration diagrams show classifier and
  association roles, and superimpose messages on
  association roles while sequence diagrams show
  classifier roles only, but make the sequencing of
  messaging very clear. One or the other form may
  be preferable.

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Collaboration and Sequence Diagrams

• As well as showing sequences of messages, both
  types of interaction diagrams can explicitly show
  the creation and deletion of objects, iterated
  and conditional message passing, and objects
  sending messages to themselves.
• The main difference between the two forms of
  diagrams is the way they show the order in which
  messages are sent.

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Example of Collaboration Diagramfor the use case
event borrow a book
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Example of Sequence Diagram for the use case
event borrow a book
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What Diagrams are Needed for ITEC401 Report ?

• General Use Case Diagram
• Partial Use Case Diagrams
• Use Case Realization
• Class Diagram
• Activity Diagram

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What Diagrams are Needed for ITEC402 Report ?

• General Use Case Diagram
• Partial Use Case Diagrams
• Use Case Realization
• Class Diagram
• Sequence/Collaboration Diagram

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What Diagrams are Needed for Multimedia Project
Reports ?

• General Use Case Diagram
• Partial Use Case Diagrams
• Use Case Realization
• Activity Diagram

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THE END

• Thank You For Your Attention !!!

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• Get Appointment From
• sensev.alicik_at_emu.edu.tr