Preface
I am 38 years old this year. Before I became unemployed, I was the technical director of a well-known Internet company in a second-tier city in the south. I am happy and have a son and a daughter under my knees. In Qian’s house, my wife takes care of the baby at home full-time. All the expenses of the family are all counting on my salary. I never thought that unemployment would come to me. When I told my mother the news, my mother cried:" Such a good job is gone, I thought you would work there for a lifetime." The wife said, "With your technical ability, you will always find a good job. Don't be discouraged."
In this way, I embarked on the process of re-applying unsuspectingly. Although I was more confident in my abilities, I still walked on three legs in order to attack at the same time to ensure the final success rate.
① For the top 3 large companies in the delivery industry, because they have good resumes before, they can always receive interview notices after submitting some resumes. Every time I can chat in full swing, I will go back and wait for the notice. But I didn’t see the offer notice.
② After Top3 hit the wall, I lowered my expectations, and delivered small Internet and startup companies. I was criticized by various HRs, saying that it was too old for the company to support a highly paid person like me.
③ Due to the nature of the industry, my other way is to find acquaintances to refer me. This has the best effect, but the only point is that the salary and benefits, job responsibilities, etc. are not in line with my wishes.
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These are questions that are often asked in interviews with first-line Internet companies such as Tencent, ByteDance, Meituan, and Ali. I have classified these knowledge points according to the knowledge framework, so that you can check and review them easily. Familiar with the knowledge points in the materials will greatly increase the probability of passing the first two rounds of technical interviews.
Because there are many interview questions involved, the length is longer, so there is a way to receive them at the end of the article!
java aspect
- Usage analysis of four Java thread pools
- How many file copy methods does Java have? Which one is the most efficient?
- Use FileChannel (file channel) to achieve fast file copy
- JVM class loading mechanism detailed JVM class loading process
- JVM class loading mechanism detailed class loader and parent delegation model
- Several ways to achieve thread synchronization in Java
- Java memory management: deep into the Java memory area
- ………………
computer network
- The soul of HTTP, consolidate your HTTP knowledge system (intensive reading is recommended)
- Analysis of HTTPS principle and its use in Android
- HTTP resumable transmission (blocked transmission)
- What is the principle of HttpDns
- Implementation of HttpDns access and global replacement
- The difference between TCP, UDP, HTTP, SOCKET
- ………………
operating system
- The difference between thread and process (what is the resource allocation)
- Process communication
- Memory space allocation
- Deadlock The conditions of the deadlock (detailed example) Methods to avoid deadlock
- ………………
Design Patterns
- Generally speaking, you know which modes you know, and you must explain the applicable scenarios
- Singleton mode, lazy man, hungry man, thread safety, double lock
- Observer mode
- Adapter mode
- Appearance mode
- ………………
android aspect (generally asked according to the project)
- android process communication
- service
- handlerThread
- handler operation mechanism 1 time
- recyclerView caching mechanism 1 time
- view redraw
- ………………
Project aspect
- Interaction between fragment and activity
- What is the safety of using webview? And js call each other
- How to ensure that there is no conflict when reading and writing files in the process of resuming transfer description
- Asynctask memory leak why the leak solution what is the debugging tool
- MFCC process recording session (Quick hands asked a lot of details and asked to write pseudo code)
- MVP
- The difference between recyclerView and listview caching mechanism too many items will memory leak
to sum up
[Android detailed knowledge point mind map (skill tree)]
I personally do Android development. I have been doing Android development for more than ten years. I am currently working as a CTO and system architect in a startup company. Although Android is not as hot as in previous years, the era of finding high-paying jobs with 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, a lot of effort was spent 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 can be seen 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 stop studying it in depth, then it is difficult to achieve real technological improvement. I hope that this systematic technical system will provide you with a direction reference.
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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 stop studying it in depth, then it is difficult to achieve real technological improvement. I hope that this systematic technical system will provide you with a direction reference.
Finally, I would like to give everyone a word and encourage each other!