PassAnEnum

import java.util.LinkedList;

public class PassAnEnum {
    public static void main(String[] args) {
        MagicGun gun = new MagicGun();
        gun.loadWith(Ammo.PEBBLE);
        gun.loadWith(Ammo.BULLET);
        gun.loadWith(Ammo.MISSILE);
        for(int i=0; i<5; i++){
            try {
                Ammo shot = gun.shoot();
                System.out.printf("You've %s the target with a %s!\n", shot.getEffect(), shot.toString().toLowerCase());
            } catch (GunIsEmptyException e) {
                System.err.printf("click\n");
            }
        }
    }
}

class MagicGun {
    LinkedList<Ammo> ammos = new LinkedList<Ammo>();
    public void loadWith(Ammo ammo){
        ammos.add(ammo);
    }
    public Ammo shoot() throws GunIsEmptyException{
        if (ammos.isEmpty()) {
            throw new GunIsEmptyException();
        }
        return ammos.remove();
    }
}

class GunIsEmptyException extends Exception { }

enum Ammo {
  PEBBLE("annoyed"), BULLET("holed"), MISSILE("obliterated");
  private String effect;
  private Ammo(String effect) {
    this.effect = effect;
  }
  public String getEffect() {
    return effect;
  }
}