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Classes in the java.util Package

• 1. java.util.List
   (15740)
  It has 33 commonly used methods.
• 2. java.util.ArrayList
   (14944)
  It has 34 commonly used methods.
• 3. java.util.Map
   (11939)
  It has 29 commonly used methods.
• 4. java.util.HashMap
   (11240)
  It has 27 commonly used methods.
• 5. java.util.Arrays
   (10440)
  It has 22 commonly used methods.
• 6. java.util.Collections
   (8943)
  It has 58 commonly used methods.
• 7. java.util.Set
   (8379)
  It has 25 commonly used methods.
• 8. java.util.Date
   (6986)
  It has 29 commonly used methods.
• 9. java.util.HashSet
   (6811)
  It has 19 commonly used methods.
• 10. java.util.Collection
   (6589)
  It has 22 commonly used methods.
• 11. java.util.Iterator
   (6507)
  It has 4 commonly used methods.
• 12. java.util.concurrent.TimeUnit
   (5957)
  It has 25 commonly used methods.
• 13. java.util.regex.Pattern
   (5731)
  It has 21 commonly used methods.
• 14. java.util.Random
   (4900)
  It has 9 commonly used methods.
• 15. java.util.Locale
   (4868)
  It has 57 commonly used methods.
• 16. java.util.regex.Matcher
   (4492)
  It has 21 commonly used methods.
• 17. java.util.LinkedList
   (4385)
  It has 42 commonly used methods.
• 18. java.util.Comparator
   (4258)
  It has 13 commonly used methods.
• 19. java.util.Properties
   (4053)
  It has 32 commonly used methods.
• 20. java.util.UUID
   (3943)
  It has 16 commonly used methods.
• 21. java.util.stream.Collectors
   (3684)
  It has 13 commonly used methods.
• 22. java.util.LinkedHashMap
   (3649)
  It has 19 commonly used methods.
• 23. java.util.concurrent.Executors
   (3638)
  It has 13 commonly used methods.
• 24. java.util.concurrent.ConcurrentHashMap
   (3537)
  It has 33 commonly used methods.
• 25. java.util.Objects
   (3443)
  It has 14 commonly used methods.
• 26. java.util.Calendar
   (3271)
  It has 85 commonly used methods.
• 27. java.util.concurrent.ExecutorService
   (3128)
  It has 11 commonly used methods.
• 28. java.util.concurrent.atomic.AtomicInteger
   (3117)
  It has 23 commonly used methods.
• 29. java.util.Map.Entry
   (2885)
  It has 7 commonly used methods.
• 30. java.util.Optional
   (2753)
  It has 17 commonly used methods.
• 31. java.util.Enumeration
   (2520)
  It has 4 commonly used methods.
• 32. java.util.TreeMap
   (2346)
  It has 38 commonly used methods.
• 33. java.util.concurrent.Callable
   (2273)
  It has 2 commonly used methods.
• 34. java.util.concurrent.ExecutionException
   (2253)
  It has 4 commonly used methods.
• 35. java.util.concurrent.atomic.AtomicBoolean
   (2235)
  It has 12 commonly used methods.
• 36. java.util.stream.Stream
   (2135)
  It has 34 commonly used methods.
• 37. java.util.function.Function
   (2107)
  It has 7 commonly used methods.
• 38. java.util.logging.Logger
   (2047)
  It has 31 commonly used methods.
• 39. java.util.concurrent.Future
   (1986)
  It has 4 commonly used methods.
• 40. java.util.TreeSet
   (1932)
  It has 29 commonly used methods.
• 41. java.util.LinkedHashSet
   (1896)
  It has 13 commonly used methods.
• 42. java.util.TimeZone
   (1793)
  It has 20 commonly used methods.
• 43. java.util.concurrent.CountDownLatch
   (1780)
  It has 3 commonly used methods.
• 44. java.util.concurrent.atomic.AtomicLong
   (1747)
  It has 17 commonly used methods.
• 45. java.util.Queue
   (1740)
  It has 15 commonly used methods.
• 46. java.util.logging.Level
   (1705)
  It has 13 commonly used methods.
• 47. java.util.function.Consumer
   (1683)
  It has 3 commonly used methods.
• 48. java.util.NoSuchElementException
   (1627)
  It has 4 commonly used methods.
• 49. java.util.concurrent.LinkedBlockingQueue
   (1522)
  It has 17 commonly used methods.
• 50. java.util.function.Supplier
   (1455)
  It has 2 commonly used methods.
• 51. java.util.concurrent.ScheduledExecutorService
   (1406)
  It has 11 commonly used methods.
• 52. java.util.concurrent.atomic.AtomicReference
   (1382)
  It has 11 commonly used methods.
• 53. java.util.Stack
   (1372)
  It has 29 commonly used methods.
• 54. java.util.TimerTask
   (1359)
  It has 3 commonly used methods.
• 55. java.util.concurrent.TimeoutException
   (1350)
  It has 3 commonly used methods.
• 56. java.util.zip.ZipEntry
   (1343)
  It has 29 commonly used methods.
• 57. java.util.Timer
   (1334)
  It has 4 commonly used methods.
• 58. java.util.Scanner
   (1321)
  It has 26 commonly used methods.
• 59. java.util.function.Predicate
   (1308)
  It has 6 commonly used methods.
• 60. java.util.concurrent.Executor
   (1292)
  It has 2 commonly used methods.
• 61. java.util.concurrent.BlockingQueue
   (1277)
  It has 17 commonly used methods.
• 62. java.util.concurrent.ThreadPoolExecutor
   (1274)
  It has 32 commonly used methods.
• 63. java.util.StringTokenizer
   (1273)
  It has 6 commonly used methods.
• 64. java.util.concurrent.ThreadFactory
   (1272)
  It has 1 commonly used methods.
• 65. java.util.EnumSet
   (1269)
  It has 21 commonly used methods.
• 66. java.util.concurrent.locks.ReentrantLock
   (1240)
  It has 12 commonly used methods.
• 67. java.util.Vector
   (1182)
  It has 35 commonly used methods.
• 68. java.util.concurrent.ConcurrentMap
   (1176)
  It has 22 commonly used methods.
• 69. java.util.concurrent.CopyOnWriteArrayList
   (1133)
  It has 15 commonly used methods.
• 70. java.util.Hashtable
   (1118)
  It has 23 commonly used methods.
• 71. java.util.Base64
   (1090)
  It has 8 commonly used methods.
• 72. java.util.ArrayDeque
   (1056)
  It has 30 commonly used methods.
• 73. java.util.ListIterator
   (1018)
  It has 10 commonly used methods.
• 74. java.util.stream.IntStream
   (1007)
  It has 13 commonly used methods.
• 75. java.util.concurrent.locks.Lock
   (999)
  It has 7 commonly used methods.
• 76. java.util.GregorianCalendar
   (967)
  It has 44 commonly used methods.
• 77. java.util.zip.GZIPInputStream
   (963)
  It has 5 commonly used methods.
• 78. java.util.Deque
   (951)
  It has 29 commonly used methods.
• 79. java.util.concurrent.ConcurrentLinkedQueue
   (921)
  It has 13 commonly used methods.
• 80. java.util.concurrent.CompletableFuture
   (914)
  It has 49 commonly used methods.
• 81. java.util.SortedMap
   (854)
  It has 24 commonly used methods.
• 82. java.util.ResourceBundle
   (823)
  It has 11 commonly used methods.
• 83. java.util.function.BiConsumer
   (795)
  It has 2 commonly used methods.
• 84. java.util.function.BiFunction
   (785)
  It has 2 commonly used methods.
• 85. java.util.SortedSet
   (781)
  It has 21 commonly used methods.
• 86. java.util.zip.GZIPOutputStream
   (737)
  It has 4 commonly used methods.
• 87. java.util.concurrent.ArrayBlockingQueue
   (734)
  It has 13 commonly used methods.
• 88. java.util.concurrent.locks.ReentrantReadWriteLock
   (732)
  It has 10 commonly used methods.
• 89. java.util.jar.JarFile
   (728)
  It has 13 commonly used methods.
• 90. java.util.zip.ZipFile
   (720)
  It has 9 commonly used methods.
• 91. java.util.WeakHashMap
   (716)
  It has 6 commonly used methods.
• 92. java.util.zip.ZipOutputStream
   (715)
  It has 10 commonly used methods.
• 93. java.util.EnumMap
   (707)
  It has 16 commonly used methods.
• 94. java.util.concurrent.ScheduledFuture
   (701)
  It has 5 commonly used methods.
• 95. java.util.concurrent.Semaphore
   (691)
  It has 8 commonly used methods.
• 96. java.util.jar.JarEntry
   (689)
  It has 25 commonly used methods.
• 97. java.util.concurrent.ThreadLocalRandom
   (685)
  It has 14 commonly used methods.
• 98. java.util.zip.ZipInputStream
   (680)
  It has 7 commonly used methods.
• 99. java.util.stream.StreamSupport
   (669)
  It has 4 commonly used methods.
• 100. java.util.BitSet
   (635)
  It has 24 commonly used methods.
• 101. java.util.AbstractMap
   (620)
  It has 9 commonly used methods.
• 102. java.util.ServiceLoader
   (598)
  It has 7 commonly used methods.
• 103. java.util.PriorityQueue
   (525)
  It has 16 commonly used methods.
• 104. java.util.concurrent.ScheduledThreadPoolExecutor
   (521)
  It has 24 commonly used methods.
• 105. java.util.regex.PatternSyntaxException
   (507)
  It has 6 commonly used methods.
• 106. java.util.concurrent.RejectedExecutionException
   (493)
  It has 3 commonly used methods.
• 107. java.util.concurrent.locks.ReadWriteLock
   (482)
  It has 2 commonly used methods.
• 108. java.util.concurrent.locks.Condition
   (481)
  It has 8 commonly used methods.
• 109. java.util.IdentityHashMap
   (480)
  It has 11 commonly used methods.
• 110. java.util.concurrent.FutureTask
   (429)
  It has 5 commonly used methods.
• 111. java.util.concurrent.CancellationException
   (427)
  It has 1 commonly used methods.
• 112. java.util.Formatter
   (407)
  It has 7 commonly used methods.
• 113. java.util.concurrent.CopyOnWriteArraySet
   (402)
  It has 5 commonly used methods.
• 114. java.util.concurrent.LinkedBlockingDeque
   (398)
  It has 25 commonly used methods.
• 115. java.util.jar.Manifest
   (392)
  It has 6 commonly used methods.
• 116. java.util.MissingResourceException
   (384)
  It has 4 commonly used methods.
• 117. java.util.zip.CRC32
   (370)
  It has 3 commonly used methods.
• 118. java.util.ConcurrentModificationException
   (363)
  It has 1 commonly used methods.
• 119. java.util.zip.Deflater
   (363)
  It has 17 commonly used methods.
• 120. java.util.EventListener
   (356)
  It has 0 commonly used methods.
• 121. java.util.StringJoiner
   (353)
  It has 5 commonly used methods.
• 122. java.util.AbstractList
   (351)
  It has 6 commonly used methods.
• 123. java.util.AbstractSet
   (339)
  It has 0 commonly used methods.
• 124. java.util.zip.Inflater
   (335)
  It has 8 commonly used methods.
• 125. java.util.logging.LogRecord
   (330)
  It has 25 commonly used methods.
• 126. java.util.concurrent.SynchronousQueue
   (329)
  It has 9 commonly used methods.
• 127. java.util.jar.Attributes
   (318)
  It has 14 commonly used methods.
• 128. java.util.logging.Handler
   (301)
  It has 8 commonly used methods.
• 129. java.util.Spliterator
   (299)
  It has 19 commonly used methods.
• 130. java.util.concurrent.ConcurrentSkipListMap
   (280)
  It has 23 commonly used methods.
• 131. java.util.EventObject
   (277)
  It has 1 commonly used methods.
• 132. java.util.NavigableMap
   (267)
  It has 31 commonly used methods.
• 133. java.util.concurrent.ForkJoinPool
   (264)
  It has 19 commonly used methods.
• 134. java.util.stream.Collector
   (261)
  It has 6 commonly used methods.
• 135. java.util.concurrent.ConcurrentSkipListSet
   (256)
  It has 14 commonly used methods.
• 136. java.util.zip.InflaterInputStream
   (253)
  It has 2 commonly used methods.
• 137. java.util.AbstractCollection
   (249)
  It has 5 commonly used methods.
• 138. java.util.jar.JarOutputStream
   (245)
  It has 9 commonly used methods.
• 139. java.util.concurrent.CyclicBarrier
   (242)
  It has 4 commonly used methods.
• 140. java.util.function.BiPredicate
   (238)
  It has 2 commonly used methods.
• 141. java.util.zip.DeflaterOutputStream
   (238)
  It has 4 commonly used methods.
• 142. java.util.function.UnaryOperator
   (234)
  It has 2 commonly used methods.
• 143. java.util.function.BinaryOperator
   (222)
  It has 1 commonly used methods.
• 144. java.util.zip.ZipException
   (222)
  It has 2 commonly used methods.
• 145. java.util.prefs.Preferences
   (221)
  It has 31 commonly used methods.
• 146. java.util.concurrent.ConcurrentLinkedDeque
   (220)
  It has 21 commonly used methods.
• 147. java.util.concurrent.RejectedExecutionHandler
   (220)
  It has 1 commonly used methods.
• 148. java.util.logging.LogManager
   (218)
  It has 9 commonly used methods.
• 149. java.util.concurrent.CompletionStage
   (217)
  It has 17 commonly used methods.
• 150. java.util.zip.DataFormatException
   (217)
  It has 2 commonly used methods.
• 151. java.util.concurrent.PriorityBlockingQueue
   (216)
  It has 12 commonly used methods.
• 152. java.util.Spliterators
   (213)
  It has 11 commonly used methods.
• 153. java.util.Observable
   (201)
  It has 4 commonly used methods.
• 154. java.util.NavigableSet
   (200)
  It has 24 commonly used methods.
• 155. java.util.stream.LongStream
   (198)
  It has 10 commonly used methods.
• 156. java.util.AbstractMap.SimpleEntry
   (187)
  It has 3 commonly used methods.
• 157. java.util.concurrent.locks.LockSupport
   (186)
  It has 6 commonly used methods.
• 158. java.util.concurrent.CompletionException
   (185)
  It has 1 commonly used methods.
• 159. java.util.OptionalInt
   (182)
  It has 11 commonly used methods.
• 160. java.util.jar.JarInputStream
   (179)
  It has 7 commonly used methods.
• 161. java.util.Observer
   (175)
  It has 1 commonly used methods.
• 162. java.util.logging.Formatter
   (173)
  It has 2 commonly used methods.
• 163. java.util.concurrent.atomic.LongAdder
   (165)
  It has 8 commonly used methods.
• 164. java.util.function.IntFunction
   (165)
  It has 1 commonly used methods.
• 165. java.util.RandomAccess
   (165)
  It has 0 commonly used methods.
• 166. java.util.concurrent.BrokenBarrierException
   (159)
  It has 0 commonly used methods.
• 167. java.util.Currency
   (159)
  It has 7 commonly used methods.
• 168. java.util.logging.FileHandler
   (151)
  It has 8 commonly used methods.
• 169. java.util.Dictionary
   (148)
  It has 7 commonly used methods.
• 170. java.util.function.BooleanSupplier
   (147)
  It has 2 commonly used methods.
• 171. java.util.logging.ConsoleHandler
   (143)
  It has 4 commonly used methods.
• 172. java.util.concurrent.ExecutorCompletionService
   (139)
  It has 3 commonly used methods.
• 173. java.util.concurrent.Delayed
   (138)
  It has 2 commonly used methods.
• 174. java.util.logging.SimpleFormatter
   (137)
  It has 1 commonly used methods.
• 175. java.util.zip.Checksum
   (128)
  It has 3 commonly used methods.
• 176. java.util.EmptyStackException
   (124)
  It has 0 commonly used methods.
• 177. java.util.stream.DoubleStream
   (120)
  It has 10 commonly used methods.
• 178. java.util.AbstractQueue
   (113)
  It has 2 commonly used methods.
• 179. java.util.PropertyResourceBundle
   (113)
  It has 5 commonly used methods.
• 180. java.util.function.IntConsumer
   (111)
  It has 2 commonly used methods.
• 181. java.util.prefs.BackingStoreException
   (110)
  It has 1 commonly used methods.
• 182. java.util.AbstractMap.SimpleImmutableEntry
   (109)
  It has 1 commonly used methods.
• 183. java.util.function.ToIntFunction
   (109)
  It has 1 commonly used methods.
• 184. java.util.OptionalLong
   (109)
  It has 11 commonly used methods.
• 185. java.util.concurrent.atomic.AtomicReferenceArray
   (108)
  It has 13 commonly used methods.
• 186. java.util.concurrent.RunnableFuture
   (107)
  It has 4 commonly used methods.
• 187. java.util.concurrent.atomic.AtomicReferenceFieldUpdater
   (105)
  It has 8 commonly used methods.
• 188. java.util.regex.MatchResult
   (104)
  It has 4 commonly used methods.
• 189. java.util.concurrent.atomic.AtomicIntegerFieldUpdater
   (102)
  It has 10 commonly used methods.
• 190. java.util.concurrent.BlockingDeque
   (95)
  It has 4 commonly used methods.
• 191. java.util.concurrent.CompletionService
   (95)
  It has 3 commonly used methods.
• 192. java.util.SimpleTimeZone
   (95)
  It has 8 commonly used methods.
• 193. java.util.concurrent.DelayQueue
   (93)
  It has 13 commonly used methods.
• 194. java.util.function.IntPredicate
   (91)
  It has 2 commonly used methods.
• 195. java.util.ServiceConfigurationError
   (90)
  It has 2 commonly used methods.
• 196. java.util.concurrent.AbstractExecutorService
   (88)
  It has 0 commonly used methods.
• 197. java.util.concurrent.locks.AbstractQueuedSynchronizer
   (86)
  It has 1 commonly used methods.
• 198. java.util.OptionalDouble
   (83)
  It has 7 commonly used methods.
• 199. java.util.function.ToLongFunction
   (82)
  It has 1 commonly used methods.
• 200. java.util.function.ToDoubleFunction
   (81)
  It has 1 commonly used methods.
• 201. java.util.function.IntSupplier
   (80)
  It has 1 commonly used methods.
• 202. java.util.function.LongSupplier
   (79)
  It has 1 commonly used methods.
• 203. java.util.zip.Adler32
   (77)
  It has 3 commonly used methods.
• 204. java.util.concurrent.ConcurrentNavigableMap
   (76)
  It has 26 commonly used methods.
• 205. java.util.concurrent.atomic.AtomicLongFieldUpdater
   (74)
  It has 7 commonly used methods.
• 206. java.util.concurrent.ForkJoinTask
   (73)
  It has 7 commonly used methods.
• 207. java.util.concurrent.LinkedTransferQueue
   (73)
  It has 15 commonly used methods.
• 208. java.util.concurrent.Phaser
   (70)
  It has 11 commonly used methods.
• 209. java.util.function.LongConsumer
   (68)
  It has 1 commonly used methods.
• 210. java.util.concurrent.atomic.AtomicIntegerArray
   (67)
  It has 14 commonly used methods.
• 211. java.util.concurrent.atomic.AtomicLongArray
   (67)
  It has 13 commonly used methods.
• 212. java.util.concurrent.RecursiveTask
   (67)
  It has 4 commonly used methods.
• 213. java.util.IllegalFormatException
   (67)
  It has 1 commonly used methods.
• 214. java.util.PrimitiveIterator
   (63)
  It has 3 commonly used methods.
• 215. java.util.logging.Filter
   (62)
  It has 1 commonly used methods.
• 216. java.util.concurrent.locks.StampedLock
   (60)
  It has 15 commonly used methods.
• 217. java.util.function.IntUnaryOperator
   (58)
  It has 3 commonly used methods.
• 218. java.util.logging.StreamHandler
   (58)
  It has 2 commonly used methods.
• 219. java.util.concurrent.Exchanger
   (57)
  It has 1 commonly used methods.
• 220. java.util.zip.CheckedOutputStream
   (57)
  It has 3 commonly used methods.
• 221. java.util.ListResourceBundle
   (56)
  It has 2 commonly used methods.
• 222. java.util.IntSummaryStatistics
   (55)
  It has 5 commonly used methods.
• 223. java.util.AbstractSequentialList
   (54)
  It has 2 commonly used methods.
• 224. java.util.function.DoubleFunction
   (54)
  It has 1 commonly used methods.
• 225. java.util.function.DoubleConsumer
   (53)
  It has 2 commonly used methods.
• 226. java.util.function.DoubleUnaryOperator
   (53)
  It has 2 commonly used methods.
• 227. java.util.function.LongFunction
   (53)
  It has 1 commonly used methods.
• 228. java.util.function.DoubleSupplier
   (52)
  It has 1 commonly used methods.
• 229. java.util.InvalidPropertiesFormatException
   (52)
  It has 0 commonly used methods.
• 230. java.util.jar.Attributes.Name
   (50)
  It has 5 commonly used methods.
• 231. java.util.concurrent.RecursiveAction
   (49)
  It has 0 commonly used methods.
• 232. java.util.PropertyPermission
   (48)
  It has 1 commonly used methods.
• 233. java.util.TooManyListenersException
   (48)
  It has 1 commonly used methods.
• 234. java.util.zip.CheckedInputStream
   (48)
  It has 2 commonly used methods.
• 235. java.util.concurrent.locks.ReentrantReadWriteLock.WriteLock
   (47)
  It has 4 commonly used methods.
• 236. java.util.DoubleSummaryStatistics
   (46)
  It has 5 commonly used methods.
• 237. java.util.LongSummaryStatistics
   (45)
  It has 4 commonly used methods.
• 238. java.util.Base64.Encoder
   (44)
  It has 2 commonly used methods.
• 239. java.util.concurrent.locks.ReentrantReadWriteLock.ReadLock
   (44)
  It has 3 commonly used methods.
• 240. java.util.InputMismatchException
   (44)
  It has 0 commonly used methods.
• 241. java.util.function.DoubleBinaryOperator
   (43)
  It has 1 commonly used methods.
• 242. java.util.function.IntBinaryOperator
   (43)
  It has 1 commonly used methods.
• 243. java.util.concurrent.ForkJoinWorkerThread
   (40)
  It has 1 commonly used methods.
• 244. java.util.Base64.Decoder
   (39)
  It has 1 commonly used methods.
• 245. java.util.function.LongPredicate
   (39)
  It has 1 commonly used methods.
• 246. java.util.function.ObjIntConsumer
   (39)
  It has 1 commonly used methods.
• 247. java.util.MissingFormatArgumentException
   (39)
  It has 2 commonly used methods.
• 248. java.util.ResourceBundle.Control
   (38)
  It has 4 commonly used methods.
• 249. java.util.function.LongUnaryOperator
   (37)
  It has 1 commonly used methods.
• 250. java.util.Formattable
   (36)
  It has 1 commonly used methods.
• 251. java.util.zip.InflaterOutputStream
   (36)
  It has 2 commonly used methods.
• 252. java.util.function.DoublePredicate
   (35)
  It has 1 commonly used methods.
• 253. java.util.SplittableRandom
   (35)
  It has 5 commonly used methods.
• 254. java.util.function.LongBinaryOperator
   (33)
  It has 1 commonly used methods.
• 255. java.util.concurrent.atomic.LongAccumulator
   (32)
  It has 3 commonly used methods.
• 256. java.util.function.IntToDoubleFunction
   (31)
  It has 1 commonly used methods.
• 257. java.util.concurrent.atomic.DoubleAdder
   (28)
  It has 4 commonly used methods.
• 258. java.util.jar.Pack200
   (28)
  It has 4 commonly used methods.
• 259. java.util.IllformedLocaleException
   (27)
  It has 0 commonly used methods.
• 260. java.util.prefs.AbstractPreferences
   (27)
  It has 0 commonly used methods.
• 261. java.util.prefs.PreferenceChangeEvent
   (27)
  It has 3 commonly used methods.
• 262. java.util.concurrent.atomic.AtomicMarkableReference
   (25)
  It has 3 commonly used methods.
• 263. java.util.prefs.PreferenceChangeListener
   (25)
  It has 0 commonly used methods.
• 264. java.util.function.IntToLongFunction
   (24)
  It has 1 commonly used methods.
• 265. java.util.concurrent.CountedCompleter
   (23)
  It has 2 commonly used methods.
• 266. java.util.concurrent.RunnableScheduledFuture
   (23)
  It has 4 commonly used methods.
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• 268. java.util.function.ObjLongConsumer
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• 269. java.util.concurrent.ForkJoinPool.ForkJoinWorkerThreadFactory
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