generics: how to tell more about the parameter?

Hi!

I'd like to promise certain things about the parameter of a generic:

public class Foo<Bar implements Something> {
...
}

but that's a syntax error immediately -- javac expects a closing `>' right
where the space after `Bar' is in the above example...

How can I do this -- so that I can rely on Bar's features inside Foo and
have the compiler enforce the possible Bar's compliance?

Thanks!

-mi
.

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