Nashorn.java is a really cheeky implementation of a "Fractional Calculator"
that uses JavaScript's eval and the Nashorn script engine to parse and return values.
Needless to say, I wasn't allowed to submit this.
FracCalc.java is something that I made in about half an hour to satisfy Gradescope and the project requirements.
There's more where this came from in my Fractional Calculators repository