I can't close my swing form ...

Question

I have a JFrame swing GUI - how do I exit the app ?
How do I display a popup box with a message ? or question ?
thanks !
Craig

Answer 1

To close the frame, in the constructor, add:
addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
System.exit(0);
To pop up a prompt, add this when you click, say, "Exit" from a menu or button:
int ans = JOptionPane.showConfirmDialog(this,"Do you want to exit the application?", "ExitDialog", JOptionPane.YES_NO_OPTION, JOptionPane.QUESTION_MESSAGE);
if (ans == JOptionPane.YES_OPTION)     {
System.exit(0);
}