Example - Cooldown Manager v1.1

public class Sys extends JavaPlugin{
    Cooldown cd;
    public void onEnable(){
        //Cooldown Manager with automatic Cooldown Management for Command + permanent Cache Mode
        cd = new Cooldown(this, true, true, 5, "s");
        cd.addCommand("hello", "bye");
    }

    public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args){

        if(label.equalsIgnoreCase("hello")){
            if(args.length == 1){
                    sender.sendMessage("Hi "  + args[0] + "!");
                }else{
                    sender.sendMessage("Hi!");
                }
            }else{
                sender.sendMessage("Hi!");
            }
        }

        if(label.equalsIgnoreCase("bye")){
            if(args.length == 1){
                sender.sendMessage("Bye "  + args[0] + "!");
            }else{
                sender.sendMessage("Bye!");
            }
        }

        if(label.equalsIgnoreCase("doihavecooldown")){

            if(cd.hasCooldown((Player)sender)){
            String cdText = cd.returnCooldown((Player)sender);
            sender.sendMessage("Yes, you have a cooldown!");
            sender.sendMessage("Time Left: " + cdText);
            }else{
            sender.sendMessage("Sir, you don't have a cooldown!");
            sender.sendMessage("Let me add one for five seconds...");
            cd.activateCooldown((Player)sender, 5, "s");
            }

        }

        if(label.equalsIgnoreCase("doesmycommandhavecooldown")){

            if(cd.hasCooldown((Player)sender, "doesmycommandhavecooldown")){
            String cdText = cd.returnCooldown((Player)sender, "doesmycommandhavecooldown");
            sender.sendMessage("Yes, your command has a cooldown!");
            sender.sendMessage("Time Left: " + cdText);
            }else{
            sender.sendMessage("Sir, your command does not have a cooldown!");
            sender.sendMessage("Let me add one for five seconds...");
            cd.activateCooldown((Player)sender, "doesmycommandhavecooldown", 5, "s");
            }

        }
        return false;
    }
}