哪里可以获得有关Dictionary ADT和Skip List for Java的更多信息？

I'm trying to go deep into Dictionary ADT and Skip List for Java. My textbook doesn't cover a lot about this and whatever it has covered is very complicated. Which is the best online site to get more information on Dictionary ADT and Skip List for Java. I'm looking for the one which talks visually and gives a lot of examples.I'm trying to go deep into Dictionary ADT and S