MotorizedVehicle.java

public class MotorizedVehicle extends Vehicle {

    private String ownerName;   // owner's name
    private int numWheels;      // number of wheels
    private double engineSize;  // engine size in litres

    public MotorizedVehicle() {}

    public MotorizedVehicle(String name, int wheels, double size) {
        this.ownerName = name;
        this.numWheels = wheels;
        this.engineSize = size;
    }

    public String getOwnerName() {
        return this.ownerName;
    }

    public int getNumWheels() {
        return this.numWheels;
    }

    public double getEngineSize() {
        return this.engineSize;
    }

    public double getHorsePower() {
        return (this.engineSize * this.numWheels);
    }
}