riadbendraoua-byte/works.java ? reverse-engineered prompt

Build me a simple Java projects folder that has a couple of small beginner friendly programs, like a calculator and another practice app, and make sure they run cleanly from the command line.

I want the code to be easy to read, well organized, and actually useful for learning basic Java. If anything is missing or unclear, fill in the gaps in a sensible way so the examples feel complete. Add a short README that explains what each program does and how to run it.

If you need to check current Java syntax or best practices, look up the latest docs online.