public class SetArtilleriesGeneric<T> {
    private final Object[] _places;

    public int getCount() {
        return _places.length;
    }

    public SetArtilleriesGeneric(int count) {
        _places = new Object[count];
    }

    public int insert(T artillery) {
        return insert(artillery, 0);
    }

    public int insert(T artillery, int position) {
        if (position < 0 || position >= getCount()) {
            return -1;
        }

        if (_places[position] == null) {
            _places[position] = artillery;
            return position;
        }

        int firstNull = -1;

        for (int i = position + 1; i < getCount(); i++)
        {
            if (_places[i] == null)
            {
                firstNull = i;
                break;
            }
        }

        if (firstNull == -1)
        {
            return -1;
        }

        System.arraycopy(_places, position, _places, position + 1, firstNull - position);

        _places[position] = artillery;
        return position;
    }

    @SuppressWarnings("unchecked")
    public T remove(int position) {
        if (position < 0 || position >= getCount())
        {
            return null;
        }

        var result = _places[position];

        _places[position] = null;

        return (T) result;
    }

    @SuppressWarnings("unchecked")
    public T get(int position) {
        if (position < 0 || position >= getCount()) {
            return null;
        }

        return (T) _places[position];
    }
}