Object Based Programming

Object Oriented Programming

Rumbaugh defines object-oriented programming as programming in terms of a collection of discrete objects that incorporate both data and behaviors. In order to be object-oriented a language must support these four features:

  1. Identity: the quantization of data in discrete, distinguishable entities called objects

  2. Classication: the grouping of objects with the same structure and behavior into classes

  3. Polymorphism: the differentiation of behavior of the same operation on different classes

  4. Inheritance: the sharing of structure and behavior among classes in a hierarchical relationship

For example, C++, Objective-C, Eiffel, SmallTalk, VB.net, C#, Ada95, Java

Object Based Programming

Modern languages that provide user-defined types can provide identity and classification, and some even support polymorphism. However without inheritance these languages are not object-oriented. Cardelli and Wegner identify using user-defined types for identity and classification without inheritance as object-based programming. Since Fortran 90 lacks inheritance it is not an object-oriented language; however, its user-defined types permit its use as an object-based language.

Cardelli, L. andWegner, P. On Understanding Types, Data Abstraction, and Polymorphism. ACM Computing Surveys, 17(4), pp. 471-522 1985

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製作日期: 2/06/2001 by 丁培毅 (Pei-yih Ting)
E-mail: pyting@cs.ntou.edu.tw TEL: 02 24622192x6615
海洋大學 理工學院 資訊科學系