A small note-taking applet that demonstrates how Java applets can interact with modern browser file workflows through CheerpJ. Users can open a text file from disk, edit it inside the applet, and save the result back out as a download, which all runs client-side in the browser.

The demo runs through the CheerpJ Applet Runner browser extension, which enables legacy Java applets to run in modern Chromium-based browsers without a local Java installation. To try it, install AppletRunner for Chrome or Edge, open the demo page, and enable the extension for the site.

This demo is intentionally focused to show how applet-style file upload and download behavior can be preserved in a browser sandbox, making it a useful reference for modernising legacy Java applet workflows.