Übung 1

gistfile1.scala

object Phonebook {
  var entries = List[Entry]()
  
  def += (e: Entry) = {
    entries ++= List(e)
    entries = entries.toSet.toList
    this
  }
  
/* 
 //merge this into one def below
  def ++=(l:List[Entry]) = {
	entries ++= l
	entries = entries.toSet.toList
    this
  }
  
  def ++=(s:Set[Entry]) = {
	entries ++= s
	entries = entries.toSet.toList
    this
  }
*/

  def ++=(c:Collection[Entry]) = {
    entries ++= c.toList
    entries = entries.toSet.toList
    this
  }
  
  override def toString(): String = {
    entries.sortWith((e1,e2) => e1.lastname < e2.lastname).mkString(sep = "\n")
  }
}

object Phonebook {
var entries = ListEntry
def +=(e:Entry){ // hier fehlt mir der Rueckgabewert oder?
entries ++= List(e)
this
}
def ++=(l:List[Entry]){
entries ++= l
this
}

override def toString(): String = {
entries.sortWith((e1,e2) => e1.lastName < e2.lastName).mkString(sep = "\n")
}
}