advanced cooldown?

What have you tried so far?

 

@T0X1C use longs and unix timestamps.

 

Are you looking for something like that? Be careful, I didn't test it so much

Code (Text):

HashMap<Player, Long> lastUsage = new HashMap<Player, Long>();
    long cooldown = 4000L; //The cooldown value, taken from the config or hardcoded or whatever u want
    @EventHandler
    public void onQuit(PlayerQuitEvent e){
        lastUsage.remove(e.getPlayer()); //Clean up player information to avoid memory leaks
    }
    public long getLastUseMillis(Player player){ //Just a little function to ensure that a player will be always registered
                                                // in the map
        Long last = lastUsage.get(player);
        if (last == null){
            last = 0L;
            lastUsage.put(player, last);
        }
        return last;
    }
    @EventHandler
    public void onUse(PlayerInteractEvent e){
        //Check whatever you want
        long last =  getLastUseMillis(e.getPlayer());
        if (System.currentTimeMillis() - last < cooldown){
            e.getPlayer().sendMessage(ChatColor.RED + String.format("Slow down! You have to wait %.1fs before using this item!"
                    , (cooldown - (System.currentTimeMillis() - last)) / 1000.0f));
        }
        else{
            lastUsage.put(e.getPlayer(), System.currentTimeMillis());
            //The player is allowed to use the item; do whatever u want to do here
            e.getPlayer().sendMessage(ChatColor.GREEN + "Great! You have used the item. Now WAIT HAHAHAHHA");
        }
    }

 

Use a double and format it with Decimal Format #.#