What is Polymorphism inwards Java? Overriding or Overloading?

Polymorphism vs Overloading vs Overriding

Someone asked me What are the divergence betwixt Polymorphism together with Overriding inwards Java together with the similar difference betwixt Polymorphism together with Overloading. Well, they are non 2 dissimilar things, Polymorphism is an object oriented or OOPS concept similar Abstraction, Encapsulation or Inheritance which facilitate the role of the interface together with allows Java programme to accept wages of dynamic binding inwards Java. Polymorphism is too a way through which a Type tin laissez passer on the axe bear differently than expected based upon which sort of Object it is pointing. Overloading together with overriding are 2 forms of Polymorphism available inwards Java.

Both overloading together with the overriding concept are applied on methods inwards Java. Since polymorphism literally way taking multiple forms, So fifty-fifty though you lot direct maintain the advert of the method same inwards the instance of overloading together with overriding, an actual method called tin laissez passer on the axe last whatever of those multiple methods amongst the same name. Let's run across unopen to to a greater extent than details on method overloading together with overriding to sympathize how polymorphism relates to overloading together with overriding together with How they are different.

Polymorphism vs Overriding

Overriding is a cast of polymorphism which is used inwards Java to dynamically bind method from the subclass inwards reply to a method telephone telephone from sub class object referenced past times superclass type. Method overriding is bonded using dynamic binding inwards Java.

Suppose you lot direct maintain 2 methods size() inwards both base of operations class together with derived class together with Base class variable is pointing to an object which happens to last subclass object at runtime together with hence method from subclass volition last called, i.e. overridden method volition last called.

This allows to program for interface than implementation, a pop OOPS blueprint principle because Polymorphism guarantees to invoke right method based upon the object. Method overriding is fundamental for much flexible blueprint pattern inwards Java.

See What is method overriding inwards Java and Rules of method Overriding for examples together with to a greater extent than details.

Polymorphism vs Overloading

Method overloading is unopen to other cast of Polymorphism though unopen to people fence against that. In the instance of overloading, you lot too got multiple methods amongst the same advert simply dissimilar method signature simply a telephone telephone to right method is resolved at compile fourth dimension using static binding inwards Java. Overloading is a compile fourth dimension activity oppose to Overriding which is runtime activity. Because of this argue overloading is faster than method overriding inwards Java. Though beware amongst an overloaded method which creates conflict e.g. methods amongst solely i parameter e.g. int together with long etc. See What are method overloading inwards Java for instance together with consummate details.

An Example of Polymorphism inwards Java

An instance of Polymorphism inwards Java

subclass Dog together with Cat.

import java.util.ArrayList;
import java.util.List;

abstract class Pet{
public abstract void makeSound();
}

class Cat extends Pet{

@Override
public void makeSound() {
System.out.println("Meow");
}
}

class Dog extends Pet{

@Override
public void makeSound() {
System.out.println("Woof");
}

}

Let's assay out How Polymorphism concept move inwards Java:

/**
*
* Java programme to demonstrate What is Polymorphism
* @author Javin Paul
*/
public class PolymorphismDemo{

public static void main(String args[]) {
//Now Pet volition exhibit How Polymorphism move inwards Java
List<Pet> pets = new ArrayList<Pet>();
pets.add(new Cat());
pets.add(new Dog());

//pet variable which is type of Pet bear dissimilar based
//upon whether pet is Cat or Dog
for(Pet pet : pets){
pet.makeSound();
}

}
}

Output:
Meow
Woof

In Summary, you tin laissez passer on the axe non compare Polymorphism amongst method overloading or override. Polymorphism is the mightiness of a variable to bear differently based upon which sort of Object it is referring. They are Java programming language's way to implement polymorphism inwards language.

Other Java together with OOPS tutorial for programmers

10 blueprint pattern interview questions inwards Java – Answered

What is Factory method blueprint pattern inwards Java

What is Observer blueprint pattern inwards Java

How to implement Singleton pattern inwards Java

How to implement Producer Consumer pattern inwards Java

Further Reading
Head First Object-Oriented Analysis together with design
Head First Design Pattern