How polymorphism is used in java?

Answer 1

Polymorphism is the feature that allows one interface to be used for general class actions.

class CPolygon {

protected:

int width, height;

public:

void set_values (int a, int b)

{ width=a; height=b; }

virtual int area (void) =0;

void printarea (void)

{ cout << this->area() << endl; }

};

class CRectangle: public CPolygon {

public:

int area (void)

{ return (width * height); }

};

class CTriangle: public CPolygon {

public:

int area (void)

{ return (width * height / 2); }

};

int main () {

CPolygon * ppoly1 = new CRectangle;

CPolygon * ppoly2 = new CTriangle;

ppoly1->set_values (4,5);

ppoly2->set_values (4,5);

ppoly1->printarea();

ppoly2->printarea();

delete ppoly1;

delete ppoly2;

return 0;

}

By

MUTHU

Answer 2

Polymorphism is the association between a generalized reference and a more specific object. For instance, consider the following code:

Animal a = new Dog(); //right

Dog d = new Animal(); //wrong

In the first example, the reference ais referencing a Dog object. So when a method call is made, such as:

a.eat();

the eat method is carried out by the Dog object that areferences.

The second example is incorrect, because not all Animals can perform Dog actions, so a method call of d.bark() does not make sense, because not all Animals can bark.

same action can act differently on different object

ex- operation move can be different for Chess and a person

Answer 3

1. Single Inheritance

A Scenario where one class is inheriting/extending the behavior of just one super class.

Ex: public class Ferrari extends Car {…}

2. Multilevel Inheritance

A Scenario where one class is inheriting/extending the bahavior of another class which in turn is inheriting behavior from yet another class.

Ex: public class Automobile {…}

Public class Car extends Automobile {…}

Public class Ferrari extends Car {…}

This multilevel inheritance actually has no limitations on the number of levels it can go. So as far as java goes, it is limitless. But for maintenance and ease of use sakes it is better to keep the inheritance levels to a single digit number.

Answer 4

Polymorphism can be considered as the ability of one thing being multiple other things (though partially or fully). Am I confusing you? I believe yes. To put it in simpler words, any java object that can pass more than one Is-A test can be considered polymorphic

There are two important concepts in polymorphism

• Method Overloading and

• Method Overriding

Overridden Methods

Any time you have a class that inherits a method from a superclass, you have the opportunity to override the method (unless, as you learned in the earlier chapters, the method is marked final). The key benefit of overriding is the ability to define behavior that's specific to a particular subclass type. The following example demonstrates a Porsche subclass of Car overriding the Car version of the drive() method:

public class Car {

public void drive() {

System.out.println("Generic Car Driving Generically");

}

}

class Porsche extends Car {

public void drive() {

System.out.println("Porsche driving Full Throttle");

}

}

Overloaded Methods

Let us say we have the Ferrari class with a method drive() as below:

Public class Ferrari extends Car {

Public void drive() {…}

}

Below are the legal overload method declarations:

1. public void drive(String destination, String roadToTake) {…}

2. public void drive(String destination, int timeToTake) {…}

3. public void drive(String destination) throws RouteNotFoundException {…}

Assuming that the Ferrari class has the above 3 methods, below are is an illegal overload:

1. public String drive (String destination, String roadToTake) {…} - You cannot have two methods which differ just in the return type. This is not allowed

Answer 5

Polymorphism is used in Java when we want multiple things to represent the same entity. The usage definition might be misleading but, powerful features like Method Overloading and Method Overriding can be used to tap the potential of polymorphism in Java and implement complex functionalities with ease.

Answer 6

polymorphism is more than one name with different forms

Answer 7

By implementing polymorphism we need to use overloading and overriding Technics in program..

Answer 8

Polymorphism means The ability to take more than on form