Simple Cooldown

public class CooldownExample{
    public HashMap<String, Long> cooldowns = new HashMap<String, Long>();

    @Override
    public boolean onCommand(CommandSender sender, Command command, String label, String[] args) {
        int cooldownTime = 60; //le temps de cooldown en seconde
        if(cooldowns.containsKey(sender.getName())) {
            long secondsLeft = ((cooldowns.get(sender.getName())/1000)+cooldownTime) - (System.currentTimeMillis()/1000);
            if(secondsLeft>0) {
                // Cooldown pas fini
                sender.sendMessage("Vous devez attendre "+ secondsLeft +" secondes !");
                return true;
            }
        }

        cooldowns.put(sender.getName(), System.currentTimeMillis());
        //reste du code ici
        return true;
    }
}