# Hierarchy For Package org.apache.lucene.util

Package Hierarchies:

- All Packages

## Class Hierarchy

- java.lang.Object
  - org.apache.lucene.util.ArrayUtil
  - org.apache.lucene.util.AttributeImpl (implements org.apache.lucene.util.Attribute, java.lang.Cloneable)
  - org.apache.lucene.util.AttributeSource
  - org.apache.lucene.util.AttributeSource.AttributeFactory
  - org.apache.lucene.util.AttributeSource.State (implements java.lang.Cloneable)
  - org.apache.lucene.util.Bits.MatchAllBits (implements org.apache.lucene.util.Bits)
  - org.apache.lucene.util.Bits.MatchNoBits (implements org.apache.lucene.util.Bits)
  - org.apache.lucene.util.BitUtil
  - org.apache.lucene.util.ByteBlockPool
  - org.apache.lucene.util.ByteBlockPool.Allocator
    - org.apache.lucene.util.ByteBlockPool.DirectAllocator
    - org.apache.lucene.util.ByteBlockPool.DirectTrackingAllocator
    - org.apache.lucene.util.RecyclingByteBlockAllocator
  - org.apache.lucene.util.BytesRef (implements java.lang.Cloneable, java.lang.Comparable<T>)
  - org.apache.lucene.util.BytesRefHash
  - org.apache.lucene.util.BytesRefHash.BytesStartArray
    - org.apache.lucene.util.BytesRefHash.DirectBytesStartArray
  - org.apache.lucene.util.CharsRef (implements java.lang.CharSequence, java.lang.Cloneable, java.lang.Comparable<T>)
  - org.apache.lucene.util.CloseableThreadLocal<T> (implements java.io.Closeable)
  - org.apache.lucene.util.CollectionUtil
  - org.apache.lucene.util.CommandLineUtil
  - org.apache.lucene.util.Constants
  - org.apache.lucene.util.Counter
  - org.apache.lucene.store.DataInput (implements java.lang.Cloneable)
    - org.apache.lucene.util.PagedBytes.PagedBytesDataInput
  - org.apache.lucene.store.DataOutput
    - org.apache.lucene.util.PagedBytes.PagedBytesDataOutput
  - org.apache.lucene.search.DocIdSet
    - org.apache.lucene.util.DocIdBitSet (implements org.apache.lucene.util.Bits)
    - org.apache.lucene.util.FixedBitSet (implements org.apache.lucene.util.Bits)
    - org.apache.lucene.util.OpenBitSet (implements org.apache.lucene.util.Bits, java.lang.Cloneable)
      - org.apache.lucene.util.OpenBitSetDISI
  - org.apache.lucene.search.DocIdSetIterator
    - org.apache.lucene.util.OpenBitSetIterator
  - org.apache.lucene.util.DoubleBarrelLRUCache<K,V>
  - org.apache.lucene.util.DoubleBarrelLRUCache.CloneableKey
  - org.apache.lucene.util.FieldCacheSanityChecker
  - org.apache.lucene.util.FieldCacheSanityChecker.Insanity
  - org.apache.lucene.util.FieldCacheSanityChecker.InsanityType
  - org.apache.lucene.util.FilterIterator<T> (implements java.util.Iterator<E>)
  - org.apache.lucene.util.IndexableBinaryStringTools
  - org.apache.lucene.util.InfoStream (implements java.io.Closeable)
    - org.apache.lucene.util.PrintStreamInfoStream
  - org.apache.lucene.util.IntBlockPool
  - org.apache.lucene.util.IntBlockPool.Allocator
    - org.apache.lucene.util.IntBlockPool.DirectAllocator
    - org.apache.lucene.util.RecyclingIntBlockAllocator
  - org.apache.lucene.util.IntBlockPool.SliceReader
  - org.apache.lucene.util.IntBlockPool.SliceWriter
  - org.apache.lucene.util.IntsRef (implements java.lang.Cloneable, java.lang.Comparable<T>)
  - org.apache.lucene.util.IOUtils
  - org.apache.lucene.util.LongsRef (implements java.lang.Cloneable, java.lang.Comparable<T>)
  - org.apache.lucene.util.MapOfSets<K,V>
  - org.apache.lucene.util.MathUtil
  - org.apache.lucene.util.NamedSPILoader<S> (implements java.lang.Iterable<T>)
  - org.apache.lucene.util.NamedThreadFactory (implements java.util.concurrent.ThreadFactory)
  - org.apache.lucene.util.NumericUtils
  - org.apache.lucene.util.NumericUtils.IntRangeBuilder
  - org.apache.lucene.util.NumericUtils.LongRangeBuilder
  - org.apache.lucene.util.PagedBytes
  - org.apache.lucene.util.PagedBytes.Reader
  - org.apache.lucene.util.PriorityQueue<T>
  - org.apache.lucene.util.RamUsageEstimator
  - org.apache.lucene.util.RollingBuffer<T>
  - org.apache.lucene.util.SentinelIntSet
  - org.apache.lucene.util.SetOnce<T>
  - org.apache.lucene.util.SmallFloat
  - org.apache.lucene.util.SorterTemplate
  - org.apache.lucene.util.SPIClassIterator<S> (implements java.util.Iterator<E>)
  - org.apache.lucene.util.StringHelper
  - java.lang.Throwable (implements java.io.Serializable)
    - java.lang.Exception
      - java.lang.RuntimeException
        - org.apache.lucene.util.BytesRefHash.MaxBytesLengthExceededException
        - java.lang.IllegalStateException
          - org.apache.lucene.util.SetOnce.AlreadySetException
        - org.apache.lucene.util.ThreadInterruptedException
  - org.apache.lucene.util.ToStringUtils
  - org.apache.lucene.util.UnicodeUtil
  - org.apache.lucene.util.VirtualMethod<C>
  - org.apache.lucene.util.WeakIdentityMap<K,V>

## Interface Hierarchy

- org.apache.lucene.util.Attribute
- org.apache.lucene.util.AttributeReflector
- org.apache.lucene.util.Bits
  - org.apache.lucene.util.MutableBits
- org.apache.lucene.util.BytesRefIterator
- org.apache.lucene.util.NamedSPILoader.NamedSPI
- org.apache.lucene.util.RollingBuffer.Resettable

## Enum Hierarchy

- java.lang.Object
  - java.lang.Enum<E> (implements java.lang.Comparable<T>, java.io.Serializable)
    - org.apache.lucene.util.Version
    - org.apache.lucene.util.RamUsageEstimator.JvmFeature