how to make a menu in spigot code example

Example 1: bukkit creating an inventory window

IconMenu menu = new IconMenu("My Fancy Menu", 9, new IconMenu.OptionClickEventHandler() {
            @Override
            public void onOptionClick(IconMenu.OptionClickEvent event) {
                event.getPlayer().sendMessage("You have chosen " + event.getName());
                event.setWillClose(true);
            }
        }, plugin)
        .setOption(3, new ItemStack(Material.APPLE, 1), "Food", "The food is delicious")
        .setOption(4, new ItemStack(Material.IRON_SWORD, 1), "Weapon", "Weapons are for awesome people")
        .setOption(5, new ItemStack(Material.EMERALD, 1), "Money", "Money brings happiness");

Example 2: bukkit creating an inventory window

menu.open(player);