Not sure how to ask this question.

In some thread an object is created with a set of methods. 
Lets call this object objA. 

Later in time another objected is created perhaps in another thread (not sure 
if this note is relevant).
Lets call this object objB.

Now objB needs to call a method in objA. 

Since objB came into being after objA how does objB detect that objA exists 
before attempting to call one of its methods?

YT


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