面向对象系统分析与设计_02_设计模式_入门 策略模式课件.ppt

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1、OOSystemAnalysis&Design【IntrotoDesignPattern】2021/7/291NeusoftComputerScienceandTechnologyDepartment©2021/7/29NeusoftComputerScienceandTechnologyDepartmentcopyright©2ThegoaloftodayOODesignPrinciple1：？2021/7/29NeusoftComputerScienceandTechnologyDepartmentcopyright©3Alittlebackgro

2、und…Thegameisaduckpondsimulationgamethatshowalargevarietyofduckspeciesswimmingandmakingquackingsounds.2021/7/29NeusoftComputerScienceandTechnologyDepartmentcopyright©4Case:DuckPondSimulationMallard:swim,display,fly,quackRedhead:swim,display,fly,quackRubber:swim,display,---,squea

3、kWooden:swim,display,---,---2021/7/29NeusoftComputerScienceandTechnologyDepartmentcopyright©5Solution:versionprototype2021/7/29NeusoftComputerScienceandTechnologyDepartmentcopyright©6MallardReadheadRubberWoodenDuckSolution:version1swim()display()fly()quack()swim()display()fly()q

4、uack()swim()display()fly()quack()swim()display()fly()quack()swim()display()fly()quack()donothingdonothingsqueakdonothing2021/7/29NeusoftComputerScienceandTechnologyDepartmentcopyright©7MallardReadheadRubberWoodenDuckSolution:version2display()fly()quack()display()fly()quack()disp

5、lay()fly()quack()display()fly()quack()swim()display()fly()quack()QuackBehavoirquack()<>FlyBehavoirfly()<>＝＝2021/7/29NeusoftComputerScienceandTechnologyDepartmentcopyright©8Whythetwoversionisn’tsowell?Theyalldependinheritance!Whatwouldwedo?2021/7/29NeusoftCo

6、mputerScienceandTechnologyDepartmentcopyright©9Arevelationfromhardware:IntegrationfixedIndependenceflexible2021/7/29NeusoftComputerScienceandTechnologyDepartmentcopyright©10IndependenceCardstructureboarddisplaycardinterfacespecssoundcardinterfacespecsdisplaycard1displaycard2disp

7、laycard3soundcard1soundcard2boardAdisplaycard3soundcard3soundcard2boardBsoundcard3displaycard22021/7/29NeusoftComputerScienceandTechnologyDepartmentcopyright©11Duckswim()display()Cardstructure.vs.Duckstructureboarddisplaycardinterfacespecssoundcardinterfacespecsdisplaycard1sound

8、card1boardAdisplaycard3soundcard2boardBsoundcar