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Remember, you cannot instantiate a Vehicle anywhere in your program – instead, you can use the Car and Motorcycle classes you declared earlier and create instances of those: Vehicle newVehicle = new Vehicle(); // Invalid Vehicle car = new Car(); // valid Vehicle mBike = new Motorcycle(); // valid Car carObj = new Car(); // valid Motorcycle mBikeObj = new Motorcycle(); // valid Design a Vehicle Class Hierarchy in Java to Demonstrate Polymorphism. We group the "inheritance concept" into two categories: subclass (child) - the class that inherits from another class; superclass (parent) - the class being inherited from; To inherit from a class, use the extends keyword. Design a Vehicle Class Hierarchy in Java to Demonstrate Polymorphism. It is a superclass of all of the * other classes that represent vehicles (Automobile, Motorcycle, Truck, * and their subclasses).

), whereas Car and Truck can contain the fields and methods that are specific to Cars and Trucks. For example, public class Car extends Vehicle should be in a file called “Car.java”. These will be those attributes that all vehicles have. Java Inheritance (Subclass and Superclass) In Java, it is possible to inherit attributes and methods from one class to another. The Vehicle class can contain those fields and methods that all Vehicles need (e.g. public class Bus extends Vehicle should be in a file called “Bus.java”. * * Fields and methods that all vehicles have in common are defined * here so that they can be inherited by the subclasses of this class. Design and implement a class called Car that contains instance data that represents the make, model, and year of the car.
Make sense?
/** * Vehicle.java * * A class that represents a vehicle. a license plate, owner etc. Write the class Vehicle to represent a motor vehicle. Include getter and setter methods for all instance data, and a toString method that returns a one-line description of the car. Define the Car constructor to initialize these values. It is two types, "Compile Time Polymorphism" and …

Your code shall include: - Declarations for all attributes that belong in this class. - A constructor that gets (as parameters) a vehicle’s number, a make, a model and price (in that order). Definition of Polymorphism: Polymorphism is an ability to take more than one form.