In part of my coding I know have this...
throw new UnsupportedOperationException("Not yet implemented");
what does that mean, and what do I do with it?

I assume that was added automatically when code completion filled in a method or interface for you?
If so, just replace that with your own code for the method. It's there as a placeholder so that if you don't fill in your own code, you will receive an UnsupportedOperationException when you call it.

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