How to control a windowClosing Event so that it doesn't hide the frame. URG

if(logIn_logOut.isEnabled()) // true if user is logged in
JOptionPane.showMessageDialog(null,"You must Logout before closing the Administrator application","Error",JOptionPane.ERROR_MESSAGE);
this.setVisible(true);
this.toFront();
else
System.exit(0)
i want to use the afore mentioned code so that if the user is Still Logged in and tries to close the application an error is displayed and the application is not affected.
but the problem is that the application hides by default and does not terminate.

make it so your frame does nothing when the when the 'X' is pressed...you can do it like this...
yourFrame.setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);

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How to control a windowClosing Event so that it doesn't hide the frame. URG

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