ITEC 120 Back to Assignment index page
   
Assignment 5 - Shopping
Submit your program to the RU11 in your folder on neelix.

Description: 

You will design and implement a system which simulates items in a shopping cart. You may start with Item.java and ShoppingCart.java which you used in lab 22.

You will need to add a barcode (as instance data, an int) to Item. barcode will be a parameter passed to the constructor.

Write a new driver which will ask the user for a barcode, and, if it is a valid barcode, add the appropriate item to the cart. Quit when the user enters 0.

The driver will have a list of item names and another list of item prices associated with barcodes. In a real system, there might be hundreds of thousands of items, but in our system, we'll just use 25 items. Assume barcode 100 through 124 correspond to these items (you can copy and paste into your program):

"Tomato paste", "Chicken soup", "Candy corn", "Bag of Potatoes",
"Cheddar cheese", "Bacon    ", "Box of Donuts", "Bag of Onions",
"Orange juice", "Gallon of milk", "Butter    ", "Frozen pizza",
"Frosted Flakes","Loaf of bread", "Popcorn   ", "Pound of Coffee",
"8 oz. Yogurt", "Potato chips", "2 Liter Pepsi", "2 Liter Coke",
"Pinto beans", "Oreo cookies", "Salsa    ", "Corn chips", "Box of crackers"

and these prices:

.34, 1.23, .99, 2.39, 3.49, 2.89, 3.09, 2.49, 1.79, 2.29, 2.19, 3.89, 3.19, 1.29, 3.47, 7.58, .79, 3.29, .99, 1.19, .78, 3.59, 3.29, 2.89, 2.39

So, barcode 100 is Tomato Paste, and it costs 34 cents. Barcode 101 is Chicken soup for $1.23. Think about how you can use arrays to make the lookup of these items easy. (Use these lists in this order so that your output will be correct.)

After the user enters a valid barcode, ask them for a quantity. Then add those items to the cart array. If an item already exists in the cart array, you should not add it to the array again but instead update the quantity of the item already in the cart array. For example, if the user adds 2 boxes of donuts, but there are already 3 boxes of donuts in the cart array, you should have one element in the array which represents 5 boxes of donuts. To help you accomplish this task, you should write a .equals method for item. Two items are the same if they have the same barcode.

After the user finishes entering barcodes, print out the contents of the cart, along with the total prices of all items.

Then, sort the items by total price and print the contents again. This list will show the user how much money was spent on each item, highest cost first. To accomplish this task, you use the sort method in Sorts.java, which sorts an array of any Comparable objects. So you will need to make Item comparable, which involves writing a compareTo method.

Program displays:

Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

22
Program displays:

barcode must be between 100 and 125.

User enters:

1
Program displays:

barcode must be between 100 and 125.

User enters:

 121
Program displays:

Please enter quantity:

User enters:

 -3
Program displays:

Please enter a valid quantity:

User enters:

 2
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 105
Program displays: Please enter quantity:

User enters:

 1
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 103
Program displays: Please enter quantity:

User enters:

 2
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 102
Program displays: Please enter quantity:

User enters:

 8
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 109
Program displays: Please enter quantity:

User enters:

 3
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 105
Program displays:

Please enter quantity:

User enters:

 3
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 111
Program displays: Please enter quantity:

User enters:

 1
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 105
Program displays: Please enter quantity:

User enters:

 3
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 112
Program displays: Please enter quantity:

User enters:

 2
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 113
Program displays: Please enter quantity:

User enters:

 1
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 105
Program displays: Please enter quantity:

User enters:

 2
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 123
Program displays: Please enter quantity:

User enters:

 1
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 124
Program displays: Please enter quantity:

User enters:

 7
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 109
Program displays: Please enter quantity:

User enters:

 6
Program displays: Please enter a barcode (100 thru 125) for an item, 0 to quit

User enters:

 0

Program displays:

Shopping Cart

Barcode  Item            Unit Price    Quantity     Total
121      Oreo cookies    $3.59         2            $7.18
105      Bacon           $2.89         9            $26.01
103      Bag of Potatoes $2.39         2            $4.78
102      Candy corn      $0.99         8            $7.92
109      Gallon of milk  $2.29         9            $20.61
111      Frozen pizza    $3.89         1            $3.89
112      Frosted Flakes  $3.19         2            $6.38
113      Loaf of bread   $1.29         1            $1.29
123      Corn chips      $2.89         1            $2.89
124      Box of crackers $2.39         7            $16.73

Total Price: $97.68


Shopping Cart

Barcode  Item            Unit Price    Quantity     Total
105      Bacon           $2.89         9            $26.01
109      Gallon of milk  $2.29         9            $20.61
124      Box of crackers $2.39         7            $16.73
102      Candy corn      $0.99         8            $7.92
121      Oreo cookies    $3.59         2            $7.18
112      Frosted Flakes  $3.19         2            $6.38
103      Bag of Potatoes $2.39         2            $4.78
111      Frozen pizza    $3.89         1            $3.89
123      Corn chips      $2.89         1            $2.89
113      Loaf of bread   $1.29         1            $1.29

Total Price: $97.68   

NOTE: The input for this sample run is in the file in.txt. You can redirect input from the keyboard at the command line:

java yourprogramname < in.txt