gamoder.java

   public static void main(String[] outsideArgs) {

        Test<Collection<Integer>, List<Integer>> t = test();
        Collection<Integer> a = t.getA();
        List<Integer> b = t.getB();
    }

    public static class Test<A, B> {
        A getA() {
            return null;
        }

        B getB() {
           return null;
        }
    }

    public static <U> Test<Collection<U>, List<U>> test() {
        return new Test<Collection<U>, List<U>>() {
        };
    }