Is This Code Correct????

[buffon2009]

i wanna display for example an Alert To Say good Bye When The User Click On exitCommand but the SDK gives Exception

I tried That

if(c==exitCommand){
            Thread th = new Thread() {
                public void run() {
                    
                        Alert alert=new Alert("","Good Bye",null,AlertType.CONFIRMATION);

                    alert.setTimeout(5000);
                    display.setCurrent(alert, loginForm);
                     
                }
            };
            
            th.start();
            th.notifyAll();
            quitApp();
        }

why Is That Wrong?

[raj_J2ME]

What exactly the error you are facing inside that code?
Explain the issue are you facing in much more details.

On pressing the command exit, you can simply display the alert and there is no need to put the code inside the thread,

[buffon2009]

What exactly the error you are facing inside that code?
Explain the issue are you facing in much more details.

On pressing the command exit, you can simply display the alert and there is no need to put the code inside the thread,

When i do that it display the alert but after it not exit The midlet this is the problem

[njzk2]

i presume your exception is illegalstateexception, which is raised, according to the documentation, by notifyAll() if your thread does not own the lock (which you obtain by synchronising your code block).
anyway, your code would never do what you wish, it would simply run an alert in a seperate thread and exit at the same time.
if you need a confirmation before your user exit the application, you should use a command with a commandlistener, and you don't need a thread.
by the way, what does your quitApp method does exactly ?

[buffon2009]

quitApp() method contain
destroyApp(true);
notifyDestroyed();

any way , i want the quit of midlet wait until this thread complete or any other thread

The Question is:

How to make any Process wait Until defined Thread completed That is what i want to know

thanks njzk2 for replying

[njzk2]

you don't need your process to wait until a thread completes, since all display methods are non-blocking.

basically, you probably will have to do with another type of screen to display the message, probably a Form, with a command and a command listener to actually quit

[buffon2009]

you don't need your process to wait until a thread completes, since all display methods are non-blocking.

basically, you probably will have to do with another type of screen to display the message, probably a Form, with a command and a command listener to actually quit

if(c==exitCommand){
             th = new Thread() {
                public void run() {

                        Alert alert=new Alert("","dds",null,AlertType.CONFIRMATION);

                    alert.setTimeout(5000);
                    //display.setCurrent(alert, loginForm);

                }
            };
            th.start();

            while (!th.isAlive()) {
    // Thread has not finished
               /* Alert alert=new Alert("","dds",null,AlertType.CONFIRMATION);

                    alert.setTimeout(1000);
                    display.setCurrent(alert, loginForm);*/


    // Finished
                quitApp();
}

i tried that not giving error but also doesn't work doesn't quit