信息时代的管理信息系统Module_G课件

1、Extended Learning Module GObject-Oriented TechnologiesTRADITIONAL TECHNOLOGY APPROACH Information ViewInformation view all of the information stored within a systemOBJECT-ORIENTED TECHNOLOGY APPROACHObject-oriented (OO) approach combines information and procedures into a single view5 CONCEPTS OF OO

2、TECHNOLOLGIESInformation (number one)Information are key characteristics stored within a system. Examples include:Student Last NameStudent First NameFinal Course Grade5 CONCEPTS OF OO TECHNOLOLGIESProcedures (number two)Procedure manipulates or changes information. Examples include:CRUD Student Last

3、 NameCalculate Final Course Grade5 CONCEPTS OF OO TECHNOLOLGIESClass (number three)Class contains information and procedures and acts as a template to create objectsInformation decomposition breaking down the information and procedures for ease of use and understandability5 CONCEPTS OF OO TECHNOLOLG

4、IESObject (number four)Object an instance of a classAn object is the actual item represented by the classAlana and Samuel in Figure G.4 on the following slide are objectsEvery member is a separate objectObjects in OO Technologies5 CONCEPTS OF OO TECHNOLOLGIESMessages (number five)Message how objects

5、 communicate with each otherOne object can send a message to another object asking it to perform a certain procedure3 FUNDAMENTAL OO PRINCIPLESThe three fundamental principles of object-oriented technologies are:InheritanceEncapsulationPolymorphismInheritanceInheritance the ability to define supercl

6、ass and subclass relationships among classesTake a minute and review Figure G.6 on the following slide to determine which class is the superclass which is the subclassInheritanceEncapsulationEncapsulation information hidingInterface any device that calls procedures and can include such things as a keyboard, mouse, and touch screenPolymorphismPolymorphism to have many formsThe word “bark” can mean tree bark or a dogs