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4- In the following UML, class Car is an abstract class. Explain the role of an abstract class CarExhibition Car price: double year, int void addCar (double price, int year) void addSportCar (double price, int year) int getTotalPrice String toString() double calculateSalePrice () SportCar ClassicCar double calculate Sale Price () double calculateSale Price 6- From the question 4 Write a Java version of class Car assuming it has this constructor: public Car(double price, int year) and that the method calculateSalePrice () is abstract. (Ctrl)