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I got this issue to work, though I have other problems, but I'm opening another thread for that.

Ok, here's an even shorter version of the program that just focuses on a JComboBox and a File and stuff. It doesn't have the JFileChooser stuff in it. The issue may be related to just JComboBox...

Ok, now it will add the stuff with the new code but it is adding everything to the combobox and it shouldn't. I think it is adding it when the thing is blank, then it is somehow removing the first...

I've tried a ton of stuff including catching exceptions and SwingUtilities but it's still throwing those errors. I found that I don't need to check for a changedUpdate(), only insert and remove,...

I replaced the JTextField in the JFileChooser with a JComboBox.

It is supposed to store all the files that start with the text in the first row of the JCombobBox (kind of like the text field on...

I figured out how to add a delete key, which is what I originally made the thing for, to see if I could do it.

Now, I replaced the JTextField where you put in the file name and put in a...