My cooldown not works

Whats the problem?
with the cooldown?

ArrayList<Player> cooldown = new ArrayList<Player>();

@SuppressWarnings("deprecation")
@EventHandler
public void creeperBlast(PlayerInteractEvent event) {
final Player player = (Player) event.getPlayer();

if(event.getAction().equals(Action.RIGHT_CLICK_AIR) || event.getAction() == Action.RIGHT_CLICK_BLOCK) {
if(player.getItemInHand().getItemMeta().getDisplayName() != null) {
if(player.getItemInHand().getItemMeta().getDisplayName().contains("§f§l- Creeper Blast -")) {
if(cooldown.contains(player)){
player.sendMessage("§8Cooldown> §7Please wait 5 seconds before re-using.");
return ;
}
event.setCancelled(true);

PotionEffect potionEffect = new PotionEffect(PotionEffectType.DAMAGE_RESISTANCE, 1, 10);
potionEffect.apply(player);

player.getWorld().createExplosion(player.getLocation(), 4F);

player.sendMessage("§6Used> §7You used ability §e§lCreeper Blast§7.");
cooldown.add(player);
Bukkit.getServer().getScheduler().scheduleAsyncDelayedTask((Plugin) this, new Runnable() {
public void run() {
cooldown.remove(player);
}
}, 40);
}
}
}
}

 

Save the player's name in a List<String> instead of the Player object.

 

ProStriker123 I don't know the problem. You tell me. Tell us what's wrong so we don't have to guess.

 

Using some code tags to put all that code in would be nice as well.

 

@Rocoty
well the problem it when you left click on the object its says its works after when you trying again says cooldown, after 5 sec that i needed its still keeps the cooldown

@chasechocolate
its dosent let me to do List<String> any another idea you have?

EDIT by Moderator: merged posts, please use the edit button instead of double posting.

 

Drew1080 I Thought The Bug Was on My Monitor xD [Your Signature]