Packages

object Random extends Random

The object Random offers a default implementation of scala.util.Random and random-related convenience methods.

Source
Random.scala
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  1. Random
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Value Members

  1. final def !=(arg0: Any): Boolean

    Test two objects for inequality.

    Test two objects for inequality.

    returns

    true if !(this == that), false otherwise.

    Definition Classes
    AnyRef → Any
  2. final def ##: Int

    Equivalent to x.hashCode except for boxed numeric types and null.

    Equivalent to x.hashCode except for boxed numeric types and null. For numerics, it returns a hash value which is consistent with value equality: if two value type instances compare as true, then ## will produce the same hash value for each of them. For null returns a hashcode where null.hashCode throws a NullPointerException.

    returns

    a hash value consistent with ==

    Definition Classes
    AnyRef → Any
  3. final def ==(arg0: Any): Boolean

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    The expression x == that is equivalent to if (x eq null) that eq null else x.equals(that).

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    AnyRef → Any
  4. def alphanumeric: collection.immutable.LazyList[Char]

    Returns a LazyList of pseudorandomly chosen alphanumeric characters, equally chosen from A-Z, a-z, and 0-9.

    Returns a LazyList of pseudorandomly chosen alphanumeric characters, equally chosen from A-Z, a-z, and 0-9.

    Definition Classes
    Random
    Annotations
    @migration
    Migration

    (Changed in version 2.13.0) alphanumeric returns a LazyList instead of a Stream

  5. final def asInstanceOf[T0]: T0

    Forces the compiler to treat the receiver object as having type T0, even though doing so may violate type safety.

    Forces the compiler to treat the receiver object as having type T0, even though doing so may violate type safety.

    This method is useful when you believe you have type information the compiler doesn't, and it also isn't possible to check the type at runtime. In such situations, skipping type safety is the only option.

    It is platform dependent whether asInstanceOf has any effect at runtime. It might do a runtime type test on the erasure of T0, insert a conversion (such as boxing/unboxing), fill in a default value, or do nothing at all.

    In particular, asInstanceOf is not a type test. It does **not** mean:

    this match {
     case x: T0 => x
     case _     => throw ClassCastException("...")

    Use pattern matching or isInstanceOf for type testing instead.

    Situations where asInstanceOf is useful:

    • when flow analysis fails to deduce T0 automatically
    • when down-casting a type parameter or an abstract type member (which cannot be checked at runtime due to type erasure) If there is any doubt and you are able to type test instead, you should do so.

    Be careful of using asInstanceOf when T0 is a primitive type. When T0 is primitive, asInstanceOf may insert a conversion instead of a type test. If your intent is to convert, use a toT method (x.toChar, x.toByte, etc.).

    returns

    the receiver object.

    Definition Classes
    Any
    Exceptions thrown

    ClassCastException if the receiver is not an instance of the erasure of T0, if that can be checked on this platform

  6. def between(minInclusive: Long, maxExclusive: Long): Long

    Returns a pseudorandom, uniformly distributed long value between min (inclusive) and the specified value max (exclusive), drawn from this random number generator's sequence.

    Returns a pseudorandom, uniformly distributed long value between min (inclusive) and the specified value max (exclusive), drawn from this random number generator's sequence.

    Definition Classes
    Random
  7. def between(minInclusive: Int, maxExclusive: Int): Int

    Returns a pseudorandom, uniformly distributed int value between min (inclusive) and the specified value max (exclusive), drawn from this random number generator's sequence.

    Returns a pseudorandom, uniformly distributed int value between min (inclusive) and the specified value max (exclusive), drawn from this random number generator's sequence.

    Definition Classes
    Random
  8. def between(minInclusive: Float, maxExclusive: Float): Float

    Returns the next pseudorandom, uniformly distributed float value between min (inclusive) and max (exclusive) from this random number generator's sequence.

    Returns the next pseudorandom, uniformly distributed float value between min (inclusive) and max (exclusive) from this random number generator's sequence.

    Definition Classes
    Random
  9. def between(minInclusive: Double, maxExclusive: Double): Double

    Returns the next pseudorandom, uniformly distributed double value between min (inclusive) and max (exclusive) from this random number generator's sequence.

    Returns the next pseudorandom, uniformly distributed double value between min (inclusive) and max (exclusive) from this random number generator's sequence.

    Definition Classes
    Random
  10. def clone(): AnyRef

    Create a copy of the receiver object.

    Create a copy of the receiver object.

    The default implementation of the clone method is platform dependent.

    returns

    a copy of the receiver object.

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.CloneNotSupportedException]) @native()
    Note

    not specified by SLS as a member of AnyRef

  11. final def eq(arg0: AnyRef): Boolean

    Tests whether the argument (that) is a reference to the receiver object (this).

    Tests whether the argument (that) is a reference to the receiver object (this).

    The eq method implements an equivalence relation on non-null instances of AnyRef, and has three additional properties:

    • It is consistent: for any non-null instances x and y of type AnyRef, multiple invocations of x.eq(y) consistently returns true or consistently returns false.
    • For any non-null instance x of type AnyRef, x.eq(null) and null.eq(x) returns false.
    • null.eq(null) returns true.

    When overriding the equals or hashCode methods, it is important to ensure that their behavior is consistent with reference equality. Therefore, if two objects are references to each other (o1 eq o2), they should be equal to each other (o1 == o2) and they should hash to the same value (o1.hashCode == o2.hashCode).

    returns

    true if the argument is a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  12. def equals(arg0: AnyRef): Boolean

    The equality method for reference types.

    The equality method for reference types. Default implementation delegates to eq.

    See also equals in scala.Any.

    returns

    true if the receiver object is equivalent to the argument; false otherwise.

    Definition Classes
    AnyRef → Any
  13. def finalize(): Unit

    Called by the garbage collector on the receiver object when there are no more references to the object.

    Called by the garbage collector on the receiver object when there are no more references to the object.

    The details of when and if the finalize method is invoked, as well as the interaction between finalize and non-local returns and exceptions, are all platform dependent.

    Attributes
    protected[lang]
    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.Throwable])
    Note

    not specified by SLS as a member of AnyRef

  14. final def getClass(): Class[_ <: AnyRef]

    Returns the runtime class representation of the object.

    Returns the runtime class representation of the object.

    returns

    a class object corresponding to the runtime type of the receiver.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  15. def hashCode(): Int

    The hashCode method for reference types.

    The hashCode method for reference types. See hashCode in scala.Any.

    returns

    the hash code value for this object.

    Definition Classes
    AnyRef → Any
    Annotations
    @native()
  16. final def isInstanceOf[T0]: Boolean

    Test whether the dynamic type of the receiver object has the same erasure as T0.

    Test whether the dynamic type of the receiver object has the same erasure as T0.

    Depending on what T0 is, the test is done in one of the below ways:

    • T0 is a non-parameterized class type, e.g. BigDecimal: this method returns true if the value of the receiver object is a BigDecimal or a subtype of BigDecimal.
    • T0 is a parameterized class type, e.g. List[Int]: this method returns true if the value of the receiver object is some List[X] for any X. For example, List(1, 2, 3).isInstanceOf[List[String]] will return true.
    • T0 is some singleton type x.type or literal x: this method returns this.eq(x). For example, x.isInstanceOf[1] is equivalent to x.eq(1)
    • T0 is an intersection X with Y or X & Y: this method is equivalent to x.isInstanceOf[X] && x.isInstanceOf[Y]
    • T0 is a union X | Y: this method is equivalent to x.isInstanceOf[X] || x.isInstanceOf[Y]
    • T0 is a type parameter or an abstract type member: this method is equivalent to isInstanceOf[U] where U is T0's upper bound, Any if T0 is unbounded. For example, x.isInstanceOf[A] where A is an unbounded type parameter will return true for any value of x.

    This is exactly equivalent to the type pattern _: T0

    returns

    true if the receiver object is an instance of erasure of type T0; false otherwise.

    Definition Classes
    Any
    Note

    due to the unexpectedness of List(1, 2, 3).isInstanceOf[List[String]] returning true and x.isInstanceOf[A] where A is a type parameter or abstract member returning true, these forms issue a warning.

  17. implicit def javaRandomToRandom(r: java.util.Random): Random
  18. final def ne(arg0: AnyRef): Boolean

    Equivalent to !(this eq that).

    Equivalent to !(this eq that).

    returns

    true if the argument is not a reference to the receiver object; false otherwise.

    Definition Classes
    AnyRef
  19. 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
  20. def nextBytes(n: Int): Array[Byte]

    Generates n random bytes and returns them in a new array.

    Generates n random bytes and returns them in a new array.

    Definition Classes
    Random
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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
  26. 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
  27. def nextLong(n: Long): Long

    Returns a pseudorandom, uniformly distributed long value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

    Returns a pseudorandom, uniformly distributed long value between 0 (inclusive) and the specified value (exclusive), drawn from this random number generator's sequence.

    Definition Classes
    Random
  28. 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
  29. 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
  30. 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
  31. final def notify(): Unit

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Wakes up a single thread that is waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  32. final def notifyAll(): Unit

    Wakes up all threads that are waiting on the receiver object's monitor.

    Wakes up all threads that are waiting on the receiver object's monitor.

    Definition Classes
    AnyRef
    Annotations
    @native()
    Note

    not specified by SLS as a member of AnyRef

  33. val self: java.util.Random
    Definition Classes
    Random
  34. def setSeed(seed: Long): Unit
    Definition Classes
    Random
  35. def shuffle[T, C](xs: IterableOnce[T])(implicit bf: BuildFrom[xs.type, T, C]): C

    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
  36. final def synchronized[T0](arg0: => T0): T0

    Executes the code in body with an exclusive lock on this.

    Executes the code in body with an exclusive lock on this.

    returns

    the result of body

    Definition Classes
    AnyRef
  37. def toString(): String

    Creates a String representation of this object.

    Creates a String representation of this object. The default representation is platform dependent. On the java platform it is the concatenation of the class name, "@", and the object's hashcode in hexadecimal.

    returns

    a String representation of the object.

    Definition Classes
    AnyRef → Any
  38. final def wait(): Unit

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait--.

    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
    Note

    not specified by SLS as a member of AnyRef

  39. final def wait(arg0: Long, arg1: Int): Unit

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-int-

    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException])
    Note

    not specified by SLS as a member of AnyRef

  40. final def wait(arg0: Long): Unit

    See https://docs.oracle.com/javase/8/docs/api/java/lang/Object.html#wait-long-.

    Definition Classes
    AnyRef
    Annotations
    @throws(classOf[java.lang.InterruptedException]) @native()
    Note

    not specified by SLS as a member of AnyRef

Inherited from Random

Inherited from java.io.Serializable

Inherited from AnyRef

Inherited from Any

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