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making a JFrame nonFocusable

 
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JOptionPane has methods which take a component as an argument, like this:


Anyway, when the JOptionPane is asking the user if the user wants to save the file, the frame is unusable. I want to do that to a frame. I used frame.setFocusable(false); but it didn't work. Even after I called that method, I was still able to focus on the frame by clicking it.
How can I do it?
 
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open up a modal JDialog, setUndecorated(true), setSize(0,0)

when the frame is the active window, even though you can't access it,
alt-F4 will close the dialog, then you can do whatever you want with the frame.
 
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