Looking through inventory for multiple items

So by that you are searching for something that is easier than 3 loops and 3 commands or what?
Edit: Maybe provide your code so we can check through because some people may don't understand what you are trying

 

You could use the Inventory#all(ItemStack itemStack) method to count your items. A method like this should work:

Code (Text):

    private int getItemAmount(Inventory inventory, ItemStack item) { // Not tested
        return inventory.all(item).values().stream().mapToInt(ItemStack::getAmount).sum();
    }

Ofc you would still need to loop through all required items and their required amounts

Edit: (Explanation)
Inventory#all(ItemStack itemStack) returns a HashMap<Integer, ItemStack> with the 'Integer part' being the slot and 'ItemStack part' being the actual ItemStack in that slot. Then HashMap#values to get only the ItemStacks, Set#stream to get its stream and map it to an ArrayList<Integer> with the ItemStacks amount being the content of that List. The #sum method then creates the sum of all amounts

 

That's a good way but rip to the java 7 or lower people

 

Added an explanation. Thank you

Edit:
Java 8 master race xD

 

Then you could make a stream of the inventory contents and then filter the items to your needs. The part #mapToInt(ItemStack::getAmount)#sum() stays the same

 

Try asking the makers of betonquest for tips!