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Answers and rating deltas for

Whats the use of saying <? extends SomeObject> instead of <SomeObject>

Author Votes Δ
Aniket Thakur 17 +1.28
Philipp Sander 2 +0.97
Kannan Ekanath 2 +0.26
Anirudha 0 -1.14
Sid -2 -4.14
Last visited: Sep 14, 2014, 5:07:29 AM