A library for converting between Java and Scala collections.
Turn any Scala collection into the corresponding Java collection:
import scalaj.collection.Imports._
List(1, 2, 3).asJava
// returns java.util.List[java.lang.Integer]
Map(1 -> "a", 2 -> "b", 3 -> "c").asJava
// returns java.util.Map[java.lang.Integer, java.lang.String]
Set(1, 2, 3).asJava
// returns java.util.Set[java.lang.Integer]
Turn any Java collection into the corresponding Scala collection:
val list = new java.util.ArrayList[java.lang.Integer]
list.add(1)
list.add(2)
list.add(3)
list.asScala
// returns scala.Seq[Int]
As shown in the above examples, the library also converts between the boxed types of Scala and Java primitives.
You can also use foreach on any Java collection:
list.foreach(print)
// prints "123"
The map, filter, and flatMap methods are still pending.
scalaj-collection requires Scala 2.9.x, 2.10.x or 2.11.x
If you're using sbt, simply add the following line to your project file:
libraryDependencies += "org.scalaj" %% "scalaj-collection" % "1.6"
If you're using Maven, add the following to your pom.xml:
<dependency>
<groupId>org.scalaj</groupId>
<artifactId>scalaj-collection_${scala.version}</artifactId>
<version>1.6</version>
</dependency>
Download the jars from sonatype.org
Clone the repository from Github:
git clone git://github.com/scalaj/scalaj-collection.git
Build the project and create the JAR (requires sbt version 0.12.4 or greater):
cd scalaj-collection
sbt package
The following methods are added via the Swag My Library pattern:
// Java to Scala
java.lang.Comparable[A] #asScala: scala.math.Ordered[A]
java.util.Comparator[A] #asScala: scala.math.Ordering[A]
java.util.Enumeration[A] #asScala: scala.collection.Iterator[A]
#foreach(A => Unit): Unit
java.util.Iterator[A] #asScala: scala.collection.Iterator[A]
#foreach(A => Unit): Unit
java.lang.Iterable[A] #asScala: scala.collection.Iterable[A]
#foreach(A => Unit): Unit
java.util.List[A] #asScala: scala.collection.Seq[A]
#asScalaMutable: scala.collection.mutable.Seq[A]
java.util.Set[A] #asScala: scala.collection.Set[A]
#asScalaMutable: scala.collection.mutable.Set[A]
java.util.Map[A, B] #asScala: scala.collection.Map[A, B]
#asScalaMutable: scala.collection.mutable.Map[A, B]
#foreach(((A, B)) => Unit): Unit
java.util.Dictionary[A, B]#asScala: scala.collection.mutable.Map[A, B]
#foreach(((A, B)) => Unit): Unit
// Scala to Java
scala.math.Ordered[A] #asJava: java.util.Comparable[A]
scala.math.Ordering[A] #asJava: java.util.Comparator[A]
scala.collection.Iterator[A] #asJava: java.util.Iterator[A]
#asJavaEnumeration: java.util.Enumeration[A]
scala.collection.Iterable[A] #asJava: java.lang.Iterable[A]
scala.collection.Seq[A] #asJava: java.util.List[A]
scala.collection.mutable.Seq[A] #asJava: java.util.List[A]
scala.collection.mutable.Buffer[A]#asJava: java.util.List[A]
scala.collection.Set[A] #asJava: java.util.Set[A]
scala.collection.mutable.Set[A] #asJava: java.util.Set[A]
scala.collection.Map[A, B] #asJava: java.util.Map[A, B]
scala.collection.mutable.Map[A, B]#asJava: java.util.Map[A, B]
#asJavaDictionary: java.util.Dictionary[A, B]