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Determining When a Frame or Window Is Iconized or Maximized E-mail
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Iconification and maximization events for a frame or window can be detected by adding a java.awt.event.WindowStateListener instance to that frame.

// Create the frame
Frame frame = new Frame();
    
// Create a listener
WindowStateListener listener = new WindowAdapter() {
    public void windowStateChanged(WindowEvent evt) {
        int oldState = evt.getOldState();
        int newState = evt.getNewState();
    
        if ((oldState & Frame.ICONIFIED== 0
            && (newState & Frame.ICONIFIED!= 0) {
            // Frame was iconized
        else if ((oldState & Frame.ICONIFIED!= 0
            && (newState & Frame.ICONIFIED== 0) {
            // Frame was deiconized
        }
    
        if ((oldState & Frame.MAXIMIZED_BOTH== 0
            && (newState & Frame.MAXIMIZED_BOTH!= 0) {
            // Frame was maximized
        else if ((oldState & Frame.MAXIMIZED_BOTH!= 0
            && (newState & Frame.MAXIMIZED_BOTH== 0) {
            // Frame was minimized
        }
    }
};
    
// Register the listener with the frame
frame.addWindowStateListener(listener);


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