one side
1. What is the relationship between binary search tree and balanced binary tree, strong balanced binary tree (AVL tree) and weakly balanced binary tree
2. The difference between B tree and B+ tree, why MySQL uses B+ tree
3. How does HashMap resolve Hash conflicts?
4. The difference between epoll and poll, and its application scenarios
5. Briefly describe the principle of thread pool. What is the blocking queue used by FixedThreadPool?
6. The difference between sychronized and ReentrantLock
7. sychronized spin locks, deflection locks, lightweight locks, and heavyweight locks, respectively introduced and contacted
8. What are the problems with HTTP, what are the encryption algorithms, possible problems for different encryption methods, and
Two sides
1. What are the major categories of design patterns, and which design patterns are familiar with
2. The volatile keyword, how does it ensure visibility and order
3. Java memory structure, which parts of the heap are divided into, and how old is the default age to enter the old age
4. How does ConcurrentHashMap ensure thread safety? What's changed in jdk1.8
5. Why does the bottom layer of ConcurrentHashMap need a red-black tree?
6. How to do MySQL optimization
7. Tell me about oom and how to deal with this situation, whether you have used log analysis tools
Three sides
1. Project Introduction
2. How do you ensure data consistency between Redis cache and database?
3. Redis cache avalanche? breakdown? penetrate?
4. Which messaging middleware are you familiar with and have you done performance comparisons?
I have compiled the answers in the face into a document, which is more convenient for everyone to open and read at any time.
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Selected questions for Java interviews, architecture actual document portal: https://jq.qq.com/?_wv=1027&k=iWJZw1rp
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