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

Module 2 - Concepts of Object OrientationA More Formal DefinitionA More Formal Definition• An object is an entitywith a well-definedboundary and identitythat encapsulates stateand behavior.• State is represented byattributes andrelationships.• Behavior is representedby operations, methods,and state machines.AttributesOperationsObjectMastering Object Oriented Analysis and Design with UMLCopyright © 2003 Rational Software, all rights reserved 9• An object is an entity that has a well-defined boundary. That is, the purpose ofthe object should be clear.• An object has two key components: attributes and operations.• Attributes represent an object’s state, and operations represent the behavior ofthe object.• Object state and behavior are discussed on the next few slides.2 - 9