ch02_OO - Chapter 2: Object Orientation -a Technique Jun...

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1 Jun Shu, [email protected] Penn State Chapter 2: Object Orientation —a Technique 2 Chapter 2 Chapter Objectives After studying this chapter you should be able to: ± Define an object. ± Understand the terms class , attribute , and operations. ± Explain generalization, polymorphism, and inheritance. ± Define association. ± Describe modeling and the Unified Modeling Language. 3 Chapter 2 Unified Modeling Language (UML) A standard notation for representing object- oriented systems Boxes represent classes, components, packages, objects ± Containing attributes and operations ± Provide interfaces to external entities Lines represent generalization and other relationships
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4 Chapter 2 Sample UML Diagram 5 Chapter 2 What Is an Object? An entity that encapsulates data and behavior ± Objects are categorized into classes ± Each individual object is an instance of a class 6 Chapter 2 What Is Encapsulation? The characteristic of object-orientation
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This note was uploaded on 04/16/2008 for the course MIS 432 taught by Professor Junshu during the Spring '08 term at Pennsylvania State University, University Park.

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ch02_OO - Chapter 2: Object Orientation -a Technique Jun...

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