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How to gray out the files in JFileChooser?

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I only let user select the directories,
not let user select the files.

So I

myFileChooser.setFileSelectionMode(JFileChooser.DI RECTORIES_ONLY);

That is fine, but user complain about that, they want to
make sure there are files under the directory.

If I do

myFileChooser.setFileSelectionMode(JFileChooser.FI LES_AND_DIRECTORIES);

Then user will mistake select a file, which I don't let them select a
file. I need to popup a dialog says "Please select a directory only".

The idea thing is I can gray out the file names, so user can see
there are files under a directory, but they can't select any file,
only can select a directory.

Anyone out there has any idea how to gray out the file names in

Thank Q!
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Posts: n/a
continue to show only directories like you have.
but, use a filter to only show directories that contain files.

there is documentation on this in the java api docs.

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