Listing 5: The list of car information, but this time using an upper bound to indicate that the showInfo method can be called with a collection of abstractCar or any other subtype of abstractCar:
import java.util.List;
import java.util.LinkedList;
public class showCarsInfoWildcard {
public static void showInfo(List<? extends abstractCar> cars){
for (abstractCar car : cars)
{ car.carInfo(); }
}
public static void main(String[] args){
loganCar logan_1 = new loganCar();
loganCar logan_2 = new loganCar();
List<loganCar> mycars = new LinkedList<loganCar>();
mycars.add(logan_1);
mycars.add(logan_1);
showInfo(mycars);
}
}
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