Whip / Flail Type Weapons

I was wondering if anyone here knows how to make any flail-type weapons. The design would be similar to a fishing rod, but the bobber/end of the whip would return to the player immediately after it hit an entity or block. I have seen a similar question posted before, but most people just said to code it using java. I am relatively new to this and I do not know how to code using java. Does anyone have any tips for how I should go about creating this or learning java?

Thanks!