I would appreciate help in understanding the following from 'Java Concurrency in Practice': Calling an overrideable instance method(one that is neither private nor final) from the constructor can also allow the this reference to escape. Does 'escape' here simply mean that we may probably be calling an instance method,before the instance is fully constructed? I do not see 'this' escaping the scope of the instance in any other way. How does 'final' prevent this from happening?Is there some aspect of 'final' in instance creation that I am missing?

Allowing the this reference to escape

I would appreciate help in understanding the following from 'Java Concurrency in Practice':

Calling an overrideable instance method(one that is neither private nor final) from the constructor can also allow the this reference to escape.

Does 'escape' here simply mean that we may probably be calling an instance method,before the instance is fully constructed?
I do not see 'this' escaping the scope of the instance in any other way.
How does 'final' prevent this from happening?Is there some aspect of 'final' in instance creation that I am missing?