Well, it all fits in one source file, so you know it isn’t going to displace TextPad or NotePad++. Not to mention Emacs.
Currently offers a single-window text edit function, with undo/redo capability.
Bits of this code are adapted from an earlier editor ("EzEditor") used in the GUI chapter of Learning Tree’s Introductory Java Course. My version is quite a bit more fully fleshed out, and significantly modernized. Very little of the original code remains.
The icons are from
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the Java Look and Feel Guidelines download file jlfgr.jar.
As with all free software, use at own risk.
If you want a real, full-functioned window editor (not necessarily written in Java), check out NotePad++ (free, open-source, MS-Windows only) or TextPad (not free; MS-Windows only). For Unix/Linux, KDE and GNOME both feature their own window editors, and there are others (web search is your friend).