Java - Picking one ArrayList out of many different types

Question

I'm making a grid/tile based game. Each tile on the grid has a few attributes a x position, y position, and an ID. The ID changes based on what occupies the tile. Currently, there are two different types of buildings that can occupy a tile, a command center, or a turret. If I wanted to delete a building, I would need to remove it from it's ArrayList:

ArrayList<CommandCenter> commandCenters = new ArrayList<>();
ArrayList<Turret> turrets = new ArrayList<>();

Structure IDs:

Command Center : 1
Turret : 2
...

How can I pick which ArrayList to remove from, given the ID? For example(some pseudocode):

if (square(x, y).id == 1)commandCenters.remove(index);
if (square(x, y).id == 2)turrets.remove(index);
...

Is there a way to make this less tedious, or more efficient?

Are CommandCenter's and Turrets's descendant from a parent building class? If so you could just give each tile a property of building and choose that way. — scrappedcola
– scrappedcola, Commented Jun 24, 2015 at 20:24
@scrappedcola CommandCenter and Turret are their own classes. They aren't really linked in anyway. — Arman
– Arman, Commented Jun 24, 2015 at 20:25
It would be easier and more oop if they were. Since they conceivably share some properties and methods. — scrappedcola
– scrappedcola, Commented Jun 24, 2015 at 20:26

John Kugelman · Accepted Answer · 2015-06-24 20:24:38Z

4

Have both classes extend from a Building base class.

class CommandCenter extends Building { }
class Turret extends Building { }

Then you can maintain a single list of buildings of all types.

List<Building> buildings = new ArrayList<>();

answered Jun 24, 2015 at 20:24

John Kugelman

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