The HttpServlet Class. A question for all please

Hello there,
When we write our Servlets,we extend the HttpServlet class.
This class is an abstract class having the doGet() and doPost()
methods which we normally override for our custom functionality.
We cannot instantiate this class as this is abstract.
Why couldnt this be defined as an Interface then?
This could then have the same doGet() and doPost() methods which
we could then implement in our class.
Can any one explain to me this difference or am I missing anything
here.?
Wouldnt defining the HttpServlet class as an Interface be a viable
solution?
Regards
Ajay

"An interface cannot implement any methods, whereas an abstract class can"
HttpServlet extends GenericServlet and has methods so it can not be an interface.

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