import java.util.{ArrayList, List => JList}


class TestFirst {

  implicit def jList2RichList[T](list: JList[T]) = new {
    def head: T = if (list.size > 0) list.get(0) else null.asInstanceOf[T]
  }

  def doTest {
    val jList = new ArrayList[String]()
    jList.add("a")
    jList.add("b")
    println(jList.head)

    val jList2 = new ArrayList[String]()
    println(jList2.head)
  }
}