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

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

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

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

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

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

        int tmp = -1;

        for(int i = position; i < getCount(); i++)
        {
            if (_places[i] == null)
            {
                tmp = i;
                break;
            }
        }
        if (tmp != -1)
        {
            System.arraycopy(_places, position, _places, position + 1, tmp - position);
            _places[position] = tracktor;
            return position;
        }
        return -1;
    }

    @SuppressWarnings("unchecked")
    public T remove(int position) {
        if (position < getCount() && position >= 0)
        {
            T temp = (T) _places[position];
            _places[position] = null;
            return temp;
        }
        return null;
    }

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

        return (T) _places[position];
    }
}