Infinite disappear-reappear loop in JFrame java

Question

As a succession to this post I\'m running into an infinite loop that causes my computer to crash. Or, well, not quite: it seems to cause the Java window (JFrame) to keep getting

Answer 1

I'm not entirely sure why you are invoking both

    getInstance().setExtendedState(JFrame.ICONIFIED);
    getInstance().setExtendedState(JFrame.NORMAL);

but if you remove the first, i.e. simply:

    getInstance().setExtendedState(JFrame.NORMAL);

then it just opens the window once, without the infinite looping you describe.

The reason your code causes an infinite loop is that it minimizes and then unminimizes the frame, which results in the windowActivated method being run: this invokes the refresh method, which invokes the bringToFront method, which minimizes and unminimizes the frame etc.

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To actually bring the window to the front, the following works for me, based upon this question:

private static void bringToFront() {                                                             
    getInstance().setVisible(true);                                                              
    getInstance().setExtendedState(JFrame.NORMAL);                                               
    getInstance().toFront();                                                                     
    getInstance().repaint();                                                                     
}