checking if a chest is full

Hello, I was wondering how I could check to see if a chest is full or not. Thank you for any help.

 

Code:

        Block b = event.getBlock();
        if (b.getType() == Material.CHEST) {
            Chest chest = (Chest) b.getState();
            Inventory inv = chest.getInventory();
            //method a: if it contains empty slots
            boolean hasEmptySlot = false;
            for (ItemStack stack : inv.getContents()) {
                if (stack == null) {
                    hasEmptySlot = true;
                    break;
                }
            }
            //method b: if it contains room for any sort of item
            ItemStack itemToAdd = new ItemStack(Material.WOOD, 4);
            int foundcount = itemToAdd.getAmount();
            for (ItemStack stack : inv.getContents()) {
                if (stack == null) foundcount -= itemToAdd.getMaxStackSize();
                if (stack.getType() == itemToAdd.getType()) {
                    if (stack.getDurability() == itemToAdd.getDurability()) {
                        foundcount -= itemToAdd.getMaxStackSize() - stack.getAmount();
                    }
                }
            }
            boolean canContainitem = foundcount <= 0;
        }

I decided to just show both examples: one to check for a 100% empty slot and one to check if an item can be added to the chest.

 

thank you!