You should have seen a lot of sharing experiences of successful interviews, but according to the theory of survivor's deviation, it is more helpful for you to see where others failed in the interview.
I recently chatted with a friend. He had been preparing for a few months, and he had just participated in the ByteDance interview. After the second side, um, hung up...
So, no matter what kind of interview, no matter what the size of the interview, if you don’t want to be abused by the interviewer, you only have to max out the interview questions and make a comprehensive preparation. Of course, in addition to this, you also need to lay the foundation for yourself. Be solid, so that no matter what the interviewer’s knowledge is smashed into the dead, you can also handle it.
When chatting with a friend of mine in Alibaba a few days ago, I specifically asked the "hardcore" interviewer who developed Android for 10 years . What principles are asked in Alibaba's interviews . This article is hereby compiled, and I hope it will be helpful to everyone's interview.
BATJ big interview must ask Android principle questions
- HashMap principle
- The realization principle of ConcurrentHashMap
- HashTable implementation principle
- Do you understand the principles of broadcast transmission and reception? (Binder mechanism, AMS)
- Communication principle of traditional IPC mechanism (2 memory copies)
- The role and principle of the Binder mechanism?
- LRUCache principle
- Image loading principle
- Talk about AIDL? What is the principle?
- Talk about the principle of generics and give an example
- The principle of Handler
- The cause of memory leak caused by Handler and the best solution
- Why Looper's infinite loop will not cause the application to freeze
- The principle of AsyncTask
- The principle of ThreadLocal
- What is ANR? Under what circumstances will ANR occur? How to avoid it?
- Explain Context
- The method of thread creation in java, the working principle of thread pool
- Thread synchronization mechanism and principle, with examples
- Memory recovery mechanism and GC algorithm; GC principle and timing and GC objects
- Principles of Hot Repair
- Analysis of plug-in principle
- Constitutional principle
- ARouter routing principle:
- Distinguish the usage of Animation and Animator, and outline the principle
- Which network load libraries have you used? The realization principle of OkHttp and Retrofit?
- The principle of volatile
- synchronized principle
- The realization principle of tweening animation
- MVC MVP MVVM principle and difference
Algorithmic questions must be asked in interviews with big factories
1. What are the sorting algorithms?
2. Which is the fastest sorting algorithm?
3. Handwritten a bubble sort
4. Handwritten quick sort code
5. Quick sort process, time complexity, space complexity
6. Handwritten heap sort
7. Heap sort process, time complexity and space complexity
8. Write you Known sorting algorithm, time and space complexity, stability
9. Binary tree gives the root node and target node, and finds the path from the root node to the target node.
10 Which algorithm should I choose to sort by age for more than 20,000 Alibaba employees?
11. GC algorithm (advantages and disadvantages of various algorithms and application scenarios)
12. Ant colony algorithm and Monte Carlo algorithm
13. Substring inclusion problem (KMP algorithm) write code to achieve
14 an unordered, non-repeated array, output N Element, so that the sum of N elements is added to M, giving time complexity and
space complexity. Handwriting algorithm
15. Trillion-level two URL files A and B, how to find the difference C of A and B (hint: Bit mapping -> hash grouping ->
multi-file read and write efficiency -> disk addressing and application level Optimization of addressing)
16. How to try to find the nearest merchant function in Baidu POI (hint: coordinate mirroring + R tree).
17. Find common elements in two non-repeating array collections.
18. In two non-repeating array collections, both of which are massive amounts of data and cannot fit in the memory. How to find common
elements?
19. There are 1 million integers in a file, separated by spaces. In the program, it is judged whether the integer entered by the user is in this file
. Speak the best way
20. The memory occupied by a Bitmap and the calculation of the memory occupation
Learning welfare
[Android detailed knowledge point mind map (skill tree)]
In fact, there are so many knowledge points in Android development, and there are still a few things to ask in interviews. Therefore, there are no other tricks for the interview, just look at how well you prepare for these knowledge points. So, when you go out for an interview, it is good to see which stage you have reached in your review.
Although Android is not as hot as in previous years, the era of finding high-paying jobs with the four major components has passed. This can only show that the positions below the intermediate level of Android are saturated. Now senior engineers are still relatively lacking . Many senior positions give very high salaries (you may not be able to find a suitable one if you have more money), so I strive to become a senior engineer. is the most important.
Attached here are dozens of sets of ByteDance related to the above-mentioned interview questions, interview questions from JD.com, Xiaomi, Tencent, Toutiao, Ali, Meituan and other companies in 19 years. The technical points are organized into videos and PDFs (in fact, it took a lot of effort than expected), including knowledge + many details.
Due to limited space, I will show you a small part in the form of pictures.
The detailed arrangement is visible by clicking on GitHub;
Android architecture video + BAT interview topic PDF + study notes
There are a lot of materials for learning Android on the Internet, but if the knowledge learned is not structured, and when you encounter problems, you just taste it and don’t study it in depth, then it is difficult to achieve real technological improvement. I hope this systematic technical system can provide you with a direction reference.
There are a lot of materials for learning Android on the Internet, but if the knowledge learned is not structured, and when you encounter problems, you just taste it and don’t study it in depth, then it is difficult to achieve real technological improvement. I hope this systematic technical system can provide you with a direction reference.