Add Strings through use of generic 'extends' causes compiler error

Question

Below code :

List genericNames = new ArrayList();
genericNames.add(\"John\");

Gives compiler error :

Answer 1

String is a final class and cannot be extended. Additionally, for the case you seem to be interested in, you do not need the extends keyword. List will do what you seem to want. That will allow Strings and sub-classes of String (if such a thing could exist, which it can't since String is final).