The class Cashier generates an Order. Its takeOrder method accepts user input from the keyboard to generate the Order. This is a sample run (the user inputs are underlined ):

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The interface must meet the following requirements: The menu is displayed at the start of the input, and after that only when requested. o Inputs end with the Enter key. o Entering e as a command ends the order. o Entering a valid item number causes the Cashier to ask for the quantity of that item. o Entering anything else as a command causes the menu to reprint. o Items may be requested many times, and their quantities are incremented with each request - i.e. they should appear only once in the receipt. o Only quantities greater than 0 are recorded. Any other value entered for a quantity is ignored. o Print Not a valid number on any bad command or quantity input. o Print a receipt when the order ends. o An order may be empty. You may write as many private helper methods for Cashier as you like.