scala集合与java集合类型相互转换：
http://www.scala-lang.org/api/current/index.html#scala.collection.JavaConverters$
您可以通过JavaConverters package轻松地在Java和Scala的集合类型之间转换。它用asScala 装饰常用的Java集合以和用asJava 方法装饰Scala集合。
import scala.collection.JavaConverters._ val sl = new scala.collection.mutable.ListBuffer[Int] val jl : java.util.List[Int] = sl.asJava val sl2 : scala.collection.mutable.Buffer[Int] = jl.asScala assert(sl eq sl2)
双向转换：
scala.collection.Iterable <=> java.lang.Iterable
scala.collection.Iterable <=> java.util.Collection
scala.collection.Iterator <=> java.util.{ Iterator, Enumeration }
scala.collection.mutable.Buffer <=> java.util.List
scala.collection.mutable.Set <=> java.util.Set
scala.collection.mutable.Map <=> java.util.{ Map, Dictionary }
scala.collection.mutable.ConcurrentMap <=> java.util.concurrent.ConcurrentMap此外，也提供了以下单向转换
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
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