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One way to do that (and it's quite an advanced Java concept)
would be to create a text file (txt) which stores the entire menu.
Then write a program that would interact with the text file and print...

That's more or less what I meant. For example, if your output
is like this:

Item Quantity Price
Fries 2 0.99
Burger 1 0.99
Total: 1.98

Then for the invoice to show...

One way is to declare a integer variable to store each type of
product. Say if you had six products, you could declare six
separate integer variables which each store the quantity purchased
of...