How to make a joinable lobby?

How do i make a lobby that is joinable? ex: /example join
How do i do this? So that when i do this ex: /example start
it will only start and tp people that have joined?
Thanks

 

Connal Maby an ArrayList? Store the players name in there and teleport everyone who has there name.

 

Thanks! Good idea! Now umm, do you know how to make an array list? (I only know basics and a bit at java)
ty

 

Connal Um yes. But I would honostoy try to learn more java before a big task. Do you even know what an ArrayList is?

to make:
ArrayList<String> lobby = new ArrayList<String>();

to add players:
lobby.add(player.getName());

to remove:
lobby.remove(player.getName());

to check if there on one:
if (lobby.contains(player.getName()));

PS sorry if this came out rude, I didnt mean it to be

 

Yes i do know what an ArrayList is, and yea i really need to learn some more, thanks!

 

Connal No problem. Oh and you should mmake the ist public and static so others can use it.

 

ok thanks