Custom Gui

Hi Guys,
I got an problem with my plugin!
I want it to make that when you have an sign and you right click it you will see an gui with an diamond block. That works! Code:

Code:java

    @EventHandler
    public void onInteract(PlayerInteractEvent event){
        final Player p = event.getPlayer();
        if(p.hasPermission("class.gui")){   
 
                      Block block = event.getClickedBlock();
 
                      switch(block.getType()) {
                        case SIGN_POST:
                        case WALL_SIGN:
                        case SIGN:
                          if(((Sign) block.getState()).getLine(0).equalsIgnoreCase("[kit]")){
                              Inventory inv = Bukkit.getServer().createInventory(p, 54, "Classes");
 
                              ItemStack zero_is = new ItemStack(Material.DIAMOND_BLOCK);
                              ItemMeta zero_im = zero_is.getItemMeta();
                              zero_im.setDisplayName(ChatColor.GREEN + "Fighter" + ChatColor.WHITE + " - " + ChatColor.RED + "$100");
                              zero_is.setItemMeta(zero_im);
                              inv.setItem(0, zero_is);
 
                              p.openInventory(inv);
                          }
                          break;
                        default:
                          break;
                      }
        }
    }

But than I want it to make that when you click the diamond block you get items! But my code doesnt work! My code:

Code:java

@EventHandler
    public void inventoryclick(InventoryClickEvent e){
        if (e.getInventory().getName().equalsIgnoreCase("Classes")){
            if (e.getRawSlot() < 54 && e.getRawSlot() > -1){
                ItemStack cursor = e.getCursor();
                ItemStack itemclicked = e.getCurrentItem();
                Player p = (Player) e.getWhoClicked(); 
                e.setCancelled(true);
                if (cursor.getType() == Material.DIAMOND_BLOCK){
                    p.getInventory().addItem(new ItemStack(Material.DIAMOND_SWORD, 1));
                    p.getInventory().addItem(new ItemStack(Material.PORK, 16));
                    p.getInventory().addItem(new ItemStack(Material.ARROW, 1));
                    ItemStack bow = new ItemStack(Material.BOW, 1);
                    bow.addEnchantment(Enchantment.ARROW_INFINITE,1);
                    p.getInventory().addItem(bow);
 
                    p.sendMessage(ChatColor.RED + "[C-Kits]" + ChatColor.WHITE + "You both the " + ChatColor.YELLOW + "Fighter" + ChatColor.WHITE + " class!");
                    p.closeInventory();
                }
            }
        }
    }
 

I hope someone can help me out!
Bye!

 

ItsMees
Check if the currentitem !=null, then check what it is, then do whatever you need.