Ch 14 – Advanced GUI Applications - SaigonTech

GUI Applications

JCheckBox

Contents

A.
Problem: An Order Calculator for the
Brandi’s Bagel House

B.
Solution

C.
Exercise: Implementing a Separate
Model

A. Problem: An Order Calculator for
the Brandi’s Bagel House

•
Brandi’s Bagel House has a bagel and
coffee delivery service for the businesses
in her neighborhood

•
Customers may call in and order white and
whole wheat bagels with a variety of
toppings

•
In addition, customers may order three
different types of coffee (Delivery for
coffee alone is not available, however)

•
Here is a complete price list

–
Bagels

•
White bagel $1.25

•
Whole wheat bagel $1.50

–
Toppings

•
Cream cheese $0.50

•
Butter $0.25

•
Peach jelly $0.75

•
Blueberry jam $0.75

–
Coffee

•
Regular coffee $1.25

•
Decaf coffee $1.25

•
Cappuccino @2.00

•
Brandi, the owner, needs an “order
calculator” application that her staff can
use to calculate the price of an order as it
is called in

•
The application should display the
subtotal, the amount of a 6% sales tax,
and the total of the order


B. Solution

1.
Developing the View

2.
Implementing Event Handlers

3.1. Implementing an event handler for the Exit
button

3.2. Implementing an event handler for the
Calculate button

2. Developing the View

•
Project name:
OrderCalculator

•
Class name:
OrderCalculatorView

•
Package:
ordercalculator

•
Frame title:
Order

Calculator

•
The Title Label

•
The Food and Drink Panel

–
The Bagel Panel

•
1 Button Group

–
The White Radio Button

–
The Whole wheat Radio Button

–
The Toppings Panel

•
4 Check Boxes

–
The Coffee Panel

•
1 Button Group

–
4 Radio Buttons

•
The Button Panel

–
2 Buttons


3.1. Implementing an event handler
for the Exit button

•
This is an exercise for you

3.2. Implementing an event handler
for the Calculate button

3.2.1. Declaring the
priceList

map and
implementing
initPriceList()

3.2.2. Implementing
getSubtotal()

3.2.3. Implementing the event handler

3.2.1. Declaring the
priceList

map and
implementing
initPriceList()


3.2.2. Implementing
getSubtotal()


3.2.3. Implementing the event handler


Exercise

•
Modify the application so that it has a
separate Model class

Solution

1.
The Design

2.
The View & Controller

3.
The Model

4.
The Data Transfer Object

1. The Design


Bill
- double subtotal
- double tax
- double total
<<Data Transfer Object>>
OrderCalculatorView
- OrderCalculator
<<View & Controller>>
OrderCalculator
<<Model>>
1
uses
uses
1
2. The View & Controller


3. The Model


4. The Data Transfer Object


References

1.
GUI Building in NetBeans IDE 5.5.
http://testwww.netbeans.org/kb/55/quicks
tart
-
gui.html

2.
Starting Out With Java 5 from control
structures to objects. Tony Gaddis