If you had to point to polymorphism, which line would it be? [closed]

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So, lets say we have a couple of classes:

• First one is interface class, called "Messenger".

• In the second class "MessengerEx", we inherit "Messenger" interface and realize its methods.

• And also, we have "main" class.

Lets say that main looks like this:

// initialization of main class`
Messenger messengerEx = new MessengerEx();
system.out.println(messengerEx.getSomeMessage());
// ending main

If someone asked you to point where polymorphism in this program is, where would you point?

Answer 1

Obviously MessengerEx subtypes the interface Messenger which is sub-type polymorphism.