1. Section 64 – Manipulating Data Using Methods – Java Swing
Chapter 3
Section 64 –
Manipulating Data Using Methods – Java Swing

2. Chapter Objectives
Use Swing components to build the GUI for a Swing program
Use the exit() method to close a Swing program
Implement an ActionListener to handle events

3. Using Swing Components
Make a copy of your BodyMass.java program.
Right click on BodyMass.java and select copy
Paste a copy – Right click on bodymasscalculator

4. Using Swing Components
Import the javax.swing.JOptionPane class
Contains methods to create dialog boxes for input, confirmation, and messages
Delete the IOException and BufferedReader code
The swing dialog boxes buffer data from the user and handle IO errors

5. Swing Dialog Boxes
Dialog boxes are created with the JOptionPane “show” methods
The showInputDialog() and showConfirmDialog return a String containing the user input

6. Swing Dialog Boxes

7. Closing Programs that use Swing
System.exit() terminates an application that displays a GUI
The command prompt window closes when this method is called
System.exit accepts an integer argument that serves as a status code
0 indicates successful termination
1 indicates abnormal termination

8. Saving, Compiling, and Running the Swing Version
Compile the source code
Test with the same sample data for all versions to compare output results
If incorrect or unrealistic data is entered by the user, errors will occur
Errors and exception handling will be discussed in a later chapter

9. Summary
Java Swing code allows the programmer to easily display pop up windows to get input and to display output.

10. Rest of Today Complete the swing version of the Bass Mass Calculator
Test your results
Show me the program when it is complete