One side (phone)

1. Tell me about your understanding of JVM
2. What is the difference between treemap and hashmap?
3. The 5 state diagrams of Java multi-threading flow
4. The difference between mysql primary key and unique index
5. Tell me about recent projects
6. How to implement session sharing and how to use redis
7. The concept and solution of cache breakdown
8. Tell me about microservices and how to manage between microservices

Second Side (Live)

1. java nio often?The three classes used
2. Do you understand the synchronization lock in java?The difference between Countdownlauch and Cylicbarrior, in what application scenarios are they used?
3. The memory structure of the JVM?Which are shared and which are thread private?What is stored in the Java virtual machine stack?
4. How to implement a thread pool for others to use?
5. Which conditions trigger class loading in Java?
6. Handwritten code: quicksort, singleton pattern, UML class diagram of a factory and decorator pattern
7. How does AOP work?
8. How to optimize a slow query
9. What kinds of locks are there in Java?What is the difference between reentrant locks and non-reentrant locks?
10. What is the difference between Lock and synchronized?Are they all reentrant locks?Which is more efficient?
11. A rough implementation of handwritten SpringMVC DispatcherServlet

Three Sides (Live)

1. What is your usual project concurrency experience?
2. redis data structure
3. redis threading model
4. redis data elimination mechanism
5. Have you read the redis source code?
6. The principle of mysql's implementation of transactions (MVCC)
7. MQ underlying implementation principle
8. Database transaction acid, transaction operation, how to lock, distributed system lock
9. What conditions are prone to avalanches?How to solve it

Four Sides: Technical

1. Mainly a project introduction of concurrent thinking
2. Projects with high technical content, from architecture design to deployment, were asked once
3. Design Ideas for High Concurrency Architecture

Five Sides: HR Side

1. Mainly ask about the offer in hand?
2. Talk about life and future plans?
3. And related salary?

The most complete Ali Advanced Java required exam questions and answers