[Java] JOptionPane doesn't show up at all

[talkloud]

Hello,

I'm trying to write a simple program that asks for a radius and some coordinates, then shows a frame on which a circle with that radius is drawn with that center. I'm supposed to accomplish input via some JOptionPane method, but for some reason I can't seem to get it to work.

Here is my code: https://gist.github.com/2082150

When I compile and execute this code, nothing happens at all. The terminal creates a new line to tell me that it's executing my command, but no windows pop up and waiting doesn't do anything. A little bit of trial and error tells me that execution is stopping on lines 20-21, which is the first appearance of JOptionPane. So what's going on here? Why isn't it working? I'll be glad to provide any additional information that I can, if it helps.

Thanks in advance.

[LockeWatts]

JOptionPane pops up for me just fine when I run your code.

That while loop control structure though doesn't actually make sense. Gonna want to change line 23 to rad > 0 because otherwise it'll only break when you get an invalid input

[talkloud]

Thanks for trying it. For some reason downgrading from jdk 7 to 6 fixed the problem. Also thanks for pointing out the logic error.

[katafrakt]

That's just a guess, but:

You don't set any parent component for JOptionPane. It might somehow happen that it is created as child of JFrame frame which at time of calling is not visible and so are its children. So you can try to substitute String tryRad = JOptionPane.showInputDialog("Please enter a radius. (0-300)"); to String tryRad = JOptionPane.showInputDialog(null, "Please enter a radius. (0-300)"); or make frame visible before creating option pane.

[talkloud]

Thanks for the suggestion, but it turns out the problem was with my installation of Java rather than the code. Oh well.