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import scala.collection.JavaConversions._
import scala.collection.mutable
object Test extends App {
def testMap(): Unit = {
val mapJ = new java.util.HashMap[Int, String]
val mapS: mutable.Map[Int, String] = mapJ
(10 to 20).foreach(i => mapS += ((i, i.toString)))
assert(11 == mapS.size)
// ConcurrentModificationException thrown in the following line
mapS.retain((i, str) => i % 2 == 0)
assert(6 == mapS.size)
}
def testSet(): Unit = {
val mapJ = new java.util.HashSet[Int]
val mapS: mutable.Set[Int] = mapJ
(10 to 20).foreach(i => mapS += i)
assert(11 == mapS.size)
// ConcurrentModificationException thrown in the following line
mapS.retain((i) => i % 2 == 0)
assert(6 == mapS.size)
}
testSet()
testMap()
}
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