I don't understand that error, but I can tell you that this isn't correct:
OrderSet<String> s1 = new OrderSet<>();
That you can't use empty generic parameter brackets. Better to do:
Type: Posts; User: Fubarable
Re: having problem declaring a generic type array in OrderSet class
I don't understand that error, but I can tell you that this isn't correct:
OrderSet<String> s1 = new OrderSet<>();
That you can't use empty generic parameter brackets. Better to do: