public Spolka getActiveCompany(){
       for(Spolka s : this.getSpolki())
       {
           System.out.println("active Company1" + " s.getSymbol(): " + s.getSymbol() + " this.getActiveCompanySymbol() " + this.getActiveCompanySymbol());
           if(s.getSymbol().equals(this.getActiveCompanySymbol()))
           {
               System.out.println("active Company2");
               return s;
           }
       }
       return null;
   }