public void removeAnimal(int code) {
        for (int i = 0; i < numofanimals; i++) {
            if (animal[i].getCode() == code) {
                animal[i] = null;
                for (int j = i; j < numofanimals - 1; j++) {
                    animal[j] = animal[j + 1];
                }
                animal[numofanimals] = null;
                numofanimals--;
            }
        }
    }