org.apache.lucene.util
Classes 
ArrayUtil
BitUtil
BitVector
CloseableThreadLocal
Constants
DocIdBitSet
OpenBitSet
OpenBitSetDISI
OpenBitSetIterator
Parameter
PriorityQueue
ScorerDocQueue
SmallFloat
SortedVIntList
StringHelper
ToStringUtils
UnicodeUtil
UnicodeUtil.UTF16Result
UnicodeUtil.UTF8Result