getoneobjectatoffset

//Player class
private int ID;
public Player(int id)
{
    ID = id;
}

public void act()
{
    //move
    House h = getOneIntersectingObject(House.class);
    if (h != null)
    {
        if (h.getID() == ID) //correct house
        {
            //....
        }
    }
}

public int getID()
{
    return ID;
}

//House class
private int ID;
public House(int id)
{
    ID = id;
}

public int getID()
{
    return ID;
}

//in World subclass when you create the players and houses
addObject(new Player(0), 100, 100);
addObject(new Player(1), 200, 200);
addObject(new House(0), 200, 100);
addObject(new House(1), 100, 200);
//x and y values are examples