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

Rfid based student attendance system include biometrics, Develop a rfid bas...

Develop a rfid based student attendance system include biometrics Project Description: The aim of our project is using rfid technology student attendance has to be taken. whe

What do you understand by java virtual machine, Java Programming 1. Wha...

Java Programming 1. What do you understand by Java Virtual Machine? 2. Write a simple Java program to display a string message and explain the steps of compilation and execu

Create a jsp code to built an application, What is required to be done from...

What is required to be done from my programming is : I enter name,day(saturady or sunday),time( 10AM and 10PM) My program must then vaildate name,day and time. Name must only a

Explain intelligent system, What is an intelligent system? Intelligent sy...

What is an intelligent system? Intelligent systems are the programs established to perform complicated jobs in which reflect human brain and thoughts. If the algorithms are too m

Write a program on filling rectangles, Write a program on Filling Rectangle...

Write a program on Filling Rectangles ? The drawRect() method draws an open rectangle, a box if you prefer. If you need to draw a filled rectangle, use the fillRect() method. O

Define array, Define Array ? Indexed collections of variable of similar...

Define Array ? Indexed collections of variable of similar data types or we can say a Set of organized variables of similar type.

The tic-tac-toe program, Instructions Modify the program so that the co...

Instructions Modify the program so that the computer will generate moves for the ‘O' player (it must continue to accept user input for ‘X'). A simple way to do this is to use a

Point of Sale Terminal, The problem statement is pretty simple. We need a s...

The problem statement is pretty simple. We need a software implementation of a Point of Sale terminal at a typical store. The users of the system are the cashiers sitting at the sa

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