Quiz: Polymorphism

Mon, 01 Jan 0001 00:00:00 +0000

📝 Test your knowledge#

Have you really grasped the internal mechanics of polymorphism and Vtables? This is the moment to check whether you have mastered the difference between static and dynamic binding. Click “See the answer” to confirm.

Question 1#

In the code Animal a = new Dog();, if you call a.SayHello() (a non-virtual method), which version of the method is executed?

A) The one from the Dog class because the object is a Dog.
B) The one from the Animal class because the variable is of type Animal.
C) None, it causes a compilation error.
D) The Dog’s one, only if it uses the override keyword.

🔻 See the answer

Answer B: The one from the `Animal` class.
Since the method is not virtual, the compiler uses static binding. It relies solely on the type of the variable (`Animal`) and sets in stone the call to `Animal.SayHello` as early as compile time.

Question 2#

Which C# keyword enables dynamic binding (a call via the Vtable) in the base class?

Polymorphism in C# on Technical Notes

Quiz: Polymorphism

📝 Test your knowledge#

Question 1#

Question 2#