Preface
Since I voted for a java back-end engineer, the interviewer didn’t ask me much language-related questions
One side March 10
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Self brief introduction
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MySQL isolation level, implementation principle, lock, index
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HTTP 与 HTTPS
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Permission realization
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redis data structure
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Process communication
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The embodiment of deadlock pessimistic lock optimism in database java
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Optimistic lock mvcc cas Pessimistic lock
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When does the Damond thread end? How will it not execute if you put a finally in it?
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AQS
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The situation is complex and the performance requirement is not high. How to choose the serializer to directly json for network transmission
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How does Nio selector implement one-to-many
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The four major features of the operating system share asynchronous virtual concurrency
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A problem with a little frog jumping off the stairs
Two sides March 13
- Interview time: 40min
- Self brief introduction
- IO model, select poll epoll, zero copy
- TCP three-way handshake, half-connection attack, four waved hands, time_wait
- Authentication realization, RBAC, table design
- MVVC for MySQL
- The reasons for the high performance of Nginx, multi-process and multi-thread
- What is the database explain slow query optimization
- Index setting rules
- File sort goup order focuses on index optimization
- Why index features are good and what are the advantages and disadvantages
- Back to the table
- The underlying principle of lambda expressions
Three sides March 16
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Introduce JVM
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Talk about JVM memory management: memory partition + garbage collection
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Talk about the generational promotion process of JVM, when will it be promoted from the new generation to the old generation
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Under what circumstances will Full GC be triggered?
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The difference between Volatile and synchronized
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Talk about Spring's AOP, right?
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How many ways are there to implement AOP proxy?
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The underlying implementation of HashMap;
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Talk about the difference between JDK1.7 and JDK1.8;
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The difference between linked list and hash table;
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Project design, module division
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How to troubleshoot code issues
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Red-black tree and B+ tree, why HashMap uses red-black tree and MySQL uses B+ tree
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Why choose RabbitMQ, how to ensure the idempotence of messages, and reliability?
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How do I usually learn...
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A question similar to reverse Poland, but the interviewer saw me writing it for 5 minutes before finishing it, so let me talk about my ideas directly.
hr noodles March 25
After a while, I called hr and said that the three sides passed. After a while, I called and said that I don’t need hr. I went directly to the offer approval stage. After waiting for three days, the offer was finally sent.
At last
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