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From: Jeff Higgins <jeff@invalid.invalid>
Newsgroups: comp.lang.java.programmer
Subject: Re: JPanel and paintComponent different results between Windows/Linux
Date: Mon, 07 Sep 2015 21:21:48 -0400
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On 09/07/2015 08:27 PM, Dark Mornings wrote:
> Hello. I have a small program that displays a bar graph of 5 bars of varying lengths. The bars display in Windows but not in Linux. I used NetBeans 8/JDK 1.8 to compile the code in Windows and OpenJDK in Ubuntu 14.04. I know paintComponent() is called because I inserted a println() statement into the body of the do-while loop and saw the output. It seems paintComponent() is called 3 times.
>
> Why does the my program work in Windows but not in Linux?
>

You have code that needs to run on the AWT event thread;

public static void main(String args[]) {
     SwingUtilities.invokeLater(new Runnable() {
       public void run() {
         new BarGraph(); // or however you want to arrange it.
       }
     });

You should handle your InputDialog cancel option.