How to programmatically close a JFrame

Question

What\'s the correct way to get a JFrame to close, the same as if the user had hit the X close button, or pressed Alt+F4 (on W

Answer 1

If you have done this to make sure the user can't close the window:

frame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

Then you should change your pullThePlug() method to be

public void pullThePlug() {
    // this will make sure WindowListener.windowClosing() et al. will be called.
    WindowEvent wev = new WindowEvent(this, WindowEvent.WINDOW_CLOSING);
    Toolkit.getDefaultToolkit().getSystemEventQueue().postEvent(wev);

    // this will hide and dispose the frame, so that the application quits by
    // itself if there is nothing else around. 
    setVisible(false);
    dispose();
    // if you have other similar frames around, you should dispose them, too.

    // finally, call this to really exit. 
    // i/o libraries such as WiiRemoteJ need this. 
    // also, this is what swing does for JFrame.EXIT_ON_CLOSE
    System.exit(0); 
}

I found this to be the only way that plays nice with the WindowListener and JFrame.DO_NOTHING_ON_CLOSE.