derived class how to

From: f (ffunus_at_yahoo.com)
Date: 11/30/03 

Date: 29 Nov 2003 22:34:54 -0800

Suppose I have

class Data{
...
}

class DData extends Data{
...
}

interface A {
   Data getData();
}

interface DA{
   DData getData();
}

What I want from DA is to focus on a special kind of Data, while it
still can be used as A. But it does not compile. How can I fixed it?

Can I do this:

interface A {
   void getData(Data data);
}

interface DA{
   void getData(DData data);
}

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