[fixt] [closed]Signtekst Editor by Command

I know the basics,
how commands works, inport events...

but now i think i found the problem:
My sign doesnt change!!
if i use bukkit.broadcastMessage("Hoi") he send it. but

Sign.setLine(1, "hoi")

doesnt work, i tried other numbers, other strings... but he never change the sign text

Q: How do i change the tekst?

Code:

    @EventHandler(priority = EventPriority.HIGHEST)
    public void Klik(PlayerInteractEvent e){
        Player pl = e.getPlayer();
        if(e.getAction().equals(Action.LEFT_CLICK_BLOCK) || e.getAction().equals(Action.RIGHT_CLICK_BLOCK)){
            Block bl = e.getClickedBlock();
            if(bl.getType().equals(Material.SIGN) || bl.getType().equals(Material.SIGN_POST) || bl.getType().equals(Material.WALL_SIGN)){
                Sign s = (Sign)bl.getState();
                if(e.getAction().equals(Action.LEFT_CLICK_BLOCK) && !pl.isOp()){
                    e.setCancelled(true);
                }
                int f = -1;
                for(int i = 0; 1 < s.getLines().length; i++){
                    if(s.getLine(i).toLowerCase().contains("[score]")){
                        f = i;
                        break;
                    }
                }
                if(f!=-1){
                    s.setLine(0, "Hoi Ik ben Tim");
                }
            }
        }
    }

why is this not working?

 

A BlockState is completely independent from the world, i.e. changes to the state won't change the world. You have to call the state's update() method to make the changes affect the world.

 

i get it
sign.setline(0, "hoi");
sign.update();

TY