JD internship experience (two)

1. Introduce yourself first
2. Can you use plain language to introduce the heap in the JVM (from the perspective that I don’t understand computers)
3. The area where memory overflow occurs in the JVM.
4. Introduce memory overflow, is there any way to avoid memory overflow?
5. Tell me about heap sorting.
6. Introduction to mysql storage engine.
7. Do you know why B+ tree is used for indexing?
8. Introduce the thread pool is mainly an introduction to the parameters of the thread pool.
9. Introduce some thread sleep(), will the thread release resources after sleep()?
10. Do you know the trees in the data structure (binary tree, binary search tree, balanced tree, red-black tree (say I won't))
11. The thread has several states.
12. TCP's three-way handshake and four waved hands.
13. You have what you want to tell me.
14. I forgot a lot
    of me to write it down. The overall feeling is okay, but the interviewer said that the impression of me is rather nervous, but the technique is okay.