I had to do a net search to see what
triOsc was, and I found
this[
^], so I updated your question to add a Java tag.
You have shown no code at all. It's unlikely that anyone will help you, because we get "Please write this code for me" questions all the time. The challenge sketches out a high-level design, so start from there. If you have no idea what to do, then start with easier challenges.