The Java Developers Almanac 1.4

e568. Determining When a Frame or Window Is Opened or Closed

    // Create the frame
    Frame frame = new Frame();
    
    // Create a listener for window events
    WindowListener listener = new WindowAdapter() {
        // This method is called after a window has been opened
        public void windowOpened(WindowEvent evt) {
            Frame frame = (Frame)evt.getSource();
        }
    
        // This method is called when the user clicks the close button
        public void windowClosing(WindowEvent evt) {
            Frame frame = (Frame)evt.getSource();
    
            // By default, nothing happens when the user clicks the close button.
            // To close the frame, see e565 Hiding a Frame When Its Close Button Is Clicked
        }
    
        // This method is called after a window is closed
        public void windowClosed(WindowEvent evt) {
            Frame frame = (Frame)evt.getSource();
        }
    };
    
    // Register the listener with the frame
    frame.addWindowListener(listener);

Related Examples

e559. Creating a Frame
e560. Setting the Icon for a Frame
e561. Making a Frame Non-Resizable
e562. Removing the Title Bar of a Frame
e563. Setting the Bounds for a Maximized Frame
e564. Iconifying and Maximizing a Frame
e565. Hiding a Frame When Its Close Button Is Clicked
e566. Exiting an Application When a Frame Is Closed
e567. Getting All Created Frames in an Application
e569. Determining When a Frame or Window Is Iconized or Maximized

See also: Colors    Components    Containers    Cursors    Drawing    Events    Focus    GridBagLayout    Images    Shapes    Simulating Events    Text    The Screen

© 2002 Addison-Wesley.