import java.util.LinkedList;

class Application {
    public static void main(String[] args) {
        Canon canon = new Canon();
        canon.fire();
        canon.fire();
        canon.fire();
        canon.fire();
    }
}

class Canon {
    public boolean loaded;

    public void fire() {
        if (loaded) {
            System.out.println("Bum");
            loaded = false;
        } else {
            System.out.println("\"no bullet in canon\"");
            loaded = true;
            System.out.println("\"bullet loaded in a cannon\"");
        }
    }
}

class Program {
    public static void main(String[] args) {
        Canon cannon1 = new Canon();
        Canon cannon2 = new Canon();
        Canon cannon3 = new Canon();
        Canon cannon4 = new Canon();

        LinkedList<Canon> cannonList = new LinkedList<Canon>();
        cannonList.add(cannon1);
        cannonList.add(cannon2);
        cannonList.add(cannon3);
        cannonList.add(cannon4);
        int licznik = 1;

        for (Canon list : cannonList) {

            System.out.println("ładowanie armaty nr: " + licznik);
            licznik++;

        }
    }
}