object JavaConverters extends DecorateAsJava with DecorateAsScala
A variety of decorators that enable converting between
Scala and Java collections using extension methods, asScala
and asJava
.
The extension methods return adapters for the corresponding API.
The following conversions are supported via asScala
and asJava
:
scala.collection.Iterable <=> java.lang.Iterable scala.collection.Iterator <=> java.util.Iterator scala.collection.mutable.Buffer <=> java.util.List scala.collection.mutable.Set <=> java.util.Set scala.collection.mutable.Map <=> java.util.Map scala.collection.concurrent.Map <=> java.util.concurrent.ConcurrentMap
The following conversions are supported via asScala
and through
specially-named extension methods to convert to Java collections, as shown:
scala.collection.Iterable <=> java.util.Collection (via asJavaCollection) scala.collection.Iterator <=> java.util.Enumeration (via asJavaEnumeration) scala.collection.mutable.Map <=> java.util.Dictionary (via asJavaDictionary)
In addition, the following one-way conversions are provided via asJava
:
scala.collection.Seq => java.util.List scala.collection.mutable.Seq => java.util.List scala.collection.Set => java.util.Set scala.collection.Map => java.util.Map
The following one way conversion is provided via asScala
:
java.util.Properties => scala.collection.mutable.Map
In all cases, converting from a source type to a target type and back again will return the original source object. For example:
import scala.collection.JavaConverters._ val source = new scala.collection.mutable.ListBuffer[Int] val target: java.util.List[Int] = source.asJava val other: scala.collection.mutable.Buffer[Int] = target.asScala assert(source eq other)
Alternatively, the conversion methods have descriptive names and can be invoked explicitly.
scala> val vs = java.util.Arrays.asList("hi", "bye") vs: java.util.List[String] = [hi, bye] scala> val ss = asScalaIterator(vs.iterator) ss: Iterator[String] = non-empty iterator scala> .toList res0: List[String] = List(hi, bye) scala> val ss = asScalaBuffer(vs) ss: scala.collection.mutable.Buffer[String] = Buffer(hi, bye)
- Source
- JavaConverters.scala
- Since
2.8.1
- Alphabetic
- By Inheritance
- JavaConverters
- DecorateAsScala
- AsScalaConverters
- DecorateAsJava
- AsJavaConverters
- AnyRef
- Any
- Hide All
- Show All
- Public
- All
Value Members
-
def
asJavaCollection[A](i: Iterable[A]): Collection[A]
Converts a Scala
Iterable
to an immutable JavaCollection
.Converts a Scala
Iterable
to an immutable JavaCollection
.If the Scala
Iterable
was previously obtained from an implicit or explicit call ofJavaConverters.collectionAsScalaIterable(java.util.Collection)
then the original JavaCollection
will be returned.- i
The Scala
Iterable
to be converted.- returns
A Java
Collection
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
asJavaCollectionConverter[A](i: Iterable[A]): AsJavaCollection[A]
Adds an
asJavaCollection
method that implicitly converts a ScalaIterable
to an immutable JavaCollection
.Adds an
asJavaCollection
method that implicitly converts a ScalaIterable
to an immutable JavaCollection
.- Definition Classes
- DecorateAsJava
- See also
-
def
asJavaDictionary[A, B](m: mutable.Map[A, B]): Dictionary[A, B]
Converts a Scala mutable
Map
to a JavaDictionary
.Converts a Scala mutable
Map
to a JavaDictionary
.The returned Java
Dictionary
is backed by the provided ScalaDictionary
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
Dictionary
was previously obtained from an implicit or explicit call ofJavaConverters.dictionaryAsScalaMap(java.util.Dictionary)
then the original JavaDictionary
will be returned.- m
The Scala
Map
to be converted.- returns
A Java
Dictionary
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
asJavaDictionaryConverter[A, B](m: mutable.Map[A, B]): AsJavaDictionary[A, B]
Adds an
asJavaDictionary
method that implicitly converts a Scala mutableMap
to a JavaDictionary
.Adds an
asJavaDictionary
method that implicitly converts a Scala mutableMap
to a JavaDictionary
.- Definition Classes
- DecorateAsJava
- See also
-
def
asJavaEnumeration[A](i: Iterator[A]): java.util.Enumeration[A]
Converts a Scala
Iterator
to a JavaEnumeration
.Converts a Scala
Iterator
to a JavaEnumeration
.The returned Java
Enumeration
is backed by the provided ScalaIterator
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
Iterator
was previously obtained from an implicit or explicit call ofJavaConverters.enumerationAsScalaIterator(java.util.Enumeration)
then the original JavaEnumeration
will be returned.- i
The Scala
Iterator
to be converted.- returns
A Java
Enumeration
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
asJavaEnumerationConverter[A](i: Iterator[A]): AsJavaEnumeration[A]
Adds an
asJavaEnumeration
method that implicitly converts a ScalaIterator
to a JavaEnumeration
.Adds an
asJavaEnumeration
method that implicitly converts a ScalaIterator
to a JavaEnumeration
.- Definition Classes
- DecorateAsJava
- See also
-
def
asJavaIterable[A](i: Iterable[A]): java.lang.Iterable[A]
Converts a Scala
Iterable
to a JavaIterable
.Converts a Scala
Iterable
to a JavaIterable
.The returned Java
Iterable
is backed by the provided ScalaIterable
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
Iterable
was previously obtained from an implicit or explicit call ofJavaConverters.iterableAsScalaIterable(java.lang.Iterable)
then the original JavaIterable
will be returned.- i
The Scala
Iterable
to be converted.- returns
A Java
Iterable
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
asJavaIterableConverter[A](i: Iterable[A]): AsJava[java.lang.Iterable[A]]
Adds an
asJava
method that implicitly converts a ScalaIterable
to a JavaIterable
.Adds an
asJava
method that implicitly converts a ScalaIterable
to a JavaIterable
.- Definition Classes
- DecorateAsJava
- See also
-
def
asJavaIterator[A](i: Iterator[A]): java.util.Iterator[A]
Converts a Scala
Iterator
to a JavaIterator
.Converts a Scala
Iterator
to a JavaIterator
.The returned Java
Iterator
is backed by the provided ScalaIterator
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
Iterator
was previously obtained from an implicit or explicit call ofJavaConverters.asScalaIterator(java.util.Iterator)
then the original JavaIterator
will be returned.- i
The Scala
Iterator
to be converted.- returns
A Java
Iterator
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
asJavaIteratorConverter[A](i: Iterator[A]): AsJava[java.util.Iterator[A]]
Adds an
asJava
method that implicitly converts a ScalaIterator
to a JavaIterator
.Adds an
asJava
method that implicitly converts a ScalaIterator
to a JavaIterator
.- Definition Classes
- DecorateAsJava
- See also
-
def
asScalaBuffer[A](l: java.util.List[A]): Buffer[A]
Converts a Java
List
to a Scala mutableBuffer
.Converts a Java
List
to a Scala mutableBuffer
.The returned Scala
Buffer
is backed by the provided JavaList
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.If the Java
List
was previously obtained from an implicit or explicit call ofJavaConverters.bufferAsJavaList(scala.collection.mutable.Buffer)
then the original ScalaBuffer
will be returned.- l
The Java
List
to be converted.- returns
A Scala mutable
Buffer
view of the argument.
- Definition Classes
- AsScalaConverters
-
implicit
def
asScalaBufferConverter[A](l: java.util.List[A]): AsScala[Buffer[A]]
Adds an
asScala
method that implicitly converts a JavaList
to a Scala mutableBuffer
.Adds an
asScala
method that implicitly converts a JavaList
to a Scala mutableBuffer
.- Definition Classes
- DecorateAsScala
- See also
-
def
asScalaIterator[A](i: java.util.Iterator[A]): Iterator[A]
Converts a Java
Iterator
to a ScalaIterator
.Converts a Java
Iterator
to a ScalaIterator
.The returned Scala
Iterator
is backed by the provided JavaIterator
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.If the Java
Iterator
was previously obtained from an implicit or explicit call ofJavaConverters.asJavaIterator(scala.collection.Iterator)
then the original ScalaIterator
will be returned.- i
The Java
Iterator
to be converted.- returns
A Scala
Iterator
view of the argument.
- Definition Classes
- AsScalaConverters
-
implicit
def
asScalaIteratorConverter[A](i: java.util.Iterator[A]): AsScala[Iterator[A]]
Adds an
asScala
method that implicitly converts a JavaIterator
to a ScalaIterator
.Adds an
asScala
method that implicitly converts a JavaIterator
to a ScalaIterator
.- Definition Classes
- DecorateAsScala
- See also
-
def
asScalaSet[A](s: java.util.Set[A]): mutable.Set[A]
Converts a Java
Set
to a Scala mutableSet
.Converts a Java
Set
to a Scala mutableSet
.The returned Scala
Set
is backed by the provided JavaSet
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.If the Java
Set
was previously obtained from an implicit or explicit call ofJavaConverters.mutableSetAsJavaSet(scala.collection.mutable.Set)
then the original ScalaSet
will be returned.- s
The Java
Set
to be converted.- returns
A Scala mutable
Set
view of the argument.
- Definition Classes
- AsScalaConverters
-
implicit
def
asScalaSetConverter[A](s: java.util.Set[A]): AsScala[mutable.Set[A]]
Adds an
asScala
method that implicitly converts a JavaSet
to a Scala mutableSet
.Adds an
asScala
method that implicitly converts a JavaSet
to a Scala mutableSet
.- Definition Classes
- DecorateAsScala
- See also
-
def
bufferAsJavaList[A](b: Buffer[A]): java.util.List[A]
Converts a Scala mutable
Buffer
to a Java List.Converts a Scala mutable
Buffer
to a Java List.The returned Java List is backed by the provided Scala
Buffer
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
Buffer
was previously obtained from an implicit or explicit call ofJavaConverters.asScalaBuffer(java.util.List)
then the original JavaList
will be returned.- b
The Scala
Buffer
to be converted.- returns
A Java
List
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
bufferAsJavaListConverter[A](b: Buffer[A]): AsJava[java.util.List[A]]
Adds an
asJava
method that implicitly converts a Scala mutableBuffer
to a JavaList
.Adds an
asJava
method that implicitly converts a Scala mutableBuffer
to a JavaList
.- Definition Classes
- DecorateAsJava
- See also
-
def
collectionAsScalaIterable[A](i: Collection[A]): Iterable[A]
Converts a Java
Collection
to an ScalaIterable
.Converts a Java
Collection
to an ScalaIterable
.If the Java
Collection
was previously obtained from an implicit or explicit call ofJavaConverters.asJavaCollection(scala.collection.Iterable)
then the original ScalaIterable
will be returned.- i
The Java
Collection
to be converted.- returns
A Scala
Iterable
view of the argument.
- Definition Classes
- AsScalaConverters
-
implicit
def
collectionAsScalaIterableConverter[A](i: Collection[A]): AsScala[Iterable[A]]
Adds an
asScala
method that implicitly converts a JavaCollection
to an ScalaIterable
.Adds an
asScala
method that implicitly converts a JavaCollection
to an ScalaIterable
.- Definition Classes
- DecorateAsScala
- See also
-
def
dictionaryAsScalaMap[A, B](p: Dictionary[A, B]): mutable.Map[A, B]
Converts a Java
Dictionary
to a Scala mutableMap
.Converts a Java
Dictionary
to a Scala mutableMap
.The returned Scala
Map
is backed by the provided JavaDictionary
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.If the Java
Dictionary
was previously obtained from an implicit or explicit call ofJavaConverters.asJavaDictionary(scala.collection.mutable.Map)
then the original ScalaMap
will be returned.- p
The Java
Dictionary
to be converted.- returns
A Scala mutable
Map
view of the argument.
- Definition Classes
- AsScalaConverters
-
implicit
def
dictionaryAsScalaMapConverter[A, B](p: Dictionary[A, B]): AsScala[mutable.Map[A, B]]
Adds an
asScala
method that implicitly converts a JavaDictionary
to a Scala mutableMap
.Adds an
asScala
method that implicitly converts a JavaDictionary
to a Scala mutableMap
.- Definition Classes
- DecorateAsScala
- See also
-
def
enumerationAsScalaIterator[A](i: java.util.Enumeration[A]): Iterator[A]
Converts a Java
Enumeration
to a ScalaIterator
.Converts a Java
Enumeration
to a ScalaIterator
.The returned Scala
Iterator
is backed by the provided JavaEnumeration
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.If the Java
Enumeration
was previously obtained from an implicit or explicit call ofJavaConverters.asJavaEnumeration(scala.collection.Iterator)
then the original ScalaIterator
will be returned.- i
The Java
Enumeration
to be converted.- returns
A Scala
Iterator
view of the argument.
- Definition Classes
- AsScalaConverters
-
implicit
def
enumerationAsScalaIteratorConverter[A](i: java.util.Enumeration[A]): AsScala[Iterator[A]]
Adds an
asScala
method that implicitly converts a JavaEnumeration
to a ScalaIterator
.Adds an
asScala
method that implicitly converts a JavaEnumeration
to a ScalaIterator
.- Definition Classes
- DecorateAsScala
- See also
-
def
iterableAsScalaIterable[A](i: java.lang.Iterable[A]): Iterable[A]
Converts a Java
Iterable
to a ScalaIterable
.Converts a Java
Iterable
to a ScalaIterable
.The returned Scala
Iterable
is backed by the provided JavaIterable
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.If the Java
Iterable
was previously obtained from an implicit or explicit call ofJavaConverters.asJavaIterable(scala.collection.Iterable) then the original Scala
Iterable
will be returned.- i
The Java
Iterable
to be converted.- returns
A Scala
Iterable
view of the argument.
- Definition Classes
- AsScalaConverters
-
implicit
def
iterableAsScalaIterableConverter[A](i: java.lang.Iterable[A]): AsScala[Iterable[A]]
Adds an
asScala
method that implicitly converts a JavaIterable
to a ScalaIterable
.Adds an
asScala
method that implicitly converts a JavaIterable
to a ScalaIterable
.- Definition Classes
- DecorateAsScala
- See also
-
def
mapAsJavaConcurrentMap[A, B](m: concurrent.Map[A, B]): ConcurrentMap[A, B]
Converts a Scala mutable
concurrent.Map
to a JavaConcurrentMap
.Converts a Scala mutable
concurrent.Map
to a JavaConcurrentMap
.The returned Java
ConcurrentMap
is backed by the provided Scalaconcurrent.Map
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
concurrent.Map
was previously obtained from an implicit or explicit call ofJavaConverters.mapAsScalaConcurrentMap(java.util.concurrent.ConcurrentMap)
then the original JavaConcurrentMap
will be returned.- m
The Scala
concurrent.Map
to be converted.- returns
A Java
ConcurrentMap
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
mapAsJavaConcurrentMapConverter[A, B](m: concurrent.Map[A, B]): AsJava[ConcurrentMap[A, B]]
Adds an
asJava
method that implicitly converts a Scala mutableconcurrent.Map
to a JavaConcurrentMap
.Adds an
asJava
method that implicitly converts a Scala mutableconcurrent.Map
to a JavaConcurrentMap
.- Definition Classes
- DecorateAsJava
- See also
-
def
mapAsJavaMap[A, B](m: Map[A, B]): java.util.Map[A, B]
Converts a Scala
Map
to a JavaMap
.Converts a Scala
Map
to a JavaMap
.The returned Java
Map
is backed by the provided ScalaMap
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
Map
was previously obtained from an implicit or explicit call ofJavaConverters.mapAsScalaMap(java.util.Map)
then the original JavaMap
will be returned.- m
The Scala
Map
to be converted.- returns
A Java
Map
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
mapAsJavaMapConverter[A, B](m: Map[A, B]): AsJava[java.util.Map[A, B]]
Adds an
asJava
method that implicitly converts a ScalaMap
to a JavaMap
.Adds an
asJava
method that implicitly converts a ScalaMap
to a JavaMap
.- Definition Classes
- DecorateAsJava
- See also
-
def
mapAsScalaConcurrentMap[A, B](m: ConcurrentMap[A, B]): concurrent.Map[A, B]
Converts a Java
ConcurrentMap
to a Scala mutableConcurrentMap
.Converts a Java
ConcurrentMap
to a Scala mutableConcurrentMap
.The returned Scala
ConcurrentMap
is backed by the provided JavaConcurrentMap
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.If the Java
ConcurrentMap
was previously obtained from an implicit or explicit call ofJavaConverters.mapAsJavaConcurrentMap(scala.collection.mutable.ConcurrentMap)
then the original ScalaConcurrentMap
will be returned.- m
The Java
ConcurrentMap
to be converted.- returns
A Scala mutable
ConcurrentMap
view of the argument.
- Definition Classes
- AsScalaConverters
-
implicit
def
mapAsScalaConcurrentMapConverter[A, B](m: ConcurrentMap[A, B]): AsScala[concurrent.Map[A, B]]
Adds an
asScala
method that implicitly converts a JavaConcurrentMap
to a Scala mutableconcurrent.Map
.Adds an
asScala
method that implicitly converts a JavaConcurrentMap
to a Scala mutableconcurrent.Map
.- Definition Classes
- DecorateAsScala
- See also
-
def
mapAsScalaMap[A, B](m: java.util.Map[A, B]): mutable.Map[A, B]
Converts a Java
Map
to a Scala mutableMap
.Converts a Java
Map
to a Scala mutableMap
.The returned Scala
Map
is backed by the provided JavaMap
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.If the Java
Map
was previously obtained from an implicit or explicit call ofJavaConverters.mutableMapAsJavaMap(scala.collection.mutable.Map)
then the original ScalaMap
will be returned.If the wrapped map is synchronized (e.g. from
java.util.Collections.synchronizedMap
), it is your responsibility to wrap all non-atomic operations withunderlying.synchronized
. This includesget
, asjava.util.Map
's API does not allow for an atomicget
whennull
values may be present.- m
The Java
Map
to be converted.- returns
A Scala mutable
Map
view of the argument.
- Definition Classes
- AsScalaConverters
-
implicit
def
mapAsScalaMapConverter[A, B](m: java.util.Map[A, B]): AsScala[mutable.Map[A, B]]
Adds an
asScala
method that implicitly converts a JavaMap
to a Scala mutableMap
.Adds an
asScala
method that implicitly converts a JavaMap
to a Scala mutableMap
.- Definition Classes
- DecorateAsScala
- See also
-
def
mutableMapAsJavaMap[A, B](m: mutable.Map[A, B]): java.util.Map[A, B]
Converts a Scala mutable
Map
to a JavaMap
.Converts a Scala mutable
Map
to a JavaMap
.The returned Java
Map
is backed by the provided ScalaMap
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
Map
was previously obtained from an implicit or explicit call ofJavaConverters.mapAsScalaMap(java.util.Map)
then the original JavaMap
will be returned.- m
The Scala mutable
Map
to be converted.- returns
A Java
Map
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
mutableMapAsJavaMapConverter[A, B](m: mutable.Map[A, B]): AsJava[java.util.Map[A, B]]
Adds an
asJava
method that implicitly converts a Scala mutableMap
to a JavaMap
.Adds an
asJava
method that implicitly converts a Scala mutableMap
to a JavaMap
.- Definition Classes
- DecorateAsJava
- See also
-
def
mutableSeqAsJavaList[A](s: mutable.Seq[A]): java.util.List[A]
Converts a Scala mutable
Seq
to a JavaList
.Converts a Scala mutable
Seq
to a JavaList
.The returned Java
List
is backed by the provided ScalaSeq
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
Seq
was previously obtained from an implicit or explicit call ofJavaConverters.asScalaBuffer(java.util.List)
then the original JavaList
will be returned.- s
The Scala
Seq
to be converted.- returns
A Java
List
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
mutableSeqAsJavaListConverter[A](b: mutable.Seq[A]): AsJava[java.util.List[A]]
Adds an
asJava
method that implicitly converts a Scala mutableSeq
to a JavaList
.Adds an
asJava
method that implicitly converts a Scala mutableSeq
to a JavaList
.- Definition Classes
- DecorateAsJava
- See also
-
def
mutableSetAsJavaSet[A](s: mutable.Set[A]): java.util.Set[A]
Converts a Scala mutable
Set
to a JavaSet
.Converts a Scala mutable
Set
to a JavaSet
.The returned Java
Set
is backed by the provided ScalaSet
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
Set
was previously obtained from an implicit or explicit call ofJavaConverters.asScalaSet(java.util.Set)
then the original JavaSet
will be returned.- s
The Scala mutable
Set
to be converted.- returns
A Java
Set
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
mutableSetAsJavaSetConverter[A](s: mutable.Set[A]): AsJava[java.util.Set[A]]
Adds an
asJava
method that implicitly converts a Scala mutableSet
to a JavaSet
.Adds an
asJava
method that implicitly converts a Scala mutableSet
to a JavaSet
.- Definition Classes
- DecorateAsJava
- See also
-
def
propertiesAsScalaMap(p: Properties): mutable.Map[String, String]
Converts a Java
Properties
to a Scala mutableMap[String, String]
.Converts a Java
Properties
to a Scala mutableMap[String, String]
.The returned Scala
Map[String, String]
is backed by the provided JavaProperties
and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.- p
The Java
Properties
to be converted.- returns
A Scala mutable
Map[String, String]
view of the argument.
- Definition Classes
- AsScalaConverters
-
implicit
def
propertiesAsScalaMapConverter(p: Properties): AsScala[mutable.Map[String, String]]
Adds an
asScala
method that implicitly converts a JavaProperties
to a Scala mutableMap[String, String]
.Adds an
asScala
method that implicitly converts a JavaProperties
to a Scala mutableMap[String, String]
.- Definition Classes
- DecorateAsScala
- See also
-
def
seqAsJavaList[A](s: Seq[A]): java.util.List[A]
Converts a Scala
Seq
to a JavaList
.Converts a Scala
Seq
to a JavaList
.The returned Java
List
is backed by the provided ScalaSeq
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
Seq
was previously obtained from an implicit or explicit call ofJavaConverters.asScalaBuffer(java.util.List)
then the original JavaList
will be returned.- s
The Scala
Seq
to be converted.- returns
A Java
List
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
seqAsJavaListConverter[A](b: Seq[A]): AsJava[java.util.List[A]]
Adds an
asJava
method that implicitly converts a ScalaSeq
to a JavaList
.Adds an
asJava
method that implicitly converts a ScalaSeq
to a JavaList
.- Definition Classes
- DecorateAsJava
- See also
-
def
setAsJavaSet[A](s: Set[A]): java.util.Set[A]
Converts a Scala
Set
to a JavaSet
.Converts a Scala
Set
to a JavaSet
.The returned Java
Set
is backed by the provided ScalaSet
and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.If the Scala
Set
was previously obtained from an implicit or explicit call ofJavaConverters.asScalaSet(java.util.Set)
then the original JavaSet
will be returned.- s
The Scala
Set
to be converted.- returns
A Java
Set
view of the argument.
- Definition Classes
- AsJavaConverters
-
implicit
def
setAsJavaSetConverter[A](s: Set[A]): AsJava[java.util.Set[A]]
Adds an
asJava
method that implicitly converts a ScalaSet
to a JavaSet
.Adds an
asJava
method that implicitly converts a ScalaSet
to a JavaSet
.- Definition Classes
- DecorateAsJava
- See also
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
.