How to replace run-time instanceof check with compile-time generics validation

Question

Got a little puzzle for a true Java Generics specialist... ;)

Let\'s say I have the following two interfaces:

interface Processor {
    void process(Foo          


        

Answer 1

interface Processor> {
    void process(F fooSubclass);
}

interface Foo> {
    Processor getProcessor();
}

I haven't tested that this is precisely right, but this pattern of having the generic type refer to itself is probably about as close as you are going to get with compile-time Java generics.