Solved banning in gui

Hello there, I am trying to make a plugin that allows you to ban people by the GUI. The problem is: I can kick people but I cant ban them. By the way, t.setBanned(true) is deprecated

Code:

public void openOnlineGUI(Player player){
        Inventory inv5 = Bukkit.createInventory(null, 27, "Online Players");
        //Skull
        int slot = 0;
        for(Player t : Bukkit.getServer().getOnlinePlayers()){
        ItemStack skull = new ItemStack(Material.SKULL_ITEM, 1, (short) SkullType.PLAYER.ordinal());
        ItemMeta meta = skull.getItemMeta();
        meta.setDisplayName(t.getName());
         skull.setItemMeta(meta);
         inv5.setItem(slot, skull);
         slot=+1;
        
        }
        player.openInventory(inv5);

      
    }
    @EventHandler
    public void onClickOnline(InventoryClickEvent event){
        if(!(event.getInventory().getName().equalsIgnoreCase("Online Players")))
                return;
            Player p = (Player) event.getWhoClicked();
            event.setCancelled(true);
            if(event.getCurrentItem()== null || event.getCurrentItem().getType()== Material.AIR ||!event.getCurrentItem().hasItemMeta()){
                p.closeInventory();
              
                return;
            }
        }
    @EventHandler
        public void clickpl(InventoryClickEvent event){
            if(!event.getInventory().getName().equalsIgnoreCase("Online Players"))
        return;
            Player p = (Player) event.getWhoClicked();
            event.setCancelled(true);
            if(event.getCurrentItem()== null || event.getCurrentItem().getType()== Material.AIR ||!event.getCurrentItem().hasItemMeta()){
                p.closeInventory();
                return;

                  
              
          
      
    }
    switch(event.getCurrentItem().getType()){
        case SKULL_ITEM:
            ban.add(event.getCurrentItem().getItemMeta().getDisplayName());
            Bukkit.broadcastMessage(event.getCurrentItem().getItemMeta().getDisplayName());
            for(Player t: Bukkit.getServer().getOnlinePlayers()){
        if(ban.contains(t.getName())){
            t.setBanned(true);
        }
            }
            break;
            default:
                break;
        }
    }

 

Kick the player after setting them as banned.

 

you are a genius tysm