Map
    
      map = new HashMap
     
      ();    for (PriceListManager manager : yourArrayList) {        if (!map.contains(manager.getPriceListID())) {            map.put(manager.getPriceListID(), manager);        }        if (manager.isUser()) {            map.get(manager.getPriceListID()).setIsUser(true);        }        if (manager.isManager()) {            map.get(manager.getPriceListID()).setIsManager(true);        }    }    List
      
        newList = new ArrayList
       
        ();    newList.addAll(map.values());    // Do stuff with newList....