Polymorphism

  • Polymorphism in java is a concept by which we can perform a single action by different ways.
  • Polymorphism is the ability of an object to take on many forms.
  • There are two types of polymorphism in java
  1. Compile time polymorphism (Static)
  2. Runtime polymorphism (Dynamic)
  • We can perform polymorphism in java
  1. Method overloading
  2. Method overriding.

Method Overloading:

If a class has multiple methods by same name but different parameters, it is called as Method Overloading.

Example of method overloading

class DemoCal

{

void sum (int a,int b)

{

System.out.println (a+b);

}

void sum (int a, int b, int c)

{

System.out.println (a+b+c);

}

 

public static void main(String args[])

{

DemoCal a=new DemoCal ();

a.sum (10, 10, 10);

a.sum (20, 20);

}

Output:30           40

Method Overriding:

If subclass (child class) has the same method as declared in the parent class, it is known as method overriding in java.

Example:

class Bank

{

int getRateOfInterest(){return 0;}

}

class SBI extends Bank

{

int getRateOfInterest(){return 8;}

}

class ICICI extends Bank

{

int getRateOfInterest(){return 7;}

}

class AXIS extends Bank

{

int getRateOfInterest(){return 9;}

}

class Test2

{

public static void main(String args[])

{

SBI s=new SBI ();

ICICI i=new ICICI();

AXIS a=new AXIS();

System.out.println ("SBI Rate of Interest: "+s.getRateOfInterest ());

System.out.println ("ICICI Rate of Interest: "+i.getRateOfInterest ());

System.out.println ("AXIS Rate of Interest: "+a.getRateOfInterest ());

}

}

Output:

SBI Rate of Interest: 8

ICICI Rate of Interest: 7

AXIS Rate of Interest: 9


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