making "Exit" option in JMenu

I am making a contact book (for name & phone number). I am adding all contacts (as an object) in an ArrayList. I have made Save and SaveAs. I want to make "Exit" option in JMenu (in Swing menu) which when user clicks should exit the program but before exiting it should check whether file is modified, if modified it should prompt to save or discard. here is my code, but I dont think this is the right way
private void mnuExitActionPerformed(java.awt.event.ActionEvent evt) {

// TODO add your handling code here:
/*if(file is modifled)
{
JOptionPane.showConfirmDialog();
}
else
{
System.exit(0);
}*/
}

given the various number of ways to close an app e.g. alt-F4, coffee cup icon menu/close, 'X' etc, you should:
1) put your confirm close action in a windowListener's windowClosing
2) set the frame to DO_NOTHING_ON_CLOSE
3) menuItem's exit to create/process a windowClosing event

this way, however it is closed (turning off power excepted), you will be able to check if file modified etc

Thanks for your reply, I am new to this. Would you be able to write some code? Thanks

> Would you be able to write some code?

do you want my PayPal details now?

what are your charges?

charles dexter wrote:what are your charges?

You know of course that he's kidding you. Why not try to use the suggestions and make an attempt at solving your problem? You can always come back with your attempt code if it doesn't work.

> what are your charges?

my paypal remark was a 'tongue-in-cheek' comment.

most here will gladly help/nudge you in the right direction,
but frown at requests to provide complete code.

you should have no problems implementing (1) or (2),
but for (3) you need to create a new WindowEvent(...)

if you google "new WindowEvent" (including quotes),
you should find examples of how to create it, and how
to process it.

if you run into problems, post your attempt here

I am trying to make an exit button which prompts to save the modified file (if file is modified) before quitting. Now whatever option I select (Yes, No or Cancel), it saves the file.
Here is my code for closing.

private void btnExitActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
if(ExitIndex ==1)
{
JOptionPane.showConfirmDialog(this, "Save?", "Confirm", 1);
if(WIDTH == 1)
{
try
{
ObjectOutputStream outstream = new ObjectOutputStream(new FileOutputStream(path));
outstream.writeObject(myList);

//dataDisplay.append("Array written to disk file;" +path + '\n');
outstream.close();
JOptionPane.showMessageDialog(null, "Your file is saved successfully");
}
catch(IOException err1)
{
JOptionPane.showMessageDialog(null, "Sorry, " + err1.getMessage());
}

}

else
{
return;
}

}

else
{
System.exit(0);
}
}

> Now whatever option I select (Yes, No or Cancel), it saves the file.

that's the way you've coded it, assuming WIDTH does equal 1.

JOptionPane.showConfirmDialog(..) returns a static int
public static int showConfirmDialog(Component parentComponent,Object message,String title,int optionType)

so you need to check the return value to see if it is "YES".
you have it just displaying the message, and doing nothing with the return value.

and when you add the missing bit, do yourself a favor and use the variable names, not 0,1,2 etc as you've done here
JOptionPane.showConfirmDialog(this, "Save?", "Confirm", 1); which reads much better as
JOptionPane.showConfirmDialog(this, "Save?", "Confirm", JOptionPane.YES_NO_CANCEL_OPTION);

so you'll end up with something like this

Here is my approach on solving issues:

Pseudo code:

Advantages:
You know there is a single method to perform all operations

Disadvantages:
There is a single method to perform all operations

Charles, in future, please use code tags. You can edit your existing posts to incorporate the code tags by clicking on the

button