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 can define the generic types as follows:

class Tbin extends ArrayList {}
class TbinList> extends ArrayList {}

Then you would create instance like:

TbinList> test2 = new TbinList<>();
test2.add(new Tbin());