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Stimulate 2005

Stimulate 2005. System Analysis and Design (SA&D) Object Oriented modeling Part 2: Use case modeling. Instructor: Luz M. Quiroga lquiroga@hawaii.edu University of Hawaii Information and Computer Science / Library and information Science POST 314b; 808-956-9988.

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Stimulate 2005

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  1. Stimulate 2005 System Analysis and Design (SA&D) Object Oriented modeling Part 2: Use case modeling Instructor: Luz M. Quiroga lquiroga@hawaii.edu University of Hawaii Information and Computer Science / Library and information Science POST 314b; 808-956-9988

  2. Object ModelingClass Diagrams • Object • An entity that has a well-defined role in the application domain, and has state, behavior, and identity • State • A condition that encompasses an object’s properties and the values those properties have • Behavior • A manner that represents how an object acts and reacts • Object Class • A set of objects that share a common structure and a common behavior

  3. Object ModelingClass Diagrams • Class Diagram • Class is represented as a rectangle with three compartments • Objects can participate in relationships with objects of the same class

  4. Representing classes and objects UML notation Encapsulation reusability Source: Sinha

  5. Representing Associations • Association • A relationship between object classes • Degree may be unary, binary, ternary or higher • Depicted as a solid line between participating classes • Association Role • The end of an association where it connects to a class • Each role has multiplicity, which indicates how many objects participate in a given association relationship

  6. Toward class diagrams:Representing relationships Note similarity to ER Source: Sinha

  7. Class diagrams examples University example Customer order example Source: Sinha

  8. Representing Generalization • Generalization • Abstraction of common features among multiple classes, as well as their relationships, into a more general class • Subclass • A class that has been generalized • Superclass • A class that is composed of several generalized subclasses • Inheritance • A property that a subclass inherits the features from its superclass

  9. Class diagrams: representing Generalization (superclasses - subclasses) and inheritance Employee superclass Patientsuperclass Source: Sinha

  10. Representing Aggregation • Aggregation • A part-of relationship between a component object and an aggregate object • Example: Personal computer • Composed of CPU, Monitor, Keyboard, etc

  11. Class diagram: representing Aggregation: part - whole relationship Source: Sinha

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