bukkit playerjoin event

public boolean onCommand (CommandSender sender, Command cmd,  String commandLabel, String[] args) {
    String playerName = sender.getName();
if(args.lengt == 0 ){

// if they dont have anything behind of your command
          player.sendMessage(ChatColor.DARK_AQUA + "+-----------------------------+");
          player.sendMessage(ChatColor.DARK_AQUA + "Resident: " + ChatColor.AQUA + player.getDisplayName());
          player.sendMessage(ChatColor.DARK_AQUA + "Registered: " + ChatColor.AQUA + "0");
          player.sendMessage(ChatColor.DARK_AQUA + "Online: " + ChatColor.AQUA + "0");
          player.sendMessage(ChatColor.DARK_AQUA + "Total Time Online: " + ChatColor.AQUA + "0");
          player.sendMessage(ChatColor.DARK_AQUA + "Town: " + ChatColor.AQUA + "0");
            player.sendMessage(ChatColor.DARK_AQUA + "Balance: " + ChatColor.AQUA + "0" + ChatColor.GRAY + " | " + ChatColor.DARK_AQUA + "mCredits: " + ChatColor.AQUA + "0");
          player.sendMessage(ChatColor.DARK_AQUA + "Rank: " + ChatColor.RED + "0" + ChatColor.GRAY + " | " + ChatColor.DARK_AQUA + "XP: " + ChatColor.AQUA + "0");
           }else{
//if they set something behind of your command



}
          return true;
  }