File list (Check if you may need any files):
cert_pq2
........\.classpath
........\.project
........\.settings
........\.........\org.eclipse.jdt.core.prefs
........\bin
........\...\Cash.class
........\...\Catalog.class
........\...\CatalogTestData.class
........\...\Coffee.class
........\...\CoffeeBrewer.class
........\...\CreditCard.class
........\...\Customer.class
........\...\CustomerDatabase.class
........\...\CustomerDatabaseTestData.class
........\...\Date.class
........\...\Order.class
........\...\OrderItem.class
........\...\Payment.class
........\...\PaymentGUI$CashButtonListener.class
........\...\PaymentGUI$CreditCardButtonListener.class
........\...\PaymentGUI.class
........\...\PaymentOrder.class
........\...\Product.class
........\...\Sales.class
........\...\SalesSystemGUI$AddListener.class
........\...\SalesSystemGUI$DeleteAllItemsListener.class
........\...\SalesSystemGUI$DisplaySalesListener.class
........\...\SalesSystemGUI$RegisterSaleListener.class
........\...\SalesSystemGUI.class
........\...\SalesTestData.class
........\...\Store.class
........\...\StoreTestData.class
........\src
........\...\Cash.java
........\...\Catalog.java
........\...\CatalogTestData.java
........\...\Coffee.java
........\...\CoffeeBrewer.java
........\...\CreditCard.java
........\...\Customer.java
........\...\CustomerDatabase.java
........\...\CustomerDatabaseTestData.java
........\...\Date.java
........\...\Order.java
........\...\OrderItem.java
........\...\Payment.java
........\...\PaymentGUI.java
........\...\PaymentOrder.java
........\...\Product.java
........\...\Sales.java
........\...\SalesSystemGUI.java
........\...\SalesTestData.java
........\...\Store.java
........\...\StoreTestData.java