// sorting keys of a hashmap

// java
public Enumeration keys() {
     Enumeration keysEnum = super.keys();
     Vector<String> keyList = new Vector<String>();

     while(keysEnum.hasMoreElements()){
       keyList.add((String)keysEnum.nextElement());
     }

     Collections.sort(keyList);
     return keyList.elements();
}

// scala aj s konverziou z a do java.util.Enumeration
def keys(): java.util.Enumeration[Object] = {
    import scala.collection.JavaConversions._
    super.keys.toSeq.sortBy(_.asInstanceOf[String]).toIterator
}