Programming Assignment #1 Solution

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Objectives: To practice event-driven programming using Java-based GUIs. To refresh your basic Java skills.

Description: Develop a Java program that creates a standalone GUI application (not an applet) that simulates an e-store which allows the user to add items (books) to a shopping cart and once all items are included, total all costs (including tax), produces an invoice, and append a transaction log file.

Your program development must include the following steps:

  1. Create a main GUI containing the following components:

    1. An area that allows the user to input data into the application along with the descriptive text that describes each input area.

    2. A total of six buttons as shown below with functionality as described below.

    3. As illustrated below, the various buttons on the interface are only accessible at certain points during a user’s interaction with the e-store.

  1. An input file named “inventory.txt”. This is a comma separated file which contains the data that will be read by the application when the user makes a selection. Each line in this file contains three items; a book id, a quoted string containing the book title and author’s name, and the price for one copy of the book. A sample file is provided for you on WebCourses.

  1. An output file (append only) named “transactions.txt” must be created that uniquely logs each user transaction with the e-store. The unique transaction id will be generated as a permutation of the date/time string when the transaction occurred.


Your source file shall begin with comments containing the following information:

/* Name: <your name goes here>


Input Specification: The file “inventory.txt” as described above (see example below as well).

Output Specification: Output is to appear in the specified components of the GUI and various message boxes that appear, plus the contents of the “transactions.txt” log file that will be generated.


Page 1

  1. Submit a working copy of your source code (all .java files), including your inventory.txt file, via WebCourses no later than 11:59pm Sunday September 15, 2019.

  2. Include a file that contains screen shots, similar to those illustrated below, that shows your application in action as a user interacts with your e-store to purchase books.

  3. Include a screen shot of your “transactions.txt” file showing at least the last few transactions (similar to the one shown on the last page of this document).

Additional Information:

Shown below are example screen shots of the GUI to help illustrate how your application is to operate.

1. Screen shot of the contents of an example “inventory.txt” file.

Page 2


an order –

2. Initial GUI: generates

invoice and

adds to the




Note that these

Allows for

Confirms that

buttons are not

Clears order

processing an

item once it is

the item is

initially “active”.

and starts over



– no write to


View the


order so far.

3. GUI after user specifies total number of items in the order and makes a selection for item #1.

Page 3

4. GUI after user has selected the first item and clicked the “Process Item #1” button.

Information on the book

Note that the “Confirm

purchased has been

Item #1” button is now

extracted from the

active and the “Process

inventory file and written

Item #1” button is inactive.

into the window on the

line for item #1.

  1. When the user clicks on the “Confirm Item #1” button, a confirmation information message appears on the screen.

User entered an incorrect

book ID. This message

would be displayed when

user pressed the Process

Item button. This is the

only “error” you will need

to catch.

Page 4

6. The main GUI after the user has confirmed the first item.

Note that

the buttons



Discount is based on the quantity of a item. If:

1-4 = 0%

5-9 = 10%

10-14 = 15%

>=15 = 20%

Note that the text areas

for entering the second

item information are

cleared and ready for



for previous

Subtotal should

item remains

reflect current

on display.

total of all

confirmed items.

7. User enters next item in the order.

Page 5

8. The GUI after the user has entered the information for all the items and confirmed the last item.

9. When the user clicks the “View Order” button, the following message box should appear.

Page 6

  1. When the user clicks the “Finish Order” button, the invoice message should be generated and displayed.

The date and time are used

to create the unique

transaction id in the

transactions.txt” file. For

the invoice the format is



Page 7

  1. The transaction file after order shown above was finished. Note the unique transaction ids based on the date and time.

The last transaction occurred on

08/27/2019 at 13:37 (1:37pm). See the

invoice message above. Permutation used


Page 8

  1. The transaction file after several orders have been completed. Note the unique transaction ids based on the date and time for every separate transaction. This file shows seven separate transactions.

Page 9

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