Question Items in Inventory

Okay so I already know about the event.getPlayer().getInventory().contains(args0) method. But the only issue I have with using this method, is that it's inefficient for what I want to use it for. Basically, I want to test if a player has NO items in their inventory at all. If the player has no items in their inventory, it will run a bunch of other code. If they do have items, it will simply tell them, "Yo. You have items!".

Is there any way I could get a method that tests if a player has no items in their inventory at all without having to type every single block and item type into blah.blah.blah.contains()? That would help a lot Thanks

 

@2008Choco

Code:

boolean b = true;
for (ItemStack stack : e.getPlayer().getInventory().getContents()) {
    if (stack != null) b = false;
}
if (b) {
//code goes here