PolyDraw.java(implementation of WindowListener interface)

public void windowClosing(WindowEvent e) {

System.exit(0);

}

public void windowClosed(WindowEvent e) {}

public void windowOpened(WindowEvent e) {}

public void windowIconified(WindowEvent e) {}

public void windowDeiconified(WindowEvent e) {}

public void windowActivated(WindowEvent e) {}

public void windowDeactivated(WindowEvent e) {}

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