Listing 4: A list of abstractCar objects, displaying information about every car: 
import java.util.List;
import java.util.LinkedList;

public class showCarsInfoWildcard {    

   public static void showInfo(List<abstractCar> cars){
   for (abstractCar car : cars)
        { car.carInfo(); }
   }

   public static void main(String[] args){

   loganCar logan_1 = new loganCar();
   sanderoCar sandero_1 = new sanderoCar();
      
   List<abstractCar> mycars = new LinkedList<abstractCar>();
   mycars.add(logan_1);
   mycars.add(sandero_1);
   
   showInfo(mycars);
   }
}

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