public class StatCalculation {

    public Consumer<PlayerStats> CalculateStats(Player player, final Consumer<PlayerStats> stats) {

        PlayerInventory inv = player.getInventory();


        Bukkit.getScheduler().runTaskAsynchronously(AvarionFight.getPlugin(), new Runnable() {
            @Override
            public void run() {

                ItemStack[] Content = inv.getContents();
                ItemStack[] Extra = inv.getExtraContents();
                ItemStack[] All = (ItemStack[]) ArrayUtils.addAll(Content, Extra);

                PlayerStats playerStats;

                double MeeleDamage = 0.0;
                double RangedDamage = 0.0;
                double Armor = 0.0;
                double ArmorPenetration = 0.0;
                double BlockChance = 0.0;
                double CritChance = 0.0;
                double CritDamage = 0.0;

                for (ItemStack item : All) {

                    // Leere Slots und leere Lore checken
                    if (item == null)
                        continue;
                    if (item.getType() == Material.AIR)
                    	continue;
                    if (!item.hasItemMeta())
                    	continue;
                    if (!item.getItemMeta().hasLore())
                    	continue;

                    for (String line : item.getItemMeta().getLore()) {

                        if (line.contains("Schaden")) {

                            MeeleDamage = MeeleDamage + Double.parseDouble(line.replaceAll("[\\D]", ""));

                        }

                        if (line.contains("Fernkampf")) {

                            RangedDamage = RangedDamage + Double.parseDouble(line.replaceAll("[\\D]", ""));

                        }

                        if (line.contains("Rüstung")) {

                            Armor = Armor + Double.parseDouble(line.replaceAll("[\\D]", ""));

                        }

                        if (line.contains("Durchdringung")) {

                            ArmorPenetration = ArmorPenetration + Double.parseDouble(line.replaceAll("[\\D]", ""));

                        }

                        if (line.contains("BlockChance")) {

                            BlockChance = BlockChance + Double.parseDouble(line.replaceAll("[\\D]", ""));

                        }

                        if (line.contains("Kritische Trefferchance")) {

                            CritChance = CritChance + Double.parseDouble(line.replaceAll("[\\D]", ""));

                        }

                        if (line.contains("Kritischer Zusatzschaden")) {

                            CritDamage = CritDamage + Double.parseDouble(line.replaceAll("[\\D]", ""));

                        }
                    }

                    playerStats = new PlayerStats();
                    stats.accept(playerStats);

                }

            }
        });

        // Ende Async

    }

}