Improve JAR parsing performance #442
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When using
diff --jaron large JARs (~500 000 members) the process would take hours to finish.referencedMembers -= declaredMembersis where all the time was spent.This actually does
AbstractSet#removeAll()which callsdeclaredMembers.contains()for each element ofreferencedMembers.List.contains()is O(n) vs O(1) forSet.contains(), so the whole operation would be O(n^2) instead of O(n).