Write an abstract superclass encapsulating a vehicle: A vehicle has two attribut

Question

Write an abstract superclass encapsulating a vehicle: A vehicle has two attributes: its owner's name and its number of wheels. This class has two non-abstract subclasses: one encapsulating a bicycle, and the other encapsulating a motorized vehicle. A motorized vehicle has the following additional attributes: its engine volume displacement, in liters; and a method computing and returning a measure of horse­power-the number of liters times the number of wheels. You also need to include a client class to test these two classes.

Explanation / Answer

/*
Program:
*/
//abstract superclass for encapsulating vehicle

public abstract class Vehicle {

private String ownerName;
private int numWheels;

public Vehicle() {} // default constructor

public Vehicle(String name, int wheels) { // overloaded constructor
this.ownerName = name;
this.numWheels = wheels;
}
}

//non abstract class bicycle

public class Bicycle extends Vehicle {

private String ownerName;
private int numWheels;

public Bicycle() {}

public Bicycle(String name) {
ownerName = name;
numWheels = 2;
}

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

public int getNumWheels() {
return this.numWheels;
}
}
//non abstract class Motorized vehicle
public class MotorizedVehicle extends Vehicle {

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

public MotorizedVehicle() {}

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

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

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

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

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

//client class to test the other two class
public class TestVehicle {

public static void main(String[] args) {

Bicycle racer = new Bicycle("Fred");
System.out.println("Owner = "+racer.getOwnerName());
System.out.println("Wheels = "+racer.getNumWheels());

MotorizedVehicle car = new MotorizedVehicle("Marilyn Monroe", 4, 1.6);   
System.out.println("Vehicle owner = "+car.getOwnerName());
System.out.println("Wheels = "+car.getNumWheels());
System.out.println("Engine size (litres) = "+car.getEngineSize());
System.out.println("Horse Power = "+car.getHorsePower());

} // end main()
} // end class

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