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Java 9 Cookbook by Nick Samoylov, Mohamed Sanaulla

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How it works...

Let's write a test program:

public static void main(String... arg) {  double timeSec = 10.0;  int engineHorsePower = 246;  int vehicleWeightPounds = 4000;  Vehicle vehicle = new Car(4, vehicleWeightPounds, engineHorsePower);  System.out.println("Passengers count=" +                      ((Car)vehicle).getPassengersCount());  System.out.println("Car speed (" + timeSec + " sec) = " +                      vehicle.getSpeedMph(timeSec) + " mph");  vehicle = new Truck(3300, vehicleWeightPounds, engineHorsePower);  System.out.println("Payload=" +                      ((Truck)vehicle).getPayload() + " pounds");  System.out.println("Truck speed (" + timeSec + " sec) = " +                      vehicle.getSpeedMph(timeSec) + " mph");}

Notice that the reference vehicle to the base class Vehicle points to the object of the ...

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