Java learning framework

Under Teacher's leadership, we finally finished talking about the collection framework. Fortunately, we have seen it before. Otherwise, the course is still on the cloud! Or maybe I have no intelligence.
What do you know ??
What I want to say is: If you want to learn it at ordinary times, you just need to know how to use it and how to implement it! Under Teacher's leadership, we put map, list, arraylist, set, hashmap ...... All of them are "transferred" once. I also explained how arraylist is implemented! How can I implement it! Just use it! This interview is also the case. What about the random 7/8 tasks? YesAlgorithmThat's what I'm most afraid! It's a lot bigger! I don't know what I learned. I only learned it after I got a test. There were so many things I wouldn't know! So many things are just the same!

I still think it is too open to Java and I have learned more! I don't want to learn it! There are too many things to learn, making people nervous! When will it arrive! I also forgot to talk to you more!