Repeating Task

I'm coding a tutorial plugin for my server, and I need a task to teleport players around the server, every 15 seconds, I'm not sure whether to do one runnable, or multiple. I'd appreciate the help.
Thanks!

 

@timtower How would I make it teleport someone to a new spot after 15 seconds?? I'm new to runnables so...

 

@timtower Show me an example please.. I'm confusing myself so much..

 

I have the player in an ArrayList, I'm trying to figure out how to the runnable part and teleporting them to multiple locations after a certain amount of time.

 

@timtower
HashMap<String, Long> time = new HashMap<String, Long>();
HashMap<String, Location> location = new HashMap<String, Location>();
Would this be the proper way to store those two?

 

@timtower
but after that one location, how would I make it teleport them to the next location after 15 seconds with the runnable? Thats the part I don't understand.

 

@timtower Would it be possible to have a list of coords and world names to teleport them to? And what exactly do you mean by "a counter" ?

 

@timtower
So lets say
I have this location "Location l = new Location(Bukkit.getWorld("world"), 120, 100, -65);"
and I make another one "Location a = new Location etc"
Could I do it that way?

 

@timtower
Would you suggest a repeating task or a delayed to do this? if repeating, I would have to cancel it right? And I still can't figure out how to do multiple locations in that list. I made a List like you said
ArrayList<Location> location = new ArrayList<Location>();