Polymorphism

Polymorphism

Basically, 'Poly' means many and 'Morph' means behavior or forms so many behaviors in programming. same functionality are same object which has many behaviors.



Example Code for Ploymorphism Concept

class DemoOverload{

    public int add(int x, int y){  //method 1

    return x+y;

    }

    public int add(int x, int y, int z){ //method 2

    return x+y+z;

    }

    public int add(double x, int y){ //method 3

    return (int)x+y;

    }

    public int add(int x, double y){ //method 4

    return x+(int)y;

    }

}

class Test{

    public static void main(String[] args){

    DemoOverload demo=new DemoOverload();

    System.out.println(demo.add(2,3));     //method 1 called

    System.out.println(demo.add(2,3,4));   //method 2 called

    System.out.println(demo.add(2,3.4));   //method 4 called

    System.out.println(demo.add(2.5,3));   //method 3 called

    }

}

There are two common ways of implementing Polymorphism.
1. Overloading
2. Overriding

Overloading
Using the same method name with different parameter types lists.

Overriding
Using the different implementations of the same method in sub classes.