JFrame Exit on close Java

Question

I don t get how can I employ this code   frame setDefaultCloseOperation JFrame EXIT ON CLOSE     to close the program with the x button

User · Answer

If you re using a Frame  Class Extends Frame  you ll not get the   frame setDefaultCloseOperation WindowConstants EXIT ON CLOSE

User · Answer

I spent quite a bit of time spelunking through the internet for an elegant solution to this  As is usually the case  I found a lot of conflicting information   I finally ended with    Do not use EXIT ON CLOSE as this can leave resources behind  Do use something like the following in the JFrame initialization   setDefaultCloseOperation DISPOSE ON CLOSE    The real discovery was how to actually dispatch a window message to the JFrame  As an example  as part of your JMenuItem for exiting the application  use the following  where the function getFrame   returns a reference to the JFrame   public class AppMenuFileExit extends JMenuItem implements ActionListener          do your normal menu item code here         Override       public void actionPerformed ActionEvent e                  WindowEvent we          we   new WindowEvent  Window  App getFrame    WindowEvent WINDOW CLOSING            App getFrame   dispatchEvent we               JFrame is a subclass of Window so may be cast to Window for this purpose  And  have the following in your JFrame class to handle Window messages   public class AppFrame extends JFrame implements WindowListener        Do all the things you need to for the class     Override   public void windowOpened WindowEvent e          Override   public void windowClosing WindowEvent e        can do cleanup here if necessary         Override   public void windowClosed WindowEvent e          dispose        System exit 0          Override   public void windowActivated WindowEvent e          Override   public void windowDeactivated WindowEvent e              Override   public void windowDeiconified WindowEvent e          Override   public void windowIconified WindowEvent e

User · Answer

this setDefaultCloseOperation WindowConstants EXIT ON CLOSE     this worked for me in case of Class Extends Frame

User · Answer

You need the line  frame setDefaultCloseOperation WindowConstants EXIT ON CLOSE     Because the default behaviour for the JFrame when you press the X button is the equivalent to  frame setDefaultCloseOperation WindowConstants HIDE ON CLOSE     So almost all the times you ll need to add that line manually when creating your JFrame  I am currently referring to constants in WindowConstants like WindowConstants EXIT ON CLOSE instead of the same constants declared directly in JFrame as the prior reflect better the intent

User · Answer

If you don t have it  the JFrame will just be disposed  The frame will close  but the app will continue to run

User · Answer

If you don t extend JFrame and use JFrame itself in variable  you can use   frame dispose    System exit 0

User · Answer

The following code works for me   System exit home EXIT ON CLOSE

User · Answer

Calling setDefaultCloseOperation EXIT ON CLOSE  does exactly this  It causes the application to exit when the application receives a close window event from the operating system  Pressing the close  X  button on your window causes the operating system to generate a close window event and send it to your Java application  The close window event is processed by the AWT event loop in your Java application which will exit the application in response to the event   If you do not call this method the AWT event loop may not exit the application in response to the close window event but leave it running in the background   nbsp

[java] JFrame Exit on close Java

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