ethannalvarez/Programacion-II-Project-Repository ? reverse-engineered prompt

Build me a simple Java program called LeeYOperaMejorado that helps a user enter information from the keyboard, process it, and show the results clearly on screen.

I want it to feel like a polished class project, so make the program easy to use, with clear prompts, validation for bad input, and a clean flow from start to finish. If it makes sense, include a small menu so the user can choose what to do, repeat actions, or exit when they want. Keep everything in one straightforward Java file if possible, and make sure it runs from the console without any extra setup.

If you need to check current Java syntax or best practices, look them up online. Focus on making the code readable, well organized, and reliable, with helpful messages instead of crashing when the user types something unexpected.