Object scala.util.Sorting
object Sorting
Value Members
final def !=(arg0: Any): Boolean
Test two objects for inequality.
- returns
true
if !(this == that), false otherwise.
- Definition Classes
- AnyRef → Any
final def ##(): Int
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
final def ==(arg0: Any): Boolean
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
final def asInstanceOf[T0]: T0
Cast the receiver object to be of type T0
.
Note that the success of a cast at runtime is modulo Scala's erasure semantics. Therefore the expression 1.asInstanceOf[String]
will throw a ClassCastException
at runtime, while the expression List(1).asInstanceOf[List[String]]
will not. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the requested type.
- returns
the receiver object.
- Definition Classes
- Any
- Exceptions thrown
ClassCastException
if the receiver object is not an instance of the erasure of typeT0
.
def clone(): AnyRef
Create a copy of the receiver object.
The default implementation of the clone
method is platform dependent.
- returns
a copy of the receiver object.
final def eq(arg0: AnyRef): Boolean
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
def equals(arg0: Any): Boolean
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
def finalize(): Unit
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
final def getClass(): Class[_]
Returns the runtime class representation of the object.
- returns
a class object corresponding to the runtime type of the receiver.
def hashCode(): Int
The hashCode method for reference types. See hashCode in scala.Any.
- returns
the hash code value for this object.
final def isInstanceOf[T0]: Boolean
Test whether the dynamic type of the receiver object is T0
.
Note that the result of the test is modulo Scala's erasure semantics. Therefore the expression 1.isInstanceOf[String]
will return false
, while the expression List(1).isInstanceOf[List[String]]
will return true
. In the latter example, because the type argument is erased as part of compilation it is not possible to check whether the contents of the list are of the specified type.
- returns
true
if the receiver object is an instance of erasure of typeT0
;false
otherwise.
- Definition Classes
- Any
final def ne(arg0: AnyRef): Boolean
Equivalent to !(this eq that)
.
- returns
true
if the argument is not a reference to the receiver object;false
otherwise.
- Definition Classes
- AnyRef
final def notify(): Unit
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
final def notifyAll(): Unit
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
def quickSort[K](a: Array[K])(implicit arg0: math.Ordering[K]): Unit
Sort array a
with quicksort, using the Ordering on its elements. This algorithm sorts in place, so no additional memory is used aside from what might be required to box individual elements during comparison.
def quickSort(a: Array[Float]): Unit
def quickSort(a: Array[Int]): Unit
def quickSort(a: Array[Double]): Unit
def stableSort[K, M](a: Seq[K], f: (K) ⇒ M)(implicit arg0: ClassTag[K], arg1: math.Ordering[M]): Array[K]
A sorted Array, given an extraction function f
that returns an ordered key for each item in the sequence a
. Uses java.util.Arrays.sort
unless K
is a primitive type.
def stableSort[K](a: Seq[K], f: (K, K) ⇒ Boolean)(implicit arg0: ClassTag[K]): Array[K]
A sorted Array, given a function f
that computes the less-than relation for each item in the sequence a
. Uses java.util.Arrays.sort
unless K
is a primitive type.
def stableSort[K](a: Seq[K])(implicit arg0: ClassTag[K], arg1: math.Ordering[K]): Array[K]
A sorted Array, using the Ordering for the elements in the sequence a
. Uses java.util.Arrays.sort
unless K
is a primitive type.
def stableSort[K](a: Array[K], f: (K, K) ⇒ Boolean)(implicit arg0: ClassTag[K]): Unit
Sort array a
using function f
that computes the less-than relation for each element. Uses java.util.Arrays.sort
unless K
is a primitive type.
def stableSort[K](a: Array[K])(implicit arg0: ClassTag[K], arg1: math.Ordering[K]): Unit
Sort array a
using the Ordering on its elements, preserving the original ordering where possible. Uses java.util.Arrays.sort
unless K
is a primitive type.
final def synchronized[T0](arg0: ⇒ T0): T0
- Definition Classes
- AnyRef
def toString(): String
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
final def wait(): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
final def wait(arg0: Long, arg1: Int): Unit
- Definition Classes
- AnyRef
- Annotations
- @throws( ... )
final def wait(arg0: Long): Unit
© 2002-2019 EPFL, with contributions from Lightbend.
Licensed under the Apache License, Version 2.0.
https://www.scala-lang.org/api/2.12.9/scala/util/Sorting$.html
The
Sorting
object provides convenience wrappers forjava.util.Arrays.sort
. Methods that defer tojava.util.Arrays.sort
say that they do or under what conditions that they do.Sorting
also implements a general-purpose quicksort and stable (merge) sort for those cases wherejava.util.Arrays.sort
could only be used at the cost of a large memory penalty. If performance rather than memory usage is the primary concern, one may wish to find alternate strategies to usejava.util.Arrays.sort
directly e.g. by boxing primitives to use a custom ordering on them.Sorting
provides methods where you can provide a comparison function, or can request a sort of items that are scala.math.Ordered or that otherwise have an implicit or explicit scala.math.Ordering.Note also that high-performance non-default sorts for numeric types are not provided. If this is required, it is advisable to investigate other libraries that cover this use case.