import java.util.List;

@FunctionalInterface
public interface Fleet {

    Truck createTruck();

    interface Truck {

        void add(int item) throws OverloadException;

        boolean canAdd(int item);

        int getRemainingCapacity();

        List<Integer> getItems();
    }

    class OverloadException extends RuntimeException {
        public OverloadException() {
            super("Capaciteit van voertuig overschreden.");
        }
    }

}