public class Main extends JavaPlugin{

	private static Main instance;
	private List<String> msgs = new ArrayList<String>();{
		msgs.add("df");
		msgs.add("dfsdwf");
		msgs.add(":doiufiuo");
		msgs.add("tyy");
	}
	private int msgNum;
	
	@Override
	public void onEnable(){
		instance = this;
		msgNum = 0;
		autoMsg(msgs);
	}
	
	public static Main getInst(){
		return instance;
	}
	
	private void autoMsg(final List<String> msg){
		Bukkit.getScheduler().scheduleSyncRepeatingTask(this, new Runnable(){
			public void run(){
				loop all players: #
                	send "(msg.get(msgNum))" to loop player #
				msgNum++;
				if(msgNum == 4){
					msgNum = 0;
				}
			}
		}, 0, 360*20);
	}
}