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Programmer Certification (SCJP/OCPJP)
Joined: May 05, 2010
May 23, 2010 07:31:03
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Given this code fragment what can be added to the list ?
Assume that Toll is an empty class and all imports have been made
List <? super Toll> list = new ArrayList<Toll>();
2 options are correct--
--The answers are toll can be added and
--the subclass of toll can be added..
but the second option is wrong according to me
superclass of toll can be added must be the 2nd option;;
am i right???
Thanks & Regards,
Joined: Mar 24, 2008
May 23, 2010 08:19:51
You can add instances of "Toll" or any subtypes of it in to the list. What "<? super Toll>" in the reference declaration says that the type of the actual List would be of "Toll" or anything above that.
SCJP 5 | SCWCD 5
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