Question: To ensure that a Java GUI application exits properly when its main window is closed, simply use this statement: window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) is coming up as incorrect.

To ensure that a Java GUI application exits properly when its main window is closed, simply use this statement: window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) is coming up as incorrect. Note - the posted answer - frame.SetDefaultCloseOperation (JFrame.EXIT_ON_CLOSE) is coming up as incorrect as well.

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