Uml diagrams

UML Diagrams
By
Ms.A.Thamizhiniyal, M.C.A.,
M.Phil.,
Assistant Professor,
Bon Secours College for Women,
Thanjavur.

What is UML?
• Standard language for specifying, visualizing, constructing,
and documenting the artifacts of software systems, business
modeling and other non-software systems.
• The UML represents a collection of best engineering practices
that have proven successful in the modeling of large and
complex systems.
• The UML is a very important part of developing object
oriented software and the software development process.
• The UML uses mostly graphical notations to express the
design of software projects.
• Using the UML helps project teams communicate, explore
potential designs, and validate the architectural design of the
software.

Overview of UML Diagrams
Structural
: element of spec. irrespective of time
• Class
• Component
• Deployment
• Object
• Composite structure
• Package
Behavioral
: behavioral features of a system / business
process
• Activity
• State machine
• Use case
• Interaction
Interaction
: emphasize object interaction
• Communication(collaberati
on)
• Sequence
• Interaction overview
• Timing

Class diagram
Class diagrams show the classes of the system,
their inter-relationships, and the operations and
attributes of the classes
• Explore domain concepts in the form of a domain model
• Analyze requirements in the form of a conceptual/analysis
model
• Depict the detailed design of object-oriented or object-based
software

Component diagram
• Component diagrams shows the
dependencies among software components,
including the classifiers that specify them (for
example implementation classes) and the
artifacts that implement them; such as source
code files, binary code files, executable files,
scripts and tables.

Deployment diagram
• Deployment diagram depicts a static view of
the run-time configuration of hardware nodes
and the software components that run on those
nodes.
• Deployment diagrams show the hardware for
your system, the software that is installed on
that hardware, and the middleware used to
connect the disparate machines to one another.

Object diagram
• Object diagrams (instance diagrams), are
useful for exploring real world examples of
objects and the relationships between them.
• It shows instances instead of classes.
• They are useful for explaining small pieces
with complicated relationships, especially
recursive relationships.

Package diagram
• Package diagrams simplify complex class
diagrams, it can group classes into packages.
A package is a collection of logically related
UML elements.
• Packages are depicted as file folders and can
be used on any of the UML diagrams.

Composite structure diagram
• Composite structure diagrams used to explore
run-time instances of interconnected instances
collaborating over communications links.
• It shows the internal structure (including parts
and connectors) of a structured classifier or
collaboration.

Activity diagram
• Activity diagrams helps to describe the flow of
control of the target system, such as the
exploring complex business rules and
operations, describing the use case also the
business process.
• It is object-oriented equivalent of flow charts
and data-flow diagrams (DFDs).

State machine diagram
• State machine diagrams can show the
different states of an entity also how an entity
responds to various events by changing from
one state to another.
• The history of an entity can best be modeled
by a finite state diagram.

Use cases diagram
Use cases diagrams describes the behavior of the target system
from an external point of view. Use cases describe "the meat"
of the actual requirements.
• Use cases. A use case describes a sequence of actions that
provide something of measurable value to an actor and is
drawn as a horizontal ellipse.
• Actors. An actor is a person, organization, or external system
that plays a role in one or more interactions with your system.
Actors are drawn as stick figures.
• Associations. Associations between actors and use cases are
indicated by solid lines. An association exists whenever an
actor is involved with an interaction described by a use case.

Communication diagram
• Communication diagrams used to model the
dynamic behavior of the use case.
• When compare to Sequence Diagram, the
Communication Diagram is more focused on
showing the collaboration of objects rather
than the time sequence.

Sequence diagram
• Sequence diagrams models the collaboration
of objects based on a time sequence.
• It shows how the objects interact with others
in a particular scenario of a use case.

Timing diagram
• Timing diagrams shows the behavior of the
objects in a given period of time.
• Timing diagram is a special form of a
sequence diagram.
• The differences between timing diagram and
sequence diagram are the axes are reversed so
that the time are increase from left to right and
the lifelines are shown in separate
compartments arranged vertically.

Interaction overview diagram
• Interaction overview diagrams focuses on the
overview of the flow of control of the
interactions.
• It is a variant of the Activity Diagram where
the nodes are the interactions or interaction
occurrences.
• It describes the interactions where messages
and lifelines are hidden.

Uml diagrams

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Editor's Notes