2

Object Modelling

LEARNING OBJECTIVES

At the end of this chapter, you should be able to

  • Understand object modelling.

  • Use notations of UML to specify objects and classes, their notations, meta models and concepts like mandatory profiles, meta data, meta classes, etc.

  • Learn to use class diagrams and object diagrams of UML.

  • Understand the concept of links and hierarchy, polymorphism and abstract classes in OOPS language.

2.1 Introduction

Object modelling encompasses all the elements that we studied in Chapter 1 regarding objectoriented (OO) methodology. The principles of object modelling are abstraction, encapsulation, modularity, hierarchy, typing, concurrency and persistence.

In conventional programming styles, we conceive the problem and ...

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