PIbd-23_Mochalov_D.V._Locomotive_Hard/SetLocomotivesGeneric.java

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

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

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

    public int Insert (T locomotive) {
        return Insert(locomotive, 0);
    }

    public int Insert (T locomotive, int position) {
        if (position >= _places.length || position < 0) return -1;
        if (_places[position] == null) {
            _places[position] = locomotive;
            return position;
        }

        int emptyEl = -1;
        for (int i = position + 1; i < Count(); i++)
        {
            if (_places[i] == null)
            {
                emptyEl = i;
                break;
            }
        }
        if (emptyEl == -1)
        {
            return -1;
        }
        for (int i = emptyEl; i > position; i--)
        {
            _places[i] = _places[i - 1];
        }
        _places[position] = locomotive;
        return position;
    }

    public T Remove (int position) {
        if (position >= _places.length || position < 0) return null;
        T result = _places[position];
        _places[position] = null;
        return result;
    }

    public T Get(int position)
    {
        if (position >= _places.length || position < 0)
        {
            return null;
        }
        return _places[position];
    }

}