Need CoolDown for my Plugin (the healstick)

Code:

package fr.gravenilvec.monplugin;
import java.util.Arrays;
import org.bukkit.Material;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.block.Action;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.event.player.PlayerPortalEvent;
import org.bukkit.inventory.ItemStack;
import org.bukkit.inventory.meta.ItemMeta;
import org.bukkit.potion.PotionEffect;
import org.bukkit.potion.PotionEffectType;
public class MonPluginlisteners implements Listener {
@EventHandler
  public void onJoin (PlayerPortalEvent event){
  
    Player player = event.getPlayer();
    
    
    
    ItemStack customaxe = new ItemStack (Material.STICK,1);
    ItemMeta customM = customaxe.getItemMeta();
    customM.setDisplayName("§cHealStick");
    customM.setLore(Arrays.asList("Stick qui regen les Coeurs"));
    customaxe.setItemMeta(customM);
    
    
    player.getInventory().setItemInHand(customaxe);
    
  
    
    player.updateInventory();
    
  }
@EventHandler
public void onInteract(PlayerInteractEvent event){
    
    Player player = event.getPlayer() ;
    Action action = event.getAction();
    ItemStack it = event.getItem();
  
    if(it == null) return;
  
       if( it.getType() == Material.DIAMOND_PICKAXE) {
        if (action == Action.RIGHT_CLICK_AIR) {
        player.sendMessage("Vous Venez D'utilisez votre Pioche");
        }
    }
      
    if(it.getType() == Material.STICK && it.hasItemMeta() && it.getItemMeta().hasDisplayName() && it.getItemMeta().getDisplayName().equalsIgnoreCase("§cHealStick")){
        player.addPotionEffect(new PotionEffect(PotionEffectType.HEAL, 20*1 , 1)) ;
    }
      
      
}
}

 

Ehh.. personally, I prefer to use a Map and avoid cluttering resources with runnables. Make a Map<UUID, Long> and store the time the cooldown expires. Then when the user goes to use whatever has cooldown applied, you check if they are in the map. If so, check if the value of the map against the current time to determine if the cooldown has expired. If so, remove from map. If not, complain at user and return.