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Designing
Classes
By Kamesh Shekhar Prasad
Introduction
Designer has to
know
– Specification of
the class
– interaction of
that class with
other classes
Object oriented design philosophy
 Designing class with reusability in mind
-> more gain in productivity
-> reduce the time for developing new
application
UML Object Constraint Language(OCL)
 The rules and semantics of UML are expressed using OCL
UML modeling constructs requires expression. some example
as follow
– Item.selector Item -> object ,Selector -> attribute
Ex : Dheeraj.regno
– Item.selector[qualifier-value]
Qualifier is uesd to select related values Ex-Dheeraj.phone[2]
– Set->select ( Boolean expression)
Company.employee->salary>20000
Thank you

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Designing classes

  • 2. Introduction Designer has to know – Specification of the class – interaction of that class with other classes
  • 3. Object oriented design philosophy  Designing class with reusability in mind -> more gain in productivity -> reduce the time for developing new application
  • 4. UML Object Constraint Language(OCL)  The rules and semantics of UML are expressed using OCL UML modeling constructs requires expression. some example as follow – Item.selector Item -> object ,Selector -> attribute Ex : Dheeraj.regno – Item.selector[qualifier-value] Qualifier is uesd to select related values Ex-Dheeraj.phone[2] – Set->select ( Boolean expression) Company.employee->salary>20000