CIS 120 GUI Lab

Overview

Given the success of all-day breakfast shops (donuts, bagels, cereal) you and your friends would like to open the latest incarnation: All day eggs!

As part of your plan you would like to have a simple way to calculate the prices---a basic breakfast order consists of two eggs, any number of toppings and one beverage. Customers should be able to specify how their eggs should be cooked, what sort of condiments they would like for their eggs, and what they want to drink (if anything). Your application should calculate the price of this order, taking into account the local sales tax rate.

GUI

[The "look and feel" of the application may be a little different depending on your platform. The one above shows the default look on a Mac platform. The windows version and linux version look slightly different.]

The price for a particular order should be determined by the following price list:

Price List
Sunnyside up	2.00
Scrambled	2.00
Over easy	1.50
Poached	2.00

Ketchup	0.20
Salt	0.10
Pepper	0.10
Cheese	1.00
Salsa	1.00

Coffee	2.00
Milk	1.50
Orange Juice	3.00

Tax rate	6%

Assignment

Your job is to write this application, contained in the class EggShop (which extends the class javax.swing.JFrame), whose single, no-argument constructor opens the 400 x 250 pixel frame shown above. The main method in this class should just use this constructor to create an instance of this class. Your window should look exactly like the one above, modulo any OS-based differences. The total price displayed at the bottom of the window should always be correct (and include sales tax) even as customers change their minds about their orders. When the window is closed, the application should terminate.

Skeleton Files

And the javadocs.

Getting started: The OptionPanel Class

Start off by completing the OptionPanel class. If you need a reminder about CheckBoxes and Radio Buttons, read this Java tutorial.

Hints:

We use a ButtonGroup object to tell Java that radio buttons should be grouped together, enforcing the rule that only one of them can be selected at a time.
Note that we chose to make the OptionPanel implement the ActionListener interface, which requires a method actionPerformed(ActionEvent e). This method gets called by Swing automaticaly when an event (mouseclick, etc.) occurs inside the OptionPanel. What do you think should happen in this method?

Finishing Up: the EggShop Class

Now, move on to the EggShop class, where you will build the actual window, as well as add the price calculation functionality.

Hints:

The five regions of the window are arranged with a BorderLayout (which we provide).
The class that contains the words "Welcome to Eggstravaganza!" is a javax.swing.JLabel. It is contained within its own JPanel, as is the text at the bottom of the window that contains the total price.

The class java.text.DecimalFormat can be used to print doubles to only two decimal places. For example:

   import java.text.DecimalFormat;
   DecimalFormat df = new DecimalFormat("0.00");
   String formatted = df.format(2.23334)
   //formatted is now "2.23"