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Object Orientation Concepts
About Object Oriented Technology
Development and OO Modeling History
Prepared By:
Minal Maniar
Assistant Professor
Computer Dept.
CSPIT, CHARUSAT, Changa
Outline • Object Oriented Technology
– What is Object-Orientation?
– OO Themes
• Development and OO Modeling History – What is OO Development?
– OO Modeling History
– Modeling Concepts
– Modeling as a Design Technique
– Modeling
– Abstraction
– The 3 Models (Class Model, State Model, Interaction Model)
Object Oriented Technology
• What Is Object-Orientation?
• Characteristics of Object
– Identity
– Classification
– Inheritance
– Polymorphism
OO Development
• What Is OO Development?
– It is a conceptual process independent of a programming language until the final stages- way of thinking , not a programming technique
• Software life Cycle
– System Conception
– Analysis
– System Design
– Class Design
– Implementation
OO Development(2)
• Modeling Concepts, Not Implementations – In Past , OO community focused on Programming
languages, emphasizing on implementation rather than underlying thought process
– Difficulties in addressing front-end conceptual issues
• OO Methodology – System Conception
– Analysis
– System Design
– Class Design
– Implementation
OO Modeling History
• OMT – introduced in 1991
• Popularity of OO modeling led to a new Problem – Plethora of alternative notations, - similar idea - Different Symbols
• Consolidating the Various notations
OO Modeling History(2)
1994
Rumbaugh and Grady Booch started working on unifying the OMT notations
1995 Ivar Jacobson joined this work
1996 OMG issued a request for standard OO modeling notations
1994 OMG accepted the resulting UML as a standard The participating companied transferred UML rights to the OMG
1996 OMG issued a request to various organizationsfor standard OO modeling notations
2001 OMG members revised specifications – UML 1
Useful Links
• Useful Links:
– http://www.omg.org/spec/UML/2.4.1/
– http://www.omg.org/gettingstarted/gettingstartedindex.htm
– http://www.uml.org/
UML • The Unified Modeling Language™ (UML®) is a standard
visual modeling language intended to be used for modeling business and similar processes, analysis, design, and implementation of software-based systems
• UML is a common language for business analysts, software architects and developers used to describe, specify, design, and document existing or new business processes, structure and behavior of artifacts of software systems.
• UML can be applied to diverse application domains (e.g., banking, finance, internet, aerospace, healthcare, etc.) It can be used with all major object and component software development methods and for various implementation platforms (e.g., J2EE, .NET).
Modeling as a Design Technique
• What is model?– A model is a simplification of reality. It is an abstraction of something for the purpose of understanding it before building it.
– Examples: architectural models, airplane model for wind tunnel test, pencil sketches for oil paintings, blueprint of machine parts, outline of books
Why we Model? • Purpose of Modeling:
– Testing a physical entity before building it – Communication with Customers – Visualization – Reduction of Complexity
• Thus, through modeling we achieve four aims. – Models help us to visualize a system as it is or as we want
it to be. – Models permit us to specify the structure or behavior of
the system. – Models give us a template that guides us in constructing a
system. – Models document the decision we have made.
Modeling as a Design Technique(2)
• The Three Models – Class Model: describes the structure of objects in
a System their identity, relationships to other objects, their attributes and their operations
– It provides the context for the state and interaction models
– State Model
– Interaction Model
• Relationship among the Models
UML Modeling Types
• Structural Modeling: captures the static features of a system
• Behavioral Modeling: describes the interaction in the system. It represents the interaction among the structural diagrams
References
• Book: Object-Oriented Modeling and Design with UML by Michael Blaha James R Rumbaugh
• www.youtube.com/watch?v=3cmzqZzwNDM
• creately.com/blog/diagrams/uml-diagram-types-examples/