Where should I put interface?

Posted by Roman on Stack Overflow See other posts from Stack Overflow or by Roman
Published on 2010-04-20T12:16:35Z Indexed on 2010/04/20 12:23 UTC
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java

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interface

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callback

I program a class in which I have a method which takes an callback object from an external software. At the moment Eclipse says that it does not know the type of the object I gave as argument (it is expectable since I do not specify this type, it's done by the external software).

So, I think I need to write an interface for the object which I give as an argument to my method. In this respect I have two questions.

Is it really so? Can I solve the mentioned problem in the mentioned way.
If it is the case, where should I put this interface? In the same file where my class is? In the class? Outside of the class?

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