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Answers and rating deltas for

Why am I getting this error when using add() and getFirst() for a LinkedList?

Author Votes Δ
Adrian 1 +1.19
KyleM 1 +3.20
Peter Lawrey 0 -0.88
emd 0 -1.47
Lucas 0 -0.53
Last visited: Sep 14, 2014, 5:07:29 AM