Why does the default parameterless constructor go away when you create one with parameters

user_1471231 0
Viewed 17245

In C#, C++ and Java, when you create a constructor taking parameters, the default parameterless one goes away. I have always just accepted this fact, but now I've started wondering why.

What is the reason for this behavior? Is it just a "safety measure/guess" saying "If you've created a constructor of your own, you probably don't want this implicit one hanging around"? Or does it have a technical reason that makes it impossible for the compiler to add one once you have created a constructor yourself?

default-constructor c++ java c#
11 Answers

A class need a constructor. It is mandatory requirement.

  • If you don't create one, parameterless constructor will be given to you automatically.
  • If you don't want a parameterless constructor, then you need to create your own.
  • If you need both, parameterless constructor and parameter based-constructor you can add them manually.

I will answer you question with another, why do we want always a default parameterless constructor? there are case where this is not desired, so the developer has the control to add or remove it as is need.

user_4807000
Related