Question concerning SCJP-6 exam
- by abatishchev
While preparing for the SCJP-6 exam I faced with a difficult issue. I can’t find answer by myself. Please, answer for the question and give short comments:
abstract class A<K> extends Number> {
// insert code here
}
public abstract <K> A<? extends Number> useMe(A<? super K> k);
public abstract <K> A<? super Number> useMe(A<? extends K> k);
public abstract <K> A<K> useMe(A<K> k);
public abstract <V extends K> A<V> useMe(A<V> k);
public abstract <V super K> A<V> useMe(A<V> k);
public abstract <V extends Character> A<? super V> useMe(A<K> k);
public abstract <V super Character> A<? super V> useMe(A<K> k);
Which method can be inserted in a placeholder above?
P.S.
I tried to look on the specification. Those one was not helpful for me.
