I read that java applets aren't allowed to read or write to files fullstop but i can certainly read from a file so I thought my understanding of java applet security might need a little updating ...

Instead of writing a unit test or a simple Java class with a main method, you can utilize JShell, either directly at the command-line or via the /open command and a pre-written file.

All you need to do is compile your Java code into a WASM binary file, and the browser takes care of the rest. Java, WebAssembly and the browser In this tutorial, I will show you how to write logic in ...