Thanks blackdrag, I used local private variables in the trait to configure the types:
  trait  TraitA {

   private  Map  map
  
      public void  configTrait(Map map){
     this . map =map
  }

   def  fillInMap(){
     map .put( 'car1' , 'bmw1' )
  }
}


 class  ClassA  implements  TraitA{
  Map   map  =  new  HashMap ()

   public static void  main(String[] args) {
    ClassA classA =  new  ClassA()
    classA.configTrait(classA. map );
    classA.fillInMap()
  }
}

 







 >-------- Оригинално писмо --------

 >От: Jochen Theodorou blackdrag@gmx.org

 >Относно: Re: Strong typing in traits

 >До: users@groovy.incubator.apache.org

 >Изпратено на: 17.07.2015 20:23


Am 17.07.2015 19:11, schrieb Nikolay Totomanov:

> Hello,

>

> I would like to have strong types in the traits which I use.

> For example in the trait "TraitA" i have a method fillInMap() in which I

> am adding elements to the "map" field

[...]

> traitTraitA {

>

>    deffillInMap(){

>      // here 'map' is with undefined type

>      // is there a way to "suggest" its type

>      map.put('car1','bmw1')

>      map.put('car2','bmw2')

>    }

> }



How about adding a method getMap or the like to the trait?



bye blackdrag



-- 

Jochen "blackdrag" Theodorou

blog:  http://blackdragsview.blogspot.com/