Explain subclasses and polymorphism, JAVA Programming

Assignment Help:

Explain Subclasses and Polymorphism ?

Car and Motorcycle are subclasses of MotorVehicle. If you instantiate a Car or a Motorcycle along with new, you can use in which object anywhere you can use a MotorVehicle, since cars are motor vehicles. As same you can use a Motorcycle anywhere you can use a MotorVehicle. This use of a subclass object in place of a superclass object is the starting of polymorphism. I'll say more about polymorphism later.

The converse is not true. While all cars are motor vehicles, not all motor vehicles are cars. A few are motorcycles. Thus if a method expects a Car object you shouldn't provides it a MotorVehicle object instead.

Remember that I said you shouldn't provide a method in which expects a Car a MotorVehicle. I didn't say you couldn't. Objects can be cast into their subclasses. This is useful while using data structures like Vectors that only handle generic objects. It's up to the programmer to remain track of what kind of object is stored in a Vector, and to use it accordingly.

The proper choice of classes and subclasses is a skill learned primarily by experience. There are often different ways to define classes.
toString() as example of polymorphism


Related Discussions:- Explain subclasses and polymorphism

write a junit test suite, Objective The objective of this lab exercis...

Objective The objective of this lab exercise is to develop a unit test suite using JUnit Specification of the Program to be Tested You are given the source code of a Java clas

Implementation of Kruskal’s Algorithm, • A Graph Data Type (including a dis...

• A Graph Data Type (including a display method to show adjacencies) • A Cycle Checker (as described in lecture notes) • An Edge class • A sorting algorithm to sort an array of Edg

Differentiate local and global variables, Differentiate Local and Global Va...

Differentiate Local and Global Variables? Local variables are the variables have limited scope although global have bigger scope Local variables are not accessed through others

What is bandwidth, What is bandwidth? In a general way Bandwidth is a c...

What is bandwidth? In a general way Bandwidth is a capacity of communication channel of carrying data.

What are trojan horses, What are Trojan Horses? Trojan Horses are unlik...

What are Trojan Horses? Trojan Horses are unlike viruses usually they are stand-alone programs. The look such as what they are not. They appear to be something harmless and int

For in statement, It is a distinct type of loop, used to iterate through th...

It is a distinct type of loop, used to iterate through the properties of an object or the elements of an array. For instance assume the following statement that loops through th

What is the core container module, This module is gives the fundamental fun...

This module is gives the fundamental functionality of the spring framework. In this module BeanFactory is the heart of any spring-based application. The whole framework was built o

Solve neural network questions, Solve Neural Network Questions Project D...

Solve Neural Network Questions Project Description: You must know  Binary Chop and Kohonen Network, Backpropagation Algorithm. Implementation is required. Can using existi

Zhtml requirements, In addition to your Java code requirements, you also ne...

In addition to your Java code requirements, you also need to enhance the ZHTML for your application. As before, you can continue working with the page(s) you used for the previous

How to finding an applets size, Finding an Applet's Size When running i...

Finding an Applet's Size When running inside a web browser the size of an applet is set through the height and width attributes and cannot be changed by the applet. Several app

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd