Polymorphism

Polymorphism: ‘a state of having many shapes’ or ‘the capacity to take on different forms’. This same concept could be apply to object oriented programming languages like Java, it describes a language’s ability to process objects of various types and classes through a single, uniform interface.

For this example we are going to have two subclasses(Horse,Cat) and a parent class (Animal). Let's start by coding our parent class:

public class Animal{

   public void sound(){

      System.out.println("Animal is making a sound");   

   }

}

Then, let's code our Cat class:

public class Cat extends Animal{

    @Override

    public void sound(){

        System.out.println("A cat sounds Meow, Meow");

    }

}

Last, let's code our Horse class:

class Horse extends Animal{

    @Override

    public void sound(){

        System.out.println("A horse sounds Neighhhh, Neighhh!");

    }

}

Let's test our code: 

public class TestClass {

   public static void main(String [] args) {

   Animal cat = new Cat();

   Animal horse = new Horse();

   cat.sound();

   horse.sound();

   }

}

Output:

A cat sounds Meow, Meow

A horse sounds Neighhhh, Neighhh!