面向对象系统分析与设计_02_设计模式_入门课件.ppt

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1、OOSystemAnalysis&Design【IntrotoDesignPattern】9/7/20211NeusoftComputerScienceandTechnologyDepartment©ThegoaloftodayOODesignPrinciple1：？9/7/20212NeusoftComputerScienceandTechnologyDepartmentcopyright©Alittlebackground…Thegameisaduckpondsimulationgamethatshowalargevariet

2、yofduckspeciesswimmingandmakingquackingsounds.9/7/20213NeusoftComputerScienceandTechnologyDepartmentcopyright©Case:DuckPondSimulationMallard:swim,display,fly,quackRedhead:swim,display,fly,quackRubber:swim,display,---,squeakWooden:swim,display,---,---9/7/20214NeusoftCo

3、mputerScienceandTechnologyDepartmentcopyright©Solution:versionprototype9/7/20215NeusoftComputerScienceandTechnologyDepartmentcopyright©MallardReadheadRubberWoodenDuckSolution:version1swim()display()fly()quack()swim()display()fly()quack()swim()display()fly()quack()swim

4、()display()fly()quack()swim()display()fly()quack()donothingdonothingsqueakdonothing9/7/20216NeusoftComputerScienceandTechnologyDepartmentcopyright©MallardReadheadRubberWoodenDuckSolution:version2display()fly()quack()display()fly()quack()display()fly()quack()display()f

5、ly()quack()swim()display()fly()quack()QuackBehavoirquack()AbstractclassFlyBehavoirfly()Abstractclass＝＝9/7/20217NeusoftComputerScienceandTechnologyDepartmentcopyright©Whythetwoversionisn’tsowell?Theyalldependinheritance!Whatwouldwedo?9/7/20218NeusoftComputerScienceandT

6、echnologyDepartmentcopyright©Arevelationfromhardware:IntegrationfixedIndependenceflexible9/7/20219NeusoftComputerScienceandTechnologyDepartmentcopyright©IndependenceCardstructureboarddisplaycardinterfacespecssoundcardinterfacespecsdisplaycard1displaycard2displaycard3s

7、oundcard1soundcard2boardAdisplaycard3soundcard3soundcard2boardBsoundcard3displaycard29/7/202110NeusoftComputerScienceandTechnologyDepartmentcopyright©Duckswim()display()Cardstructure.vs.Duckstructureboarddisplaycardinterfacespecssoundcardinterfacespecsdisplaycard1soun

8、dcard1boardAdisplaycard3soundcard2boardBsoundcard3displaycard2fly:FlyBehavoirquack:QuackBehavoirFlyBehavoirfly()Abstractclas