Simple ordering system
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In this project a simple ordering system is implemented in which the user has a shopping menu displayed with the following:

• Main menu:

Pizza, $40
Cheeseburger, $20
Coffee, $5
Soda, $4
Water, $2

• Takes input from the user that represents each item and its quantity.
• Adds the items with their quantities to the user’s shopping cart.
• On checkout, takes input from the user representing their payment method (PayPal or CreditCard).
• Calculates and displays the amount of the order to the user and performs the payment using the method determined by the user and displays a confirmation message of the payment status (success or failure).

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• UML diagram
• JOptionPane is used for the GUI to display and take inputs from the user
• Added abstract classes
• Added polymorphism
• Added screenshots of the run

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