Scala Library
scala.collection

object JavaConversions
[source: scala/collection/JavaConversions.scala]
object JavaConversions
extends AnyRef

A collection of implicit conversions supporting interoperability between Scala and Java collections.

The following conversions are supported:

In all cases, converting from a source type to a target type and back again will return the original source object, eg. 

    import scala.collection.JavaConversions._
 
    val sl = new scala.collection.mutable.ListBuffer[Int]
    val jl : java.util.List[Int] = sl
    val sl2 : scala.collection.mutable.Buffer[Int] = jl
    assert(sl eq sl2)g

Note that no conversion is provided from scala.collection.immutable.List to java.util.List. Instead it is convertible to an immutable java.util.Collection which provides size and interation capabilities, but not access by index as would be provided by java.util.List.
This is intentional: in combination the implementation of scala.collection.immutable.List and the typical usage patterns of java.util.List would perform extremely poorly.

Author
Miles Sabin
Since
2.8
Method Summary
implicit def asBuffer [A](l : java.util.List[A]) : Buffer[A]
Implicitly converts a Java List to a Scala mutable Buffer. The returned Scala Buffer is backed by the provided Java List and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
implicit def asCollection [A](i : Iterable[A]) : java.util.Collection[A]
Implicitly converts a Scala Iterable to an immutable Java Collection.
implicit def asEnumeration [A](i : Iterator[A]) : java.util.Enumeration[A]
Implicitly converts a Scala Iterator to a Java Enumeration. The returned Java Enumeration is backed by the provided Scala Iterator and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
implicit def asIterable [A](i : java.lang.Iterable[A]) : Iterable[A]
Implicitly converts a Java Iterable to a Scala Iterable. The returned Scala Iterable is backed by the provided Java Iterable and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
implicit def asIterable [A](i : java.util.Collection[A]) : Iterable[A]
Implicitly converts a Java Collection to an Scala Iterable.
implicit def asIterable [A](i : Iterable[A]) : java.lang.Iterable[A]
Implicitly converts a Scala Iterable to a Java Iterable. The returned Java Iterable is backed by the provided Scala Iterable and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
implicit def asIterator [A](i : java.util.Iterator[A]) : Iterator[A]
Implicitly converts a Java Iterator to a Scala Iterator. The returned Scala Iterator is backed by the provided Java Iterator and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
implicit def asIterator [A](i : Iterator[A]) : java.util.Iterator[A]
Implicitly converts a Scala Iterator to a Java Iterator. The returned Java Iterator is backed by the provided Scala Iterator and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
implicit def asIterator [A](i : java.util.Enumeration[A]) : Iterator[A]
Implicitly converts a Java Enumeration to a Scala Iterator. The returned Scala Iterator is backed by the provided Java Enumeration and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
implicit def asList [A](b : Buffer[A]) : java.util.List[A]
Implicitly 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.
implicit def asMap [A, B](m : Map[A, B])(implicit ma : ClassManifest[A]) : java.util.Map[A, B]
Implicitly converts a Scala mutable Map to a Java Map. The returned Java Map is backed by the provided Scala Map and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
implicit def asMap [A, B](m : java.util.Map[A, B]) : Map[A, B]
Implicitly converts a Java Map to a Scala mutable Map. The returned Scala Map is backed by the provided Java Map and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
implicit def asSet [A](s : Set[A])(implicit m : ClassManifest[A]) : java.util.Set[A]
Implicitly converts a Scala mutable Set to a Java Set. The returned Java Set is backed by the provided Scala Set and any side-effects of using it via the Java interface will be visible via the Scala interface and vice versa.
implicit def asSet [A](s : java.util.Set[A]) : Set[A]
Implicitly converts a Java Set to a Scala mutable Set. The returned Scala Set is backed by the provided Java Set and any side-effects of using it via the Scala interface will be visible via the Java interface and vice versa.
Methods inherited from AnyRef
getClass, hashCode, equals, clone, toString, notify, notifyAll, wait, wait, wait, finalize, ==, !=, eq, ne, synchronized
Methods inherited from Any
==, !=, isInstanceOf, asInstanceOf
Class Summary
case class IterableWrapper [A](val underlying : Iterable[A]) extends java.util.AbstractCollection[A] with Product
case class IteratorWrapper [A](val underlying : Iterator[A]) extends java.util.Iterator[A] with java.util.Enumeration[A] with Product
case class JCollectionWrapper [A](val underlying : java.util.Collection[A]) extends Iterable[A] with Product
case class JEnumerationWrapper [A](val underlying : java.util.Enumeration[A]) extends Iterator[A] with Product
case class JIterableWrapper [A](val underlying : java.lang.Iterable[A]) extends Iterable[A] with Product
case class JIteratorWrapper [A](val underlying : java.util.Iterator[A]) extends Iterator[A] with Product
case class JListWrapper [A](val underlying : java.util.List[A]) extends Buffer[A] with Product
case class JMapWrapper [A, B](val underlying : java.util.Map[A, B]) extends Map[A, B] with MapLike[A, B, JMapWrapper[A, B]] with Product
case class JSetWrapper [A](val underlying : java.util.Set[A]) extends Set[A] with SetLike[A, JSetWrapper[A]] with Product
case class MutableBufferWrapper [A](val underlying : Buffer[A]) extends java.util.AbstractList[A] with Product
case class MutableMapWrapper [A, B](val underlying : Map[A, B], m : ClassManifest[A]) extends java.util.AbstractMap[A, B] with Product
case class MutableSetWrapper [A](val underlying : Set[A], m : ClassManifest[A]) extends java.util.AbstractSet[A] with Product
Method Details
implicit def asIterator[A](i : Iterator[A]) : java.util.Iterator[A]
Implicitly converts a Scala Iterator to a Java Iterator. The returned Java Iterator is backed by the provided Scala Iterator 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 of asIterator(java.util.Iterator) then the original Java Iterator will be returned.

Parameters
i - The Iterator to be converted.
Returns
A Java Iterator view of the argument.
implicit def asEnumeration[A](i : Iterator[A]) : java.util.Enumeration[A]
Implicitly converts a Scala Iterator to a Java Enumeration. The returned Java Enumeration is backed by the provided Scala Iterator 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 of asIterator(java.util.Enumeration) then the original Java Enumeration will be returned.

Parameters
i - The Iterator to be converted.
Returns
A Java Enumeration view of the argument.
implicit def asIterable[A](i : Iterable[A]) : java.lang.Iterable[A]
Implicitly converts a Scala Iterable to a Java Iterable. The returned Java Iterable is backed by the provided Scala Iterable 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 of asIterable(java.lang.Iterable) then the original Java Iterable will be returned.

Parameters
i - The Iterable to be converted.
Returns
A Java Iterable view of the argument.
implicit def asCollection[A](i : Iterable[A]) : java.util.Collection[A]
Implicitly converts a Scala Iterable to an immutable Java Collection.

If the Scala Iterable was previously obtained from an implicit or explicit call of asSizedIterable(java.util.Collection) then the original Java Collection will be returned.

Parameters
i - The SizedIterable to be converted.
Returns
A Java Collection view of the argument.
implicit def asList[A](b : Buffer[A]) : java.util.List[A]
Implicitly 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 of asBuffer(java.util.List) then the original Java List will be returned.

Parameters
b - The Buffer to be converted.
Returns
A Java List view of the argument.
implicit def asSet[A](s : Set[A])(implicit m : ClassManifest[A]) : java.util.Set[A]
Implicitly converts a Scala mutable Set to a Java Set. The returned Java Set is backed by the provided Scala Set 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 of asSet(java.util.Set) then the original Java Set will be returned.

Parameters
s - The Set to be converted.
Returns
A Java Set view of the argument.
implicit def asMap[A, B](m : Map[A, B])(implicit ma : ClassManifest[A]) : java.util.Map[A, B]
Implicitly converts a Scala mutable Map to a Java Map. The returned Java Map is backed by the provided Scala 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 Map was previously obtained from an implicit or explicit call of asMap(java.util.Map) then the original Java Map will be returned.

Parameters
m - The Map to be converted.
Returns
A Java Map view of the argument.
implicit def asIterator[A](i : java.util.Iterator[A]) : Iterator[A]
Implicitly converts a Java Iterator to a Scala Iterator. The returned Scala Iterator is backed by the provided Java Iterator 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 of asIterator(scala.collection.Iterator) then the original Scala Iterator will be returned.

Parameters
i - The Iterator to be converted.
Returns
A Scala Iterator view of the argument.
implicit def asIterator[A](i : java.util.Enumeration[A]) : Iterator[A]
Implicitly converts a Java Enumeration to a Scala Iterator. The returned Scala Iterator is backed by the provided Java Enumeration 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 of asEnumeration(scala.collection.Iterator) then the original Scala Iterator will be returned.

Parameters
i - The Enumeration to be converted.
Returns
A Scala Iterator view of the argument.
implicit def asIterable[A](i : java.lang.Iterable[A]) : Iterable[A]
Implicitly converts a Java Iterable to a Scala Iterable. The returned Scala Iterable is backed by the provided Java Iterable 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 of asIterable(scala.collection.Iterable) then the original Scala Iterable will be returned.

Parameters
i - The Iterable to be converted.
Returns
A Scala Iterable view of the argument.
implicit def asIterable[A](i : java.util.Collection[A]) : Iterable[A]
Implicitly converts a Java Collection to an Scala Iterable.

If the Java Collection was previously obtained from an implicit or explicit call of asCollection(scala.collection.SizedIterable) then the original Scala SizedIterable will be returned.

Parameters
i - The Collection to be converted.
Returns
A Scala SizedIterable view of the argument.
implicit def asBuffer[A](l : java.util.List[A]) : Buffer[A]
Implicitly converts a Java List to a Scala mutable Buffer. The returned Scala Buffer is backed by the provided Java List 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 of asList(scala.collection.mutable.Buffer) then the original Scala Buffer will be returned.

Parameters
l - The List to be converted.
Returns
A Scala mutable Buffer view of the argument.
implicit def asSet[A](s : java.util.Set[A]) : Set[A]
Implicitly converts a Java Set to a Scala mutable Set. The returned Scala Set is backed by the provided Java Set 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 of asSet(scala.collection.mutable.Set) then the original Scala Set will be returned.

Parameters
s - The Set to be converted.
Returns
A Scala mutable Set view of the argument.
implicit def asMap[A, B](m : java.util.Map[A, B]) : Map[A, B]
Implicitly converts a Java Map to a Scala mutable Map. The returned Scala Map is backed by the provided Java Map 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 of asMap(scala.collection.mutable.Map) then the original Scala Map will be returned.

Parameters
m - The Map to be converted.
Returns
A Scala mutable Map view of the argument.
Scala Library