This is my first Java program

I've been working hard to complete the first task on my first programming courses

How does this program work?

You simply enter your expression using Arabic or Roman numerals in the form:

Number Operator Number

For example:

Input: 3 + 5 Output: 8

Another example:

Input: X / II Output: V

Or even:

Input: IX * IX Output: LXXXI

If you're interested, I use Visual Studio Code with Java Extension pack on Fedora Linux and Java-17-openjdk