gistfile1.java

public class App {
    public interface A {
        B foo();
    }
    public static class B {
        B foo() { return null; }
    }
    public static class C implements A {
        private int x;
        public void baz(B b) {}
        protected void baz(D d) {}
        private static void garply() {}
        public B foo() { return null; }
    }
    public static class D extends B {
        public static double y;
        public void qux(A a) { ((C)a).baz(null); }
    }
    public static class E {
        protected C z;
        //itt még van valami Map<String, F>-es bohóckodás
        public static void grault(E e) {}
    }
    public class F extends D {
        public void bar(D d) {}
        public void corge() {}
    }
    public static void main(String[] args) {
        D d = new D();
        d.qux(new C());
    }
}