oop - Can I have one-to-one relation between observer and subject?

Question

I'm trying to create a model with observer design pattern. I'm wondering that my subject can have only one observer. I usually see one subject and many observers in examples.

question from:https://stackoverflow.com/questions/65901333/can-i-have-one-to-one-relation-between-observer-and-subject

Answer 1

Waitting for answers