Code

//Serv Inv
    public void createServInventoryGUI() {
        serv = Bukkit.createInventory(null, 9, ChatColor.YELLOW + "" + ChatColor.BOLD + "Server Switcher"); // (owner, size (int), name)

        // First item
        ItemStack diamond = new ItemStack(Material.DIAMOND_SWORD, 1);
        ItemMeta diamondmeta = diamond.getItemMeta();
        diamondmeta.setDisplayName(ChatColor.RED + "Factions");
        diamondmeta.setLore(Arrays.asList(ChatColor.DARK_GRAY + "Fight and raid with your friends"));
        diamond.setItemMeta(diamondmeta);

        // Second item
        ItemStack egg = new ItemStack(Material.IRON_PICKAXE, 1);
        ItemMeta eggmeta = egg.getItemMeta();
        eggmeta.setDisplayName(ChatColor.RED + "Survival");
        eggmeta.setLore(Arrays.asList(ChatColor.DARK_GRAY + "Build your Nation!!"));
        egg.setItemMeta(eggmeta);


        serv.addItem(diamond);
        serv.addItem(egg);
}
@EventHandler
    public void interactserv(PlayerInteractEvent event)
    {
            Player p = event.getPlayer();
            if(event.getAction().equals(Action.RIGHT_CLICK_AIR) || event.getAction().equals(Action.RIGHT_CLICK_BLOCK))
            {
                    if(p.getItemInHand().getType().equals(Material.WATCH))
                    {
                            inServUse.add(p.getName());
                            event.setCancelled(true);
                            p.openInventory(serv);
                    }
            }
    }
    @EventHandler
    public void clickserv(InventoryClickEvent event)
    {
            if (event.getInventory().getSize() == 9)
            {
                    if(inUse.contains(event.getWhoClicked().getName()))
                    {
                            event.setCancelled(true);
                            Player player = (Player) event.getWhoClicked();
                            ItemStack item;
                            try
                            {
                                    item = serv.getItem(event.getRawSlot());
                            }
                            catch(Exception e)
                            {
                                    return;
                            }
                            if (item.getType() == Material.DIAMOND_SWORD)
                            {
                                player.chat("/server factions");
                            }
                            if (item.getType() == Material.IRON_PICKAXE)
                            {
                                player.chat("/server survival");
}
                            }
                    }
            }