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Answers and rating deltas for

I need some help to understand this code in java

Author Votes Δ
Dan 2 +3.88
Jozcar 1 +2.66
mad4j 0 -1.34
cylon 0 -1.24
Mathews Mathai 0 -1.15
SMA 0 -0.18
John Scattergood 0 -1.33
Last visited: Mar 19, 2016, 4:59:30 PM