About Question enthuware.ocpjp.ii.v11.2.3312 :

[lexlexych]

Code: Select all

List<? extends Booby> bV = null;
List<? super Dooby> dV = null;

dV.add(new Dooby(){ });   // -> NullPointerException
bV.add(new Dooby(){ });   // -> NullPointerException

How can dV.add(new Dooby(){ }); be the correct answer?

[admin]

You are right. It has been updated as follows to make it clear:

List<? extends Booby> bV = //code for initialization
List<? super Dooby> dV = //code for initialization

thank you for your feedback!