About Question enthuware.ocpjp.v7.2.1507 :

[tn1408]

Hello,
How do we assume that TC is a top level class?

Thanks,

Tony,

[admin]

Because the code listing makes it clear that it is.

[shamran99]

Hi,

Wanted to know that what could be the reason for making collection classes non final. I know it is to allow extending that class. But are there any specific reason for that?

Regards,
Shamran.

[admin]

The reason is same as for making any other class non-final. So that one could extend them and customize the functionality if they want to.