java message box, how to not show multiple message box with same title or content

[oohay]

hello,
how can i prevent another message box of the same content or title from displaying again if user haven't closed the existing message box?

for example, program runs, then display a message box, program end, user don't close message box.

program runs again, display same message box again <-- how to prevent this if message box is still displayed?

thanks.

[Norm]

Is this problem with a program you are writing or is it someone else's program?

Usually when a program ends, all its stuff goes away. If there is a message box still displayed, then the program is probably still running.

Can you explain a bit more?

[oohay]

it's from a sample. it's a google desktop widget (which are js stuff) but the java part is doing some file operation, which is called by a js file, simply do a shell.Run(mycmd) where mycmd="java -jar somejar.jar somefile opt1 opt2 opt3 etc..." so the java process runs and just exit, the message box is still displayed.

here is a snippet from the class displaying the message box:
public AlertWindow(String errMsg, final int closeInterval, final String callback){
myFrame.setLocationRelativeTo(null);
myFrame.getContentPane().setLayout(new BorderLayout());
myFrame.setBackground(Color.white);
JTextArea label = new JTextArea(errMsg);
label.setEditable(false);
label.setWrapStyleWord(true);
label.setBackground(Color.white);
label.setBorder(null);
JButton ok = new JButton("OK");
ok.setMnemonic('o');
ok.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent ae){
if(callback!=null){
String surl = "https://www.someurl";
try{
Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler "+ surl);
}catch(Exception ee){}
}
System.exit(0);
}
});
label.setBounds(10, 5, 360, 50);
ok.setBounds(170, 60, 55, 25);

myFrame.getContentPane().setLayout(null);
myFrame.getContentPane().setBackground(Color.white );
myFrame.getContentPane().add(label);
myFrame.getContentPane().add(ok);
myFrame.setSize(400,130);
myFrame.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});

[Norm]

Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler "+ surl);

Must be starting a program that is independent of the java program.

What is the value of surl?

[oohay]

Yes, starting a program that is independent of the java program.

[...]
String surl = "https://www.someurl";
try{
Runtime.getRuntime().exec("rundll32 url.dll,FileProtocolHandler "+ surl);
}catch(Exception ee){}
}
[...]

[Norm]

how to prevent this if message box is still displayed

You're asking if the java program can detect if another program is running.
I don't know of any way in java. You'd have to use JNI to talk to some native code that could find out.

[oohay]

will look into JNI, thanks.