Css uml

Computer System Software
Unified Modeling Language
Suman Aggarwal
A.P in CSE Deptt.
www.advanced.edu.in

Unified Modeling Language
UML is a standard language for specifying, visualizing,
constructing and documenting the artifacts of software
systems.
UML was created by Object Management Group (OMG).
UML provides an overview of the most important
diagrams used in the visual modeling of computing
programs.
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Features of UML
1. UML visually showing the overall architecture of the
system.
2. UML showing the same system from different points of
view (abstraction).
3. A standard graphical set of shapes representing generic
objects within a system.
4. A way of defining functions / methods that can change
the state of each object.
5. A way of showing how the objects interact with one
another.
6. Making it possible to generate code directly from an
UML diagram.
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Class Diagram
The class diagram shows a collection of classes, interfaces,
associations, collaborations and constraints. It is also known
as a structural diagram.
Class Diagram includes:
Analysis and design of the static view of an application.
Describe responsibilities of a system.
Base for component and deployment diagrams.
Forward and reverse engineering.
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Class Diagram
A Class Diagram is a diagram describing the structure of a
system
 shows the system's
classes
Attributes(Status)
operations (or methods),(Behavior)
Relationships among the classes.
Associations
Generalization
Realization
Dependency
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Class
A Class Diagram is a diagram describing the structure of
a system
Class NameClass Name
attributesattributes
operationsoperations
The name of the class is the only required
tag in the graphical representation of a
class. It always appears in the top-most
compartment.
An attribute is a named property of a
class that describes the object being modeled.
In the class diagram, attributes appear in
the second compartment just below the
name-compartment.
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Class Operations
person
name :
String
address :
Address
birth date :
Eat ()
Sleep ()
Play ()
Work ()
Operations describe the class behavior
and appear in the third compartment.
Attributes and operations may
have their visibility marked:
"+" for public
"#" for protected
"−" for private
"~" for package
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Associations
An association between two classes indicates that objects at one end
of an association “recognize” objects at the other end and may send
messages to them.
Example: “A Faculty works for an Institution”
Faculty Institution
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Associations (cont.)
•To clarify its meaning, an association may be
named.
•The name is represented as a label placed
midway along the association line.
•A role is an end of an association where it
connects to a class.
•May be named to indicate the role played by the
class attached to the end of the association path.
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Associations (cont.)
Multiplicity
The number of objects that participate in the association.
Indicates whether or not an association is mandatory.
Exactly one 1
Zero or more (unlimited) * (0..*)
One or more 1..*
Zero or one (optional association) 0..1
Specified range 2..4
Multiple, disjoint ranges 2, 4..6, 8
Multiplicity Indicators
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Aggregation (Shared Association)
In cases where there’s a part-of relationship between ClassA
(whole) and ClassB (part), we can be more specific and use the
aggregation link instead of the association link, taking special
notice that ClassB can also be aggregated by other classes in the
application (therefore aggregation is also known as shared
association).
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Aggregation (Shared Association)
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Composition (Not-Shared Association)
A strong form of aggregation
•The whole is the sole owner of its part.
•The part object may belong to only one whole
•Multiplicity on the whole side must be zero or one.
•The life time of the part is dependent upon the whole.
•The composite must manage the creation and destruction of
its parts.
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Composition (Not-Shared Association)
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Generalization
A sub-class inherits from its super-class
Attributes
Operations
Relationships
A sub-class may
Add attributes and operations
Add relationships
Refine (override) inherited operations
A generalization relationship may not be used to
model interface implementation.
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Generalization
A generalization is a binary taxonomic (i.e. related to
classification) directed relationship between a more general
classifier(super class) and a more specific classifier (subclass).
A generalization is shown as a line with a hollow triangle as an
arrowhead between the symbols representing the involved
classifiers. The arrowhead points to the symbol representing the
general classifier. This notation is referred to as the "separate
target style."
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Generalization
Checking, Savings, and Credit Accounts are generalized by Account
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www.advanced.edu.in
“THANK YOU”
Suman Aggarwal
Assistant Professor
Advanced Educational Institutions
Advanced Educational Institutions,
70 km Milestone,
Delhi-Mathura Road, Dist. Palwal, Haryana-121105
+91–1275–398400, 302222
Contact Email Id: sumanaggrawal@gmail.com
Website: http://www.advanced.edu.in

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