What is Function Overloading and Overriding in OPPs?

Function Overloading and Overriding is the abilty of programming laguage to create multiple function with same name with different implementations

-Wikipedia

Function Overloading

Method or function overloading is generally used to increase the readability of the program. How? When we have a class with a bunch of functions and there are some functions having almost the same functionality or maybe a little different  We create them using the same name but remember one thing they should accept different parameters. Method overloading is performed within the same Class.

  • Method overloading is performed within a Class.
  • Method overloading is an example of Compile-time Polymorphism

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Method Overriding

Method overriding is used to provide the specific implementation of the method that is already provided by the superclass. How? When we create an instance of a class and we know that this class has the same properties and methods in the new instance class however if we want to overwrite a function in the newly instantiated class specifically, this is called Method Overriding. There is a condition that the Parameters should be same in the both Methods.

  • Method overriding occurs in two classes that have IS-A (Instance) relationship
  • In the case of Method Overriding, Parameters MUST be the same
  • Method overriding is the example of RUN time Polymorphism
  • The return type must be same or Co-variant in Method overriding

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Comments & Questions (1 conversations)

Er Kumar Anup · 11 months ago

I know little what is overloading and overriding. By reading this awesome blogpost all doubts are cleared. Thank you sir for such a clearcut concepts.


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