Trying to iterate through Class[ ] comparing using instanceof

I'm trying to iterate through an array of Class to determine if candidate object is 'interesting'. A, B, C, D don't have an appropriate parent class (they are siblings, but the not all siblings are interesting). I can't add a parent class nor can I modify A, B, C, D. I want to do something like the below, but the syntax isn't legal.

private static final Class[] types = { A.class, B.class, C.class, D.class};
....
void method(Object cand) {
    for (Class c : types) {
        if (cand instanceof c) {//cand is interesting, but c isn't type
             ( (c) cand).methodInInterestingClasses();
        }
    }
}