Polymorphism with example

è The ability to exist in different form is called Polymorphism

è In java , a variable, an object or a method can exist in different forms, thus performing various tasks depending on the context.

è If the same method performs different tasks, then that method is said to exhibit polymorphism.

There are two types of Polymorphism:

1.    Static polymorphism ----

 The polymorphism exhibited at compile time is called static polymorphism.

2.    Dynamic polymorphism----

à  The polymorphism exhibited at run time is called dynamic polymorphism.

è This means when a method is called, the method call is bound to the method body at the time of running the program, dynamically

è In this case, java compiler does not know which method is called at the time of compilation, only JVM knows at runtime which method is to be executed.

è Hence this is also called runtime polymorphism or dynamic binding.

Example of polymorphism

//dynamic polymorphism

class Sum

{

void add(int a, int b)

{

            System.out.println("Sum of two="+(a+b));

}

void add(int a, int b,int c)

{

            System.out.println("Sum of three="+(a+b+c));

}

}

class Polymorphism

{

      public static void main(String args[])

      {

            Sum s=new Sum();

            s.add(10,15);

            s.add(10,20,30);

      }

}