Generic method in Java, syntax

Question

What is happening in line 6? <C extends Cat> is the return type of useMe, right? What does <? super Dog> do?

2. class Animal { }
3. class Dog extends Animal { }
4. class Cat extends Animal { }
5. public class Mixer<A extends Animal> {
6. public <C extends Cat> Mixer<? super Dog> useMe(A a, C c) {
7. //Some code
8. } }    

Answer 1

The <C extends Cat> specifies that useMe has one generic parameter, C, which must extend Cat.

Its return type is Mixer<? super Dog>. The ? denotes a wildcard.