EDIT: Java Conversions got @deprecated in Scala 2.13.0. Use scala.jdk.CollectionConverters instead.

JavaConversions provide a series of implicit methods that convert between a Java collection and the closest corresponding Scala collection, and vice versa. This is done by creating wrappers that implement either the Scala interface and forward the calls to the underlying Java collection, or the Java interface, forwarding the calls to the underlying Scala collection.

JavaConverters uses the pimp-my-library pattern to “add” the asScala method to the Java collections and the asJava method to the Scala collections, which return the appropriate wrappers discussed above. It is newer (since version 2.8.1) than JavaConversions (since 2.8) and makes the conversion between Scala and Java collection explicit. Contrary to what David writes in his answer, I'd recommend you make it a habit to use JavaConverters as you'll be much less likely to write code that makes a lot of implicit conversions, as you can control the only spot where that will happen: where you write .asScala or .asJava .

Here's the conversion methods that JavaConverters provide:

Pimped Type | Conversion Method | Returned Type ================================================================================================= scala.collection.Iterator | asJava | java.util.Iterator scala.collection.Iterator | asJavaEnumeration | java.util.Enumeration scala.collection.Iterable | asJava | java.lang.Iterable scala.collection.Iterable | asJavaCollection | java.util.Collection scala.collection.mutable.Buffer | asJava | java.util.List scala.collection.mutable.Seq | asJava | java.util.List scala.collection.Seq | asJava | java.util.List scala.collection.mutable.Set | asJava | java.util.Set scala.collection.Set | asJava | java.util.Set scala.collection.mutable.Map | asJava | java.util.Map scala.collection.Map | asJava | java.util.Map scala.collection.mutable.Map | asJavaDictionary | java.util.Dictionary scala.collection.mutable.ConcurrentMap | asJavaConcurrentMap | java.util.concurrent.ConcurrentMap ————————————————————————————————————————————————————————————————————————————————————————————————— java.util.Iterator | asScala | scala.collection.Iterator java.util.Enumeration | asScala | scala.collection.Iterator java.lang.Iterable | asScala | scala.collection.Iterable java.util.Collection | asScala | scala.collection.Iterable java.util.List | asScala | scala.collection.mutable.Buffer java.util.Set | asScala | scala.collection.mutable.Set java.util.Map | asScala | scala.collection.mutable.Map java.util.concurrent.ConcurrentMap | asScala | scala.collection.mutable.ConcurrentMap java.util.Dictionary | asScala | scala.collection.mutable.Map java.util.Properties | asScala | scala.collection.mutable.Map[String, String]

To use the conversions directly from Java, though, you're better off calling methods from JavaConversions directly; e.g.: