j.u.c.ConcurrentMap asScala

jucAsScala.scala

import java.util.concurrent.ConcurrentHashMap
import java.util.concurrent.ConcurrentMap
import scala.collection.JavaConverters._

val m: ConcurrentMap[String, String] = new ConcurrentHashMap[String, String]
m.put("1", "one")
m.put("2", "two")
val cm: scala.collection.concurrent.Map[String, String] = m.asScala
cm += ("3" -> "three")
cm.foreach(println)

output.txt

~$ scala /tmp/juc.scala
(1,one)
(2,two)
(3,three)