C# 面向?qū)ο蟪绦蛟O(shè)計CSCH5

1第5章繼承和多態(tài)繼承基類和派生類自頂向下的分解自底向上的抽象2圖形飛機(jī)汽車輪船交通工具繼承基類和派生類.NET類庫3繼承基類和派生類4publicclassAutomobile{privatefloatspeed=100;publicfloatRun(floatdistance){returndistance/speed;}}publicclassBus:Automobile{}Automobilea1=newAutomobile();a1.Run(1000);Busb1=newBus();b1.Run(1000);繼承對象的生命周期構(gòu)造析構(gòu)5publicclassVehicle{}publicclassAutomobile:Vehicle{}publicclassCar:Automobile{}publicclassLimousine:Car{}newVehicle()newAutomobile()newCar()newLimousine()~Vehicle()~Automobile()~Car()~Limousine()多態(tài)性基類：普通成員派生類：覆蓋成員6publicclassAutomobile{protectedfloatspeed;protectedfloatweight;publicfloatRun(floatdistance){returndistance/speed;}}publicclassCar:Automobile{publicnewfloatRun(floatdistance){return(1+weight/100)*distance/speed;}}多態(tài)性覆蓋：根據(jù)聲明類型決定成員調(diào)用7Automobilea1=newTruck();a1.Run(1000);Cara2=newCar();a2.Run(1000);Automobile.RunCar.Run多態(tài)性基類：虛擬成員8publicclassAutomobile{protectedfloatspeed;protectedfloatweight;publicvirtualfloatRun(floatdistance){returndistance/speed;}}多態(tài)性基類：虛擬成員派生類：重載成員9publicclassTruck:Automobile{privatefloatload;publicoverridefloatRun(floatdistance){returnbase.Run(1+(load+weight)/100);}}publicclassCar:Automobile{publicoverridefloatRun(floatdistance){return(1+weight/100)*distance/speed;}}多態(tài)性重載：根據(jù)實(shí)際類型決定成員調(diào)用10Automobilea1=newCar();a1.Run(1000);Automobilea2=newTruck();a2.Run(1000);Car.RunTruck.Run多態(tài)性抽象類和抽象方法11publicabstractclassAutomobile{protectedfloatspeed;protectedfloatweight;publicabstractfloatRun(floatdistance);}Automobilea1=newAutomobile();多態(tài)性抽象類和抽象方法12publicclassTruck:Automobile{privatefloatload;}多態(tài)性抽象類和抽象方法13publicclassTruck:Automobile{privatefloatload;publicoverridefloatRun(floatdistance){returnbase.Run(1+(load+weight)/100);}}多態(tài)性密封類和密封方法14publicclassBigTruck:Truck{}publicsealedclassTruck:Automobile{privatefloatload;publicoverridefloatRun(floatdistance){returnbase.Run(1+(load+weight)/100);}}多態(tài)性密封類和密封方法15publicclassBigTruck:Truck{publicoverridefloatRun(floatdistance){returnbase.Run(1+2*(load+weight)/100);}}publicclassTruck:Automobile{privatefloatload;publicsealedfloatRun(floatdistance){returnbase.Run(1+(load+weight)/100