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<String> cannonList = new LinkedList<String>();
    cannonList.add(cannon1);
    cannonList.add(cannon2);
    cannonList.add(cannon3);
    cannonList.add(cannon4);

    for(String list : cannonList)
    {
        System.out.println("ladowanie armaty nr: ");

    }
   }
}