DEV475 Mastering Object-Oriented Analysis and Design with UML ...

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DEV475 Mastering Object-Oriented Analysis and Design with UMLAn Object Has IdentityAn Object Has Identity• Each object has a unique identity, even ifthe state is identical to that of anotherobject.Professor “J Clark”teaches BiologyProfessor “J Clark”teaches BiologyMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved 12In the real world, two people can share the same characteristics: name, birth date,job description. Yet, there is no doubt that they are two individuals with their ownunique identities.The same concept holds true for objects. Although two objects may share the samestate (attributes and relationships), they are separate, independent objects with theirown unique identity.2 - 12
Module 2 - Concepts of Object OrientationRepresenting Objects in the UMLRepresenting Objects in the UML• An object is represented as a rectanglewith an underlined name.J Clark : ProfessorNamed ObjectProfessor J Clark: ProfessorUnnamed ObjectMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved 13• An object is represented as a rectangle.• Within the rectangle, underlined, is the name of the class. To name an object,add its name before the colon.• To keep an object unnamed (anonymous), do not include a name.2 - 13
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