How does the javax.servlet.http.HttpServletRequest Interface work?

If this really is an interface, then its methods should be abstract and have no implementation. And yet when i call request.getParameters(String);
then I recieve a result. Where is the implementation for this method, or what mechanism are they using to implement it?

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an interface is a way of specifying a particular set of methods a class must have... thus, if u say that request is of the type HttpServletRequest, it just means that the object that request points to fulfills that particular contract... if u have an object at hand, it already implements all the methods it 'needs'...

so to ur qn, the implementation for this method is in the class that the object is of (which u can get at by looking at request.getClass())...

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