java

[Jeffrey S Fineberg]

The nice thing about JOptionPane is that it allows someone to learn
programming input/output aspects in Java without needing to get involved
in event-driven programming issues of GUIs in the beginning.  I'm sure
there are differing philosophies, but I tend to agree with this approach.

Jeff


On Thu, 4 Sep 2003, John R. Ghidiu wrote:

>On Wed, 3 Sep 2003, Riga, Anthony wrote:
>
>> Anyone good at java? I am running Borland JBuilder9 on Redhat 9.0. I
>> need to write a program that uses JOptionPane class. You enter 3 numbers
>> and the program computes the sum,porduct and avg of all type int as well
>> as the average number of type double. Any Ideas? Just get me started.
>> Thanks
>
>Well, I wouldn't use a JOptionPane for that (unless you are required to).
>The option pane was not really built for that (which is not to say that
>you can't do it). I would just use a JFrame with three JTextFields, three
>JLabels (for the results) and a JButton for starting the calculations.
>Your best bet is probably to build the GUI in the form builder, double
>click on the button when you are done - this will place your cursor in the
>code where the button handler is. From here, just do something like:
>
>JLabel1.setText(/* code for sum /*);
>JLabel2.setText(/* code for product  */);
>JLabel3.setText(/* code for average */);
>
>Assuming, of course, that JLabel1, JLabel2 and JLabel3 are the labels in
>the GUI.
>
>In general, you can get the integer representation of a String (which is
>what JTextFields contain) by doing something like:
>
>int someValue = Integer.parseInt(someString);
>
>Where someString is a string. Be aware that a RuntimeException might be
>thrown when this method is called.
>
>So, to get the average, you might do something like:
>
>int average = (Integer.parseInt(JTextField1.getText()) +
>               Integer.parseInt(JTextField2.getText()) +
>               Integer.parseInt(JTextField3.getText()))/3;
>
>Where JTextField1, JTextField2 and JTextField3 are the text fields on the
>form.
>
>Hope that helps
>
>-- 
>John R. Ghidiu
>john at rmdashrf.org
>
>"Just don't create a file called -rf. :-)"
>  - Larry Wall in <11393 at jpl-devvax.JPL.NASA.GOV>
>
>
>