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generics doubt from nikos

 
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No they are not the same. See the difference with extends and super.
With q1 there is an guaranty that all the elements are a Number or a subclass of it.
So you can retrieve elements like this:

With q2 there is an that the queue can hold elements of type Integer and subclasses of it.
 
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no matter what is on the right side when you assign both left sides should be compatible.
 
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