Is it OK to call function from constructor?

No, it’s not good practice . The constructor is a “magic” method which doesn’t return anything and it should never be called manually. PHP calls this when the new constructor or the inspector functions for creating objects are called.

All the C++ implementations need to call the version of the function defined at the level of the hierarchy in the current constructor and not further. You can call a virtual function in a constructor .

The this keyword in Java is a reference to the object of the current class. Using it, you can refer a field, method or, constructor of a class. Therefore, if you need to invoke a constructor explicitly you can do so, using “this()” .