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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
What is the difference between a while statement and a do while statement? A while statement checks at the starting of a loop to see whether the next loop iteration should occu
1 occurrence of "oog", and 1 occurrence each of "goog", "oogo",
Overall Requirements Every phone number is broken up into sections as shown below: Country Code Area Code Prefix Line Number 1 919 882 5000 Write a program to separate out a ph
Difference between HashMap and Hash table HashMap: It allow us to have null values and also one null key It is Unsynchronized. Iterator in HashMap is Fail-Safe.
Write a program to add integer value? class AddInts { public static void main (String args[]) { int i = 1; int j = 2; System.out.println("i is " + i); System.out.println("
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Develop a School java project Project Description: Programming java, threads. Not so hard but requires knowledgeSkills required: Java
explain multiple inheritance in java ?.
A:Java is a computer language. There are some of the reasons which describe: 1. Built-in support for multi-threading, memory management (automatic garbage collection), and
This language was designed to adapt the changing environment and behavior. New methods and instance variables can be added to the client side without any major changes happening at
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