findAllItems

private void buildBuyObjectElement(short itemID, int var, float buyPrice){
        Inventory inventory = playerController.player.getInventory();
        Inventory.SlotType slotType = Inventory.SlotType.Inventory;
        int[] itemLocations = inventory.findAllItems(itemID, var, slotType);
        int finalCount = 0;
        if(itemLocations.length>0) {
            for (Integer slot : itemLocations) {
                Item item = inventory.getItem(slot, slotType);
                finalCount = finalCount + item.getStack();
            }
            float amount = finalCount * buyPrice;
            playerController.player.sendTextMessage("Final count: " + String.valueOf(finalCount) + " For: " + String.valueOf(amount) + " Slots: " + Arrays.toString(itemLocations));
        }
    }