object Random extends Random
The object Random
offers a default implementation
of scala.util.Random and random-related convenience methods.
- Source
- Random.scala
- Since
2.8
- Alphabetic
- By Inheritance
- Random
- Random
- Serializable
- Serializable
- AnyRef
- Any
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Value Members
-
def
alphanumeric: collection.immutable.Stream[Char]
Returns a Stream of pseudorandomly chosen alphanumeric characters, equally chosen from A-Z, a-z, and 0-9.
Returns a Stream of pseudorandomly chosen alphanumeric characters, equally chosen from A-Z, a-z, and 0-9.
- Definition Classes
- Random
- Since
2.8
- implicit def javaRandomToRandom(r: java.util.Random): Random
-
def
nextBoolean(): Boolean
Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.
Returns the next pseudorandom, uniformly distributed boolean value from this random number generator's sequence.
- Definition Classes
- Random
-
def
nextBytes(bytes: Array[Byte]): Unit
Generates random bytes and places them into a user-supplied byte array.
Generates random bytes and places them into a user-supplied byte array.
- Definition Classes
- Random
-
def
nextDouble(): Double
Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.
Returns the next pseudorandom, uniformly distributed double value between 0.0 and 1.0 from this random number generator's sequence.
- Definition Classes
- Random
-
def
nextFloat(): Float
Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.
Returns the next pseudorandom, uniformly distributed float value between 0.0 and 1.0 from this random number generator's sequence.
- Definition Classes
- Random
-
def
nextGaussian(): Double
Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence.
Returns the next pseudorandom, Gaussian ("normally") distributed double value with mean 0.0 and standard deviation 1.0 from this random number generator's sequence.
- Definition Classes
- Random
-
def
nextInt(n: Int): Int
Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
Returns a pseudorandom, uniformly distributed int value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.
- Definition Classes
- Random
-
def
nextInt(): Int
Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence.
Returns the next pseudorandom, uniformly distributed int value from this random number generator's sequence.
- Definition Classes
- Random
-
def
nextLong(): Long
Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence.
Returns the next pseudorandom, uniformly distributed long value from this random number generator's sequence.
- Definition Classes
- Random
-
def
nextPrintableChar(): Char
Returns the next pseudorandom, uniformly distributed value from the ASCII range 33-126.
Returns the next pseudorandom, uniformly distributed value from the ASCII range 33-126.
- Definition Classes
- Random
-
def
nextString(length: Int): String
Returns a pseudorandomly generated String.
Returns a pseudorandomly generated String. This routine does not take any measures to preserve the randomness of the distribution in the face of factors like unicode's variable-length encoding, so please don't use this for anything important. It's primarily intended for generating test data.
- length
the desired length of the String
- returns
the String
- Definition Classes
- Random
-
val
self: java.util.Random
- Definition Classes
- Random
-
def
setSeed(seed: Long): Unit
- Definition Classes
- Random
-
def
shuffle[T, CC[X] <: TraversableOnce[X]](xs: CC[T])(implicit bf: CanBuildFrom[CC[T], T, CC[T]]): CC[T]
Returns a new collection of the same type in a randomly chosen order.
Returns a new collection of the same type in a randomly chosen order.
- returns
the shuffled collection
- Definition Classes
- Random
This is the documentation for the Scala standard library.
Package structure
The scala package contains core types like
Int
,Float
,Array
orOption
which are accessible in all Scala compilation units without explicit qualification or imports.Notable packages include:
scala.collection
and its sub-packages contain Scala's collections frameworkscala.collection.immutable
- Immutable, sequential data-structures such asVector
,List
,Range
,HashMap
orHashSet
scala.collection.mutable
- Mutable, sequential data-structures such asArrayBuffer
,StringBuilder
,HashMap
orHashSet
scala.collection.concurrent
- Mutable, concurrent data-structures such asTrieMap
scala.collection.parallel.immutable
- Immutable, parallel data-structures such asParVector
,ParRange
,ParHashMap
orParHashSet
scala.collection.parallel.mutable
- Mutable, parallel data-structures such asParArray
,ParHashMap
,ParTrieMap
orParHashSet
scala.concurrent
- Primitives for concurrent programming such asFutures
andPromises
scala.io
- Input and output operationsscala.math
- Basic math functions and additional numeric types likeBigInt
andBigDecimal
scala.sys
- Interaction with other processes and the operating systemscala.util.matching
- Regular expressionsOther packages exist. See the complete list on the right.
Additional parts of the standard library are shipped as separate libraries. These include:
scala.reflect
- Scala's reflection API (scala-reflect.jar)scala.xml
- XML parsing, manipulation, and serialization (scala-xml.jar)scala.swing
- A convenient wrapper around Java's GUI framework called Swing (scala-swing.jar)scala.util.parsing
- Parser combinators (scala-parser-combinators.jar)Automatic imports
Identifiers in the scala package and the
scala.Predef
object are always in scope by default.Some of these identifiers are type aliases provided as shortcuts to commonly used classes. For example,
List
is an alias forscala.collection.immutable.List
.Other aliases refer to classes provided by the underlying platform. For example, on the JVM,
String
is an alias forjava.lang.String
.