What is Polymorphism?!!

What is Polymorphism?
----------------------------

Polymorphism gives us the ultimate flexibility in extensibility. Polymorphism is a term that describes a situation where one name may refer to different methods. In java there are two type of polymorphism: overloading type and overriding type.

When you override methods, java determines the proper methods to call at the programs run time, not at the compile time. Overriding occurs when a class method has the same name and signature as a method in parent class. Overloading occurs when several methods have same names with different method signature. Overloading is determined at the compile time.

Example: Overloading

java code

Class Book{
	String title;
	String publisher;
	float price;
setBook(String title){
}
setBook(String title, String publisher){
}
setBook(String title, String publisher,float price){
}
}

Example: Overriding

java code

Class Tool{
void operate_it(){
// implementation here.
}
}
Class ScrewDriver extends Tool{
	void operate_it(){
// implementation here.
}
}