public HashMap<UUID, ItemStack[]> items = new HashMap<UUID, ItemStack[]>();
    public HashMap<UUID, ItemStack[]> armor = new HashMap<UUID, ItemStack[]>();

    public void saveInventory(Player player) {
        UUID uuid = player.getUniqueId();

        ItemStack[] contents = player.getInventory().getContents();
        ItemStack[] armorContents = player.getInventory().getArmorContents();

        items.put(uuid, contents);
        armor.put(uuid, armorContents);

        player.getInventory().clear();

        player.getInventory().setHelmet(null);
        player.getInventory().setChestplate(null);
        player.getInventory().setLeggings(null);
        player.getInventory().setBoots(null);
    }

    public void restoreInventory(Player player) {
        UUID uuid = player.getUniqueId();

        ItemStack[] contents = items.get(uuid);
        ItemStack[] armorContents = armor.get(uuid);

        if(contents != null){
            player.getInventory().setContents(contents);
        }
        else{
            player.getInventory().clear();
        }

        if(armorContents != null){
            player.getInventory().setArmorContents(armorContents);
        }
        else{
            player.getInventory().setHelmet(null);
            player.getInventory().setChestplate(null);
            player.getInventory().setLeggings(null);
            player.getInventory().setBoots(null);
        }
    }