GUI Design
Here are the variables and the graphical component each corresponds to:
| GUI Component | GUI Method | |
|---|---|---|
| int calories | JTextField | getText() |
| int fatGrams | JTextField | getText() |
| double percent | JTextField | setText() |
Each JTextField will have a JLabel and the whole GUI
will have a JLabel at the top to act as a heading.
All this is much as in the previous example.
There is something different about this GUI, though.
The user inputs two values.
The calculation should only be carried out when both values are
available.
With the previous program,
the input JTextField had a listener registered for it.
When the user typed something and hit enter,
the listener was "fired" and ran the application.
