Is there a pattern for monitoring changes in the state of an object?

Question

OOP

The guys need a pattern by implementing which you can get an object that monitors the change in its state. For example, there is a Person class and I want that when this class has all the fields filled in, it would automatically call a method, for example, send ()
Is this possible?

Answer 1

Yes, if I understand correctly what you need, the observer pattern will do