Unified Modeling Language Presentation

Unified Modeling Language Presentation

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What is UML (slide 1)
Unified Modeling Language is a language for the designing an object oriented system.
UML was meant to be a unifying language enabling IT professionals to model computer applications.
UML notation set is a language and not a methodology. This is important, because a language, as opposed to a methodology, can easily fit into any company's way of conducting business without requiring change.
It is means for Technical architects to communicate with developers.
UML provides several types of diagrams that increase the ease of understanding an application under development.
By using standard UML diagrams in your work you make it easier for UML-proficient people to join your project and quickly become productive.
UML Consists of 9 diagram models containing both Static and Dynamic models.
• Some of which are:
o Activity Diagram
o Uses Cases Diagram
o Sequence Diagrams
o And Class Diagram
In actuality there is more to UML than diagrams, but for my purposes of this presentation I will be focusing only on the Class Diagram.

Class diagram (slide 2)
A Class
o Can be considered prototypes when creating objects.
o Is used to define the static structure of a project
o Most diagrams will contain multiple classes
o Interaction between classes dictates the definition of a system
o Represents the projects blue print

The class diagram shows how the different entities (people, things, and data) relate to each other; in other words, it shows the static structures of the system.
A class diagram can be used to display logical classes, which are typically the kinds of things the business people in an organization talk about — rock bands, CDs, radio play; or loans, home mortgages, car loans, and interest rates.
Class diagrams can also be used to show implementation classes, which are the things that programmers typically deal with. An implementation class diagram will probably show some of the same classes as the logical classes diagram. However it will not be drawn with the same attributes.

A class is depicted on the class diagram as a rectangle with three horizontal sections, as shown in the Figure.
The upper section shows the class's name; the middle section contains the class's attributes they can be considered data definition ; and the lower section contains the class's operations or "methods" they are the action on Attributes.
Visibility Control
o + Indicates data is public
 Any client creating class object can access
o # Indicates data is protected
 Can only be viewed in the inheritance chain
o – Indicates data is private
 Not viewable by clients
Class Diagram Relationships (slide 3)
• Links are Basic relationships between objects

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o Associations represent a Binary family of links, of which there are 4 type bi-directional, uni-directional, Aggregation and Reflexive. With Bi-directional and uni-directional being the most common.
 Aggregations are more specific that association but are non-vital which means it can be destroyed and the class could remain. Such as a park and people. If the Park is destroyed the people still exist.
 Compositions are even more specific than aggregations and are vital to the diagram. If a composition is destroyed than the whole diagram is affected. For example if that same park is destroyed than all the trees in it would be as well.
• Class level
o A Generalization means that a subclass is considered to be a specialized version of the super class like in the following figure. The Preferred Customer is a specialized version of customer
o A Realization is when one component realizes the command of another component. In other words, the client executes the behavior specified by the supplier.
• General
o A Dependency is a weaker pond where as the name implies one class is dependent on another class. The dependent class wait for the independent class to initiate the action

Class Diagram Relationships (slide 4)
Most diagrams will contain multiple classes an example would be a Product Order Class interacting with Order Payment Class
For a class diagram like this one, you should draw the inheritance relationship using a line with an arrowhead at the top pointing to the super class, and the arrowhead should be a completed triangle.
An association relationship should be a solid line if both classes are aware of each other and a line with an open arrowhead if the association is known by only one of the classes.

There are several software tools that help you to integrate UML diagrams into your software development process, but even without automated tools, you can use markers on a whiteboard or paper and pencils to draw your UML diagrams and still achieve benefits.

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