Java Reference
In-Depth Information
Display 18.2
A Window Listener
(part 3 of 3)
70
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public static void
main(String[] args)
72
{
WindowListenerDemo demoWindow
=
new
WindowListenerDemo();
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demoWindow.setVisible(
true
);
Even if you have a window listener, you
normally must still invoke
setDefaultCloseOperation
.
75
}
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public
WindowListenerDemo()
78
{
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setSize(WIDTH, HEIGHT);
80
setTitle("Window Listener Demonstration");
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setDefaultCloseOperation(JFrame.DO_NOTHING_ON_CLOSE);
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addWindowListener(
new
CheckOnExit());
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getContentPane().setBackground(Color.LIGHT_GRAY);
JLabel aLabel
=
new
JLabel("I like to be sure you are sincere.");
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add(aLabel);
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}
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}
R
ESULTING
GUI
This window is an object of
the class
ConfirmWindow
.
When you click this close-
window button, the second
window appears.
Are you sure you want to exit?
I like to be sure you are sincere.
