LookupEvent Generics and Wildcard [rawtype] best usage pattern suggestion

To answer myself, there is actually a critical difference between <?> and <? extends Object> as the first is reifiable whereas the second is not. See http://stackoverflow.com/questions/14346622/list-vs-list-extends-object

This is critical as my code is using "instanceof" and hence need the <?>.


Code:
    @Override
    public void resultChanged(LookupEvent lookupEvent) {
        Lookup.Result<?> r = (Lookup.Result) lookupEvent.getSource();
        Collection<?> c = r.allInstances(); 
        if (!c.isEmpty()) {
            for (Object o : c) {
                if (o instanceof XYZ) {




This is at least my understanding. Correct me if I am wrong.