processing path finder library

OK, I was looking at tutorials of pathfinder most wheren't even in java. IDK why youtube even placed them in my search when I clearly said java. Anyways I later decided to check processing for a path finding library, which I found. The problem is I found that it has 4 different paths but nothing telling me how to implement it myself or what special stuff it has in it. I know I wanna use the A* path finder in it.