Random arena selection

So im making a minigame plugin.
In the config multiple arena's can be set.
What i want is to get all the arena's from the config and load them in a hashmap to, for example, teleport players players to an arena, remove the arena from the hashmap.
Next round teleport them again.

Or if someone knows how to get all the arena's from the config and teleport all players to a random one, that would be appreciated too.

Every help would be appreciated actually

The config will look like this:

Code:

arenaname:
  beginspawn:
    x:
    y:
    z:
    yaw:
    pitch:
  spawn 1
    x:
    y:
    z:
    yaw:
    pitch:
  spawn 2
    x:
    y:
    z:
    yaw:
    pitch:
arenaname2:
  beginspawn:
    x:
    y:
    z:
    yaw:
    pitch:
  spawn 1
    x:
    y:
    z:
    yaw:
    pitch:
  spawn 2
    x:
    y:
    z:
    yaw:
    pitch:

 

Ok, now this one
Maybe:

Code:

List<String> arenas = plugin.getConfig().getStringList("arenas");
Random rand = new Random();
int id = rand.nextInt(arenas.size());
String arena = arenas.get(id);

P.D. You may change your config and do:
arenas:
arena1:
...
arena2:
...

 

mcat95 the config like this:

Code:

Arenas:
  1:
    Spawns:
      x: etc
  2:

or like this:

Code:

Arenas:
  -Monkey
    spawns:
      x:
      etc
  -Potato

?

 

Second

 

mcat95 okay tnx