LAB
PROJECT 1: Java GUI- BMI Calculator
Goal: In this project
exercise, you will learn how to:
1.
Install the Java
Eclipse Windows Builder software
2. Create a Java GUI application using the JFrame
Library Classes.
3. Use an Absolute
Layout to construct the content Pane
of the GUI window
4. Add JLabel, JTextBox and JButton components to the
content Pane
5. Add the Event
Code to the JButton
6. Declare the Variables
7. Use a Try
Catch Block to perform input error
handling.
Program
Specifications:
Create
a Java GUI program that will calculate the Body Mass Index (BMI) of a
patient. Store and assign the data -
patient name, age, height (inches) and weight (pounds) in variables. Display the patient’s BMI results on the
screen. The formula of the BMI in Standard measurements is:
BMI = (weight / (height * height)) *703
Pre-requisites:
1.
Create a folder on your desktop Project-1
2. Launch Java EE- Eclipse
Note: You will need to use the Java
Perspective Workbench for this exercise
3. Setup your Eclipse Workspace to point to the Project-1
folder
a. Select File-> Switch Workspace
b. Browse and select your Project-1 folder as your Workspace.
Software Installation Pre-requisites:
You will need to have install
the Java Eclipse
Windows Builder.
NOTE: In the LMC Computer Lab, this already has
been installed.
1. Select Help-> Install New Software
2. a. Copy and paste
the link below in the Work with box.
WindowsBuilder - http://download.eclipse.org/windowbuilder/lastgoodbuild/
b. Select All
c. Click Next and
complete the installation.
d. Select Help from the file menu and then Check for Updates
NOTE: Attached is the WindowsBuilder repository components in case installation
steps above does not work
Repository Link
Requirements:
1. Create a Java Project and name it as BMICalculatorGUI
2. Right click on the src
folder. Select New-> Other
3. Scroll down.
Expand the Windows Builder folder.
Select JFrame and click Next
4. Type MainApp
as the name for the JFrame. Click on the Finish button.
Requirements
for the MainApp Class:
A. Create the JFrame
Components
1. Click on the Design
tab
2. a. Click on the Frame
b. Set the resizable property to “false”.
Uncheck box
c. Add the title property “BMI Calculator”
d. Click inside the frame container. Note:
You will see the square corner handles
3. Create the Layout
a. Select the Absolute Layout
b. Click inside the container to create the Absolute Layout
4. Verify the Layout is set to “Absolute”
a. Click inside the container
b. In the Properties panel, Layout
should have the “absolute” value
NOTE: If not, select the value from the pull down
arrow
c. Verify that you are in the contentPane
5. Create the Labels
a.
Select JLabel and drag the component
into the content pane.
b.
Enter the text name of the label (see list
below). Resize the label by using the
handles
Resize the label by using the corner
handles
Position the label on the screen
c.
In
the Properties panel, set the Font size to 20
Note:
Create all of the 3 Labels and name them as follows:
Height
Weight
BMI
6. Create the Text Field boxes
a. Select JTextField and drag the component into the
content pane.
b. Select to highlight the TextField box. Resize the text box by using the handles
c. In the Properties Panel under Variable, name the text box (see list below)
d. Set the Font
size to 20
Note: Create all of the 4 Text Field Boxes and name them as follows:
Verify the text box names are
correctly entered.
textFeet
textInches
textWeight
textBMI
7. Add the Additional Labels
a.
Select JLabel and drag the component
into the content pane.
b.
Enter the text name of the label. Resize the label by using the handles
Resize the label by using the corner
handles
Position the label on the screen
c.
In
the Properties panel, set the Font size to 15
Note: Create all of the 3 additional
labels and name as follows:
feet
inches
pounds
8. Create the Buttons
a.
Select JButton and drag the
component into the content pane.
b.
In
the Properties Panel under Variable, enter the variable name (see below).
c.
Set
the Font Size (see
below).
d.
Enter the Text that will be displayed inside the button.
Resize the button by using the handles
Note:
Create all of the 3 buttons and name as follows
Verify the variables names are
correctly entered.
Variable Name: Font Size Text:
btnCalculateBMI 16
Bold Compute BMI
btnClear 14 Clear
btnExit 14 Exit
B. Add the Event Code for the btnCalculateBMI button
1. Right click on the button
2.
Select Add
event handler -> action -> actionPerformed
3. Below is the event code to add in the void method actionPerformed for the
btnCalculateBMI button.
NOTE: You will need to be in Source tab
section to add the event code.
4. At the top of the source code before the MainApp class, add the following:
a.
import javax.swing.JOptionPane; (Note: This is used for the Show Message
Dialog box)
b.
@SuppressWarnings("serial")
C. Add the Event Code for the btnClear button
1. Right click on the button
2. Select Add event handler -> action -> actionPerformed
3. Below is the code
to add in the void method actionPerformed for the
btnClear button.
NOTE: You will need to be in Source
tab section to add the event code.
D. Add the Event Code for the btnExit button
1. Right
click on the button
2. Select Add event handler -> action -> actionPerformed
3. Below is the code to add in the void method actionPerformed for the
btnExit button.
NOTE: You will need to be in Source
tab section to add the event code.
Test:
1. Save your Java code
2. Compile and run your Java program.
3. Verify there is no syntax, logical or run-time
errors.
4. Enter the following test data.
Height 5
ft 8 in
Weight 180 lbs
Submit:
1.
REQUIREMENT: You will need to submit a screenshot of the JFrame Main App Design Mode in Project-01 Folder to receive
points on this project.
You will also need to include the screenshot showing the expected output after
entering the test data above
2.
3. Zip up
(compress) the Project-01 folder
4. Upload
the zip folder to the Desire2Learn Java GUI Project’s Project-01 drop box.