LAB PROJECT 03: Java GUI – Rainfall Statistics

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. Create 
Arrays to store data of the same data type in memory
8. Use a Try Catch Block to perform input error handling.

Program Specifications:
Create a Java GUI program that will allow the user to enter each month's amount of rainfall (in inches) and calculates the total and average rainfall for the year. The total and average rainfall is displayed on the screen

 

Pre-requisites:
1. Create a folder on your desktop Project-3

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-2 folder
a. Select File-> Switch Workspace
b. Browse and select your Project-2 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.

      

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 RainfallStatistics

2.   Create the MainApp using JFrame
a.  Right click on the src folder.  Select New-> Other

       

b.   Scroll down.  Expand the Windows Builder folder. 
 Select JFrame and click Next

           

c.   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. Resize the Frame to 380 x 380 by using the frame handles.
     c. Set the resizable property to “false”. Uncheck box
     d. Add the title property “Rainfall Statistics”

d. Click inside the frame container.   Note:  You will see the square corner handles

       

3.  Create the Layout
 a.
Select and click 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 screenshot). 
 Resize the label by using the corner handles
 Position the label on the screen

c.   In the Properties panel, set the Tahoma Font size to 14
 Note:  Create all of the labels as shown below

d.   Create the Text Field boxes for the Months
1. Select JTextField and drag the component into the content pane.
2. Select to highlight the TextField box. 
    Resize the text box by using the corner handles
    Position the text field boxes
3. In the Properties Panel under Variable, name the text box (see list below)
4. Set the Tahoma Font size to 14
    Note:  Create all of the 12 Text Field Boxes and name them as follows: 
           IMPORTANT: Verify the text box names are correctly entered.
            txtJan     txtJul
            txtFeb     txtAug
            txtMar     txtSep
            txtApr     txtOct
            txtMay    txtNov
            txtJun     txtDec


Create the Text Field boxes for the Total and Average Rainfall
1. Select JTextField and drag the component into the content pane.
2. Select to highlight the TextField box. 
    Resize the text box by using the corner handles
    Position the text field boxes
3. In the Properties Panel under Variable, name the text box (see list below)
4. Set the Tahoma Font size to 14
5. Set the editable to False
    Note:  Create all of the 2 Text Field Boxes and name them as follows: 
         txtTotalRainfall
         txtAvgRainfall




6.  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).
    Select to highlight the buttons. 
    Resize the buttons by using the corner handles
    Position the buttons

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:
btnCalc                    15 Bold          Calculate
btnClear                   15  Bold         Clear

 btnExit                     15  Bold          Exit

           

 

7.    Add the Tab Order of the Frame
a.  Click the Frame
b.  Select Tab Order button
c.  Click on Deselect all
d.  Click on the text field checkbox and organize txt field starting from Jan to Dec by using the Up & Down button
e.  Click on the Ok button

        

 

B.  Add the Event Code for the btnCalculateGrade 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 btnCalculateGrade 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 test data.

Submit:

1.  REQUIREMENT:  You will need to submit a screenshot of the JFrame Main App Design Mode in Project-03 Folder to receive points on this project

 

2.  Zip up (compress) the Project-03 folder

3.  Upload the zip folder to the Desire2Learn Java GUI  Project’s Project-03 drop box.