1. • Java programming
   • FoodItem class= protected int itemCode; protected String itemName; protected float itemPrice; protected int itemQuantityinStock; protected float itemCost;
   • class Preserve extends FoodItem; private int jarSize;
   • class Vegetable extends FoodItem; private String farmName;
   • class Fruit extends FoodItem; private String orchardName;
   • class Sweetener extends FoodItems; check the output and decide about data members
   • class Inventory; protected static int numItems; protected ArrayList inventory;
   • All data members must never be public. You should make them all private unless they are in a base class AND they are needed in the child classes
   • For this assignment, we will limit the inventory array to a maximum of 20 entries
   • Notes on the FoodItem class:

     Method	Additional Information
     toString	Displays the all data members in the class
     addItem	Reads from the Scanner object passed in and fills the data member fields of the class with valid data; Method returns true if program successfully reads in all fields, otherwise returns false
     updateItem	Updates the quantity field by amount (note amount could be positive or negative); Method returns true if successful, otherwise returns false Note: itemQuantityInStock field can never be less than 0.
     isEqual	Method returns true if the itemCode of the object being acted on and the item object parameter are the same value
     inputCode	Reads a valid itemCode from the Scanner object and returns true/false if successful

   • Notes on the Fruit, Vegetable and Preserve classes, see above table for additional information on the methods with the same name.
   • Notes on the Inventory class:

     Method	Additional Information
     addItem	Adds an item to the inventory array (uses polymorphism to call addItem method in the correct derived FoodItem class for input of the fields of the FoodItem)
     alreadyExists	Returns the index of a FoodItem in the inventory array with the same itemCode as the FoodItem object in the parameter list, else returns -1
     updateQuantity	Reads in an itemCode to update and quantity to update by and updates that item by the input quantity in the inventory array. The boolean parameter is used to denote whether buying operation (true) or selling operation (false) is occurring. Method returns true/false on whether update was successful or not

   • Notes on Assign1 class:

     Method	Additional Information
     main	Main method of the program
     displayMenu	Displays the main menu to the console

2. Create a console application that will display the following menu repeatedly until the user selects the exit item. Ensure that your program will never crash nor exit in any other circumstances. The menu should be displayed again if an incorrect value is entered (i.e. a number that is not between 1-5 or any other character) after displaying the error message "Incorrect value entered". The menu should look exactly like this:

   Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 

3. When '1' is chosen by the user, the user needs to enter additional information. When the user choses to enter a fruit, the program should ask the user which kind and then ask for follow up data as in the following table:

   Do you wish to add a fruit(f), vegetable(v), Sweetener(s) or a preserve(p)?
   If f selected	Enter the code for the item: Enter the name for the item: Enter the quantity for the item: Enter the cost of the item: Enter the sales price of the item: Enter the name of the orchard supplier:
   If s selected	Enter the code for the item: Enter the name for the item: Enter the quantity for the item: Enter the cost of the item: Enter the sales price of the item: Enter the name of the farm supplier:
   If v selected	Enter the code for the item: Enter the name for the item: Enter the quantity for the item: Enter the cost of the item: Enter the sales price of the item: Enter the name of the farm supplier:
   If p selected	Enter the code for the item: Enter the name for the item: Enter the quantity for the item: Enter the cost of the item: Enter the sales price of the item: Enter the size of the jar in millilitres:
   If item code exists	Enter the code for the item: Item code already exists

   If an invalid entry is entered, display the message "Invalid entry" and ask again for the same input. If the user tries to enter a code that already exists, an error message should be displayed, entry should not continue, the program should go back to the main menu and display it again.
4. When '2' is chosen by the user, the content of the inventory array. Starting with the header "Inventory:" and then one item per line in the following format:

   For a fruit item	Item: price: $ cost: $ orchard supplier:
   For a vegetable item	Item: price: $ cost: $ farm supplier:
   For a preserve item	Item: price: $ cost: $ size: mL

   Price and cost should be formatted to 2 decimal places.
5. When '3' is chosen by the user, the program will ask the user to enter the code and then the quantity if the code is present in the inventory array. See table for full details:

   When code doesn't exist	Enter valid item code: Code not found in inventory... Error...could not buy item
   When code is found	Enter valid item code: Enter valid quantity to buy:
   If quantity is not valid	Enter valid item code: Enter valid quantity to buy: Invalid quantity... Error...could not buy item

   When no errors are encountered, the quantity for the item with the specified code is increased by the amount the user specified.
6. When '4' is chosen by the user, the program will ask the user to enter the code and then the quantity if the code is present in the inventory array. See table for full details:

   When code doesn't exist	Enter valid item code: Code not found in inventory... Error...could not sell item
   When code is found	Enter valid item code: Enter valid quantity to sell:
   If quantity is not valid	Enter valid item code: Enter valid quantity to sell: Invalid quantity... Error...could not sell item
   If quantity too large	Enter valid item code: Enter valid quantity to sell: Insufficient stock in inventory... Error...could not sell item

7. When '5' is chosen by the user, the message "Exiting..." is displayed and the program terminates.

   Sample Output: green is user input

   Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 2 Inventory: Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 3 Error...could not buy item Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 4 Error...could not sell item Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 1 Do you wish to add a fruit(f), vegetable(v),sweetener(s) or a preserve(p)? w Invalid entry Do you wish to add a fruit(f), vegetable(v),sweetener(s) or a preserve(p)? 1 Invalid entry Do you wish to add a fruit(f), vegetable(v),sweetener(s) or a preserve(p)? f Enter the code for the item: 111 Enter the name for the item: Granny Smith Apple Enter the quantity for the item: 30 Enter the cost of the item: .10 Enter the sales price of the item: .25 Enter the name of the orchard supplier: Apple Orchard Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 1 Do you wish to add a fruit(f), vegetable(v), sweetener(s) or a preserve(p)? s Enter the code for the item: 555 Enter the name for the item: Brown Honey Enter the quantity for the item: 40 Enter the cost of the item: .40 Enter the sales price of the item: 0.80 Enter the name of the farm supplier: James Farm Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 2 Inventory: Item: 111 Granny Smith Apple 30 price: $0.25 cost: $0.10 orchard supplier: Apple Orchard Item: 555 Brown Honey Sweetener 40 price: $0.80 cost: $0.40 Sweetener supplier: James Farm Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 1 Do you wish to add a fruit(f), vegetable(v), sweetener(s) or a preserve(p)? v Enter the code for the item: 222 Enter the name for the item: Orange Carrot Enter the quantity for the item: 100 Enter the cost of the item: .25 Enter the sales price of the item: 1.00 Enter the name of the farm supplier: McDonald's Farm Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 1 Do you wish to add a fruit(f), vegetable(v), sweetener(s) or a preserve(p)? p Enter the code for the item: 333 Enter the name for the item: Raspberry Jam Enter the quantity for the item: 10 Enter the cost of the item: 4.50 Enter the sales price of the item: 5.50 Enter the size of the jar in millilitres: 500 Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 1 Do you wish to add a fruit(f), vegetable(v),sweetener(s) or a preserve(p)? f Enter the code for the item: ee Invalid code Enter the code for the item: -123 Enter the name for the item: Test Enter the quantity for the item: ee Invalid entry Enter the quantity for the item: -19 Invalid entry Enter the quantity for the item: 20 Enter the cost of the item: -3 Invalid entry Enter the cost of the item: h Invalid entry Enter the cost of the item: 3.4 Enter the sales price of the item: -9 Invalid entry Enter the sales price of the item: e Invalid entry Enter the sales price of the item: ! Invalid entry Enter the sales price of the item: 3.50 Enter the name of the orchard supplier: Test Orchard Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 2 Inventory: Item: 111 Granny Smith Apple 30 price: $0.25 cost: $0.10 orchard supplier: Apple Orchard Item: 222 Orange Carrot 100 price: $1.00 cost: $0.25 farm supplier: McDonald's Farm Item: 333 Raspberry Jam 10 price: $5.50 cost: $4.50 size: 500mL Item: -123 Test 20 price: $3.50 cost: $3.40 orchard supplier: Test Orchard Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 3 Enter the code for the item: 444 Error...could not buy item Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 3 Enter the code for the item: 111 Enter valid quantity to buy: 20 Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 4 Enter the code for the item: 333 Enter valid quantity to sell: 15 Error...could not sell item Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 4 Enter the code for the item: 333 Enter valid quantity to sell: 9 Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 2 Inventory: Item: 111 Granny Smith Apple 50 price: $0.25 cost: $0.10 orchard supplier: Apple Orchard Item: 222 Orange Carrot 100 price: $1.00 cost: $0.25 farm supplier: McDonald's Farm Item: 333 Raspberry Jam 1 price: $5.50 cost: $4.50 size: 500mL Item: -123 Test 20 price: $3.50 cost: $3.40 orchard supplier: Test Orchard Please select one of the following: 1: Add Item to Inventory 2: Display Current Inventory 3: Buy Item(s) 4: Sell Item(s) 5: To Exit > 5 Exiting...