Douyin Java technology four-sided interview questions sharing: HashMap+multithreading+JVM+Redis

Douyin Java technology interview summary. I will organize them here in a certain order so that everyone can read them. Many big companies will also ask these questions, let's take a look.

 

Answers & interview topic sharing:

collection method:

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The Java side of Douyin:

1. The difference between == and equals?
2. How to override the equals method?
3. What is the role of final on classes, methods, variables, and parameters?
4. What are the commonly used data structures in Java?
5. The data structure of HashMap?
6. The realization principle of HashMap?
7. The realization principle of TreeMap?
8. The difference between HashMap and HashTable?
9. The realization principle of ConcurrentHashMap?
10. The data structure of ArrayList?
11. The realization principle of ArrayList?
12. The data structure of LinkedList?
13. How does LinkedList work?

 

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Douyin Java two sides:

1. The difference between ArrayList and LinkedList?
2. What are deep copy and shallow copy?
3. Implement a sorting algorithm by hand?
4. How many ways are there to create threads?
5. What is the difference between run() and start() methods?
6. The difference between wait and seelp methods?
7. What can cause thread blocking?
8. The difference between thread and process?
9. Multi-thread synchronization mechanism?
10. How to ensure the safety of multithreading to read and write files?
11. How to close the thread?
12. How to create a thread pool?
13. How to close the thread pool?
14. Talk about the JVM memory model?

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Three sides of Douyin Java:

 

1. Talk about dynamic loading?
2. Under what circumstances will the garbage collection mechanism be triggered?
3. Are there memory leaks in Java? Please give an example?
4. Talk about a few commonly used design patterns?
5. Tell me about your application of design patterns?
6. What data types does Redis support and when do you choose which data to use?
7. How does Redis solve the session sharing problem?
8. Tell me about your practical use of Redis?

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Douyin HR face:

• Self introduction
• Talk about your greatest strengths and greatest weaknesses
• What book to read recently?
• What offers do you have?

The above is the complete 4 interview questions of Douyin. I have compiled the answers and other BAT interviews.