Java Generics Puzzler, extending a class and using wildcards

Question

I\'ve been beating my head against this one for awhile and thought that maybe some fresh eyes will see the issue; thanks for your time.

import java.util.*;

clas         


        

Answer 1

You're using a bounded wildcard (TbinList> ...). This wildcard will prevent you from adding any elements to the list. If you want more info, heres the section about Wildcards in the docs.