After 20 days' interview, I finally joined Ali (share the interview process)

classmate , This is an interview summary , It is an article starting from myself , Put the problems encountered during the interview , And some small suggestions , Hope to have some help for you who are interviewing or will be interviewing .

Background description

First describe the background , The landlord is a 4 More than years of experience Android Development Engineer , Serve successively in 3 Internet companies , Are engaged in Android Development work . Before leaving, I had worked in the last company for nearly 3 Years of time .

Why do you want to leave ？

In fact, this problem has never been a single problem , It must be a multi-dimensional problem . For me , Mainly reflected in the following aspects .

• 1. The technology currently used is not very big for itself .
• 1. The development space of the current project has reached a bottleneck .
• 1. I think my career experience needs a big factory experience .
• 1. I didn't really want to say this , But it is also a point that I care about , That is, the organizational structure changes frequently , Lead to frequent changes in business lines , This is bad for the business , Need to run in all the time .

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Interview objectives

In fact, the interview goal was not single , For example, my interview objectives are sorted as follows

• Alibaba > headlines > Meituan > millet

The interview time

• 2021-03-01 ~ 2021-03-24 in total 24 Time of day , A picture is posted here to prove

Preparation cycle

• 2020-12-01 ~ 2021-02-28 in total 2 Months A little more time

Interview ideas

The interview process is a Self examination The process of , The same is also a Very particular about the way The process of , Next, we will elaborate through these two aspects .

Self examination Technical strength is the premise of the interview , You need to know yourself very clearly , Know the position you want to interview , This is a prerequisite for the success of the interview .

Like my working hours 4 More years , The position I want to interview is senior Android The engineer , Can my own quality meet the requirements of the interview position ？

In fact, I was not sure about this when I just interviewed , Because in the company has 3 year , In fact, I don't understand the development of the outside world during this period of time , So I did the following things .

• 1. Make an overall summary of the project business they are responsible for .
• 1. Summarize all technologies used in the project as a whole .
• 1. Review common frame / System Source code , such as Glide,Okhttp,Reteofit,Activity Start process ,Hander,HashMap, Lock and other commonly used source code principles .
• 1. see BOSS, Check the skills required by the corresponding position .

Ways and means Even if you are good at the interview , Rich project experience , You also have some knowledge blind spots , There are also technical points that have not been taken into account , When these points appear together, your interview success rate will be greatly reduced . So for the interview, I summarized the following processes .

• 1. The interview is divided into 3 Stages （ initial stage , Mid - , high offer period ）.

initial stage Mainly through （BOSS, Just pull the hook and deliver it ）, At the beginning, it was mainly delivered to small companies , This part of the company has two purposes . The first is to exchange technical points with each other , Constantly improve their technical coverage . The second is to understand the demand points of the current market .

Mid - Mainly through headhunters to deliver , This stage is mainly delivered to the midfield , Such companies require deeper technical depth than initial companies , The investigation of the algorithm will aggravate , At the same time, the technical level of the interviewer will also be higher , Even some midfield interview difficulty will reach the level of the big game , This interim period should last as long as possible , It is very helpful for the follow-up interview experience summary .

high offer period This stage is mainly delivered to your target enterprise , Remember that the interview priority starts with the least interested company . The way of delivery is also through headhunters , This will speed up the interview process . The above junior high school is more about improving your technical coverage , And your sense of interview . In order to let you challenge the enterprise you want to go most with the best attitude , Along the way, the success rate of your interview will be greatly improved .

• 1. communication skills

In addition to examining your technical strength in the interview , Another point is more important , That's communication skills , The higher the position you interview , The higher your communication skills are .

Communication is a particularly important point , This determines whether you can fully explain what you know and want very clearly .

The process of our interview is a process of self marketing , So when you feel that your communication skills are not very strong , Then you need to summarize a few points .

such as An excellent self introduction , One of the most difficult problems encountered in the project , If you are asked to design an architecture, how should you design , Briefly introduce the business you are responsible for etc. ..

• 1. Interview frequency

Interview cycle I suggest 15-30 God .

initial stage A small company , I suggest a one-day interview 3 individual , If you have energy, you can 4 individual , Here's a little bit of attention , Small companies have a lot of unreliable , For example, use Eclipse Of , For example, you attack your before you ask for technology , This can find a chance to leave , Don't waste time . It is suggested to limit the interview duration to 60 Within minutes, , Don't be too fussy about details . If possible, you can turn on the recorder , It's convenient to resume at night . You repeat the offer 3-4 Days later, you will find that the interview content begins to repeat in large quantities .

Mid - At this time, I suggest a day at most 2 A company , Because midfield is usually 3 Round or more interviews , Part of it was done all the way . So you need to set aside time for two sides and three sides to facilitate full communication . Don't plan to leave when you're finished , Because one, two and three sides are completely different , One side is mainly the foundation , The second side is mainly the frame / Source code / The skills in your resume , Three sides usually talk about projects , Plan or idea .

high offer period This link requires you to wait for the opportunity according to the actual situation , Because some big factories are finished with dragon noodles , Some people make a separate appointment for each interview , But the general process of large factories is relatively slow , All in 1 More than weeks to complete the whole interview . Be in commonly 4-6 Between faces . However, it is recommended to arrange at most 2 Interview , There will be many uncertainties about the length of the interview . If the interviewer doesn't hate you very much , Usually in 60 Minutes or more .

The specific process of each company

I have interviewed about 20 companies , Finally I got 8 individual offer about , Finally, I chose the company I wanted to go to most Alibaba , The interview content is also briefly summarized , In two parts .

• High frequency problem area

• Company interview experience sharing

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High frequency problems

• 1. HashMap 1.7,1.8 The difference of ,1.8 Under what circumstances is it converted to red black tree , The meaning of parameters in constructor
• 1. What kind of Map Thread safety is guaranteed , Why? ？ConcurrentHashMap Why can thread safety be guaranteed ？1.7 and 1.8 What's the difference in principle .
• 1. How many singleton modes are there , Enumeration is not a single example , Not in singleton mode volatile What problems will it cause ？volatile What are the characteristics ？ Why? android Enumerations are not recommended in .
• 1. Glide How to realize the loading progress bar of pictures in ,Glide How is the cache designed ？ Why use weak references .
• 1. implementation and api What's the difference ？
• 1. Process of event distribution , And how to resolve sliding conflicts ？
• 1. How did this happen ？mFirstTarget Why is it a linked list ？
• 1. Customize View What processes do you need to go through ？
• 1. A Jump to B page , How to go about the life cycle of two pages ？ Under what circumstances A Of stop() Not execute .
• 1. Activity Of 4 What are the startup modes in , What's the difference .
• 1. okhttp There are several queues in the ？ What are they for ？ How to cancel a request ？
• 1. Rxjava in map and flatMap What's the difference? , What operators have been used .
• 1. If Rxjava Combined sending tasks , Exception occurred in intermediate task , How to deal with other tasks .
• 1. Which scenario will have a memory leak , How to detect memory leaks , How to solve . as well as leak cannery What is the internal principle ？ Why doesn't the new version need to be in Application Registered in .
• 1. How to deal with the problem of mobile phone adaptation , What are the plans .
• 1. Android9 10 11 What new features have been updated , Cannot get... In new version IMEI How to deal with .
• 1. There are two ways of data sequence words ,Serialization and Parcelable difference , If persistence requires which one
• 1. How to layer componentization , How the components communicate .
• 1. How to prevent the program from crashing , If it has arrived Thread.UncaughtExceptionHandler Whether the program can continue to run .
• 1. Handler Looper mesaageQueue message The relationship between .
• 1. Child threads must not be updated ui Well ？ When can we do that? ？ When can't . Detect at what stage the logic is initialized .
• 1. ANR What is the principle of occurrence , How to troubleshoot .
• 1. How to keep the program alive .
• 1. Say the route ARoute Implementation principle of , How to deal with the problem of too many pages and too much memory .
• 1. When are thread pools used , How to create , What do the arguments in the constructor mean ？
• 1. Process priority
• 1. Reverse output string
• 1. Merge two ordered linked lists
• 1. Remove extra spaces from the string , And the first character of the technical word is capitalized .
• 1. The path of a value in a binary tree
• 1. The difference between local broadcasting and normal broadcasting
• 1. Binary low to high
• 1. String array duplication
• 1. Binary tree Determine whether to search Binary Tree
• 1. Activity Start process ,Launcher Start process

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Company interview experience sharing

Check the inner eye （ The size of the week , Xiaozhou 1.2 times ）

Interview experience ****

• The company has a good interview experience , Three rounds of interviews , The technical side is two-sided ,HR one side .

• The technical level of the interviewer on one side is very good , It is at the same level as the big factory , The details of the investigation were up to standard , They are all points for attention , I didn't mean to make things difficult , The communication process is also very pleasant .

• On the other hand leader Noodles , Relatively pay attention to the overall structure , Communication is also relatively smooth .

• HR Actually, the experience is not very good , The introduction of company policies is not very professional , Always by digging , It's a bit like squeezing toothpaste to communicate , The salary is fair to tell the truth . Medium to low .

• Overall, the experience was quite good , Because this is the first company to interview , It belongs to warm-up , Learned a lot , Thank you in particular 1 Face to face with the interviewer .

Beijing fluid network technology Co., Ltd

Interview experience ***

• The interview is 1306 Lightning box Department , There are three sides . Two round technology , Round HR.

• one side ： One side should be the face of their colleagues , Older , Different people have different opinions on technology , It deviates from the original intention of the interview , I can't answer the questions I asked .

• for instance ： For example, I have done power optimization , The test method has passed the real machine test .

  He asked ： How to guarantee the same battery performance of multiple mobile phones ？

  I answer ： Try to use the same model , The same batch , Cell phones with similar battery cycles .

  He asked ： This does not guarantee similar battery performance .（ This question has been divorced from the original intention of the interview , There is no point in continuing to argue ）

  I asked rhetorical questions. ： How do you solve .

  He said ： They don't need power optimization .

• This power optimization is actually a relative indicator , The comparison object is the power consumption index before optimization , The more the sampling frequency, the smaller the data deviation . It is more accurate to disassemble the battery , Connect an ammeter to test .

• Two sides ： On the other hand CTO interview , Many interview questions start from the project , Architecture design , Release rhythm , And integrated links , The communication process is closer to the interview scene .

• On three sides ：HR Noodles , This process is hard for me , I can only say this HR Too professional , Her various calculations will be calculated for you , There are many algorithms to calculate your income .

  Anyway, according to her algorithm , They pay low salaries , And your comprehensive income is higher , Later, I found out that he counted the provident fund as your income .FUC****, Finally, I gave Offer But he refused directly .

Kuhua online （ Work early 10- On the evening of 10）

Interview experience *

• The company has three rounds of interviews , Two rounds of technology , Round HR Noodles , The company has to make a roast , It's too much .

• First of all, the recruiter communicated well when he called you , Say about the turnover of the company 10 Billion , Take the headlines , Tencent and other first-line traffic docking , Fool you into accepting their interview .

• one side ： Video face , The interview lasted about an hour , The video is very regular , Good communication , No problem , The interviewer was also quite satisfied .

  But it's a waste of time that the interview can't be completed in one process , Therefore, this claim is made , The interviewer was very good, too , say HR Contact me to communicate .

  HR communicate ： Call me and tell me to go to the scene , Finish the interview process at one time .

  I asked rhetorical questions. ： Is it right to ask the second interviewer to look at the resume carefully , Avoid wasting time on both sides .

  HR feedback ： The second interviewer is very interested , Hope to go to the scene as soon as possible , So I agreed . And I had my hair done before I went .

• Two sides ： On my favorite little motorcycle , There was no traffic jam all the way , It turned out to be early . This address is actually a shopping mall , They are on the top floor of the mall , Waited a while for the interviewer , finally 2 O 'clock , Er Mian came with a sister .

  Come up and introduce yourself , Start the interview , The interviewer asked me some basic questions , My answer was OK , Asked about the expected salary , Then go out and talk about it , Then the recruitment expert told me to go back first today , And so on 3 Noodles .

  Oh my god ..... I am careless ....., I took half a day off , Straighten your hair , You came and asked 15 Minutes let me go ？？？？ The main reason is that there is no abnormal performance , There is no quarrel . What kind of trouble is this ？？？

  Then he called me again , Ask me if I have joined another company , Whether to consider the opportunity , I think about .......

  You old iron company must avoid it , Even if the recruitment expert can deceive , I can't believe it anymore ...

GamesVessel

Interview experience **

• This is a small company that makes games , Three rounds of interviews , A written test , A round of technology , Last HR, The experience of this company is not very good .

• written examination ： The written test is relatively simple , The necessity of written examination is not very great , It's all life cycle related , And the written examination content interviewers did not refer to .

• one side ： Because it's a game company , So before the interview, I called to explain my actual situation , And simply put the project experience into A brief explanation was made , Finally, it was suppressed with no game experience .

• HR Noodles ：HR Also because there is no game experience to suppress wages , Although I gave Offer, But this kind of behavior is really unnecessary , It's not a waste of company time , And waste your time .

58 Same city

Interview experience ****

The interview is 58 In the same city 58 Car learning department , Four rounds of interviews ,3 Wheel technology , Round HR Noodles They should be cross interviews , Therefore, the technical aspects are relatively comprehensive , It was a good experience , The communication went well , Especially on three sides , Way of thinking , And the investigation questions are very professional . HR Noodles are also very professional , Introduce the company , Sector Outlook , And the policies and systems are very thorough , Give it to Offer, The salary is relatively low .

The following are 58 Several topics of special investigation ： 1.thread wait sleep join What's the difference? , Main investigation wait sleep Related differences . 2.mvvp and mvp The difference between , How to implement bidirectional binding in details . 3. Channel bag How to write channel data （app Where is the signature ） This involves V1,V2,V3 Signature difference . 4.rgb565 and rgb888 What's the difference? , It mainly focuses on data storage bits . 5. Customize view, Implement a custom View, And it supports pressing to enlarge , Release zoom out animation .

Bang Bang auto service

Interview experience **

• I don't know how many rounds of interviews there are , Anyway, one side is the video side

• The level of the interviewer is relatively poor , There are too many old things to ask , The investigation points are far from enough , Maybe the job orientation is not very high , There are no technical difficulties , It should be customs clearance , But after asking about the intended salary , No follow-up .

• It is suggested that those applying for senior engineer can avoid this company .

Bohui technology

Interview experience ***

• There's nothing to that , Doing military projects , I went in and saw that it was still a ten inch monitor , All that was opened was Eclipse, What the interviewer asked was also quite as imagined , After the interview, I gave it back to Offer, At that time, he declined , Avoid wasting each other's time .

Kika（ Xinmei interworking Technology Co., Ltd ）

Interview experience *****

• This company is a great company , Whatever the interview experience , And the company atmosphere , And the development trend is a very good company .

• There are five rounds of interviews , One side, two sides, video , On three sides CTO Noodles , Project leader of simian , Five sides CEO+HR executive director

• one side ： Relative basis , Asked post get difference , Three handshakes ,jvm The architecture of , Various viewgroup Measure several times respectively ,

• Two sides ： Relatively biased Android Noodles , Main investigation Android Framework source code related , It's also very good .

• On three sides ：CTO Mainly about the project , The related contents of the algorithm are investigated .

• Four sides ： Recruiting Assistant + Together with the project leader , Mainly asked about some project cycles , Release rhythm , Team management , Multi dimensional problems such as problem handling .

• Five sides ：CEO+HR executive director , I mainly asked what I got from the entrepreneurial process , Related to future career development planning .

• This company really praises , The main business is multi language input method , User volume 6 Billion , It may be involved in many aspects in the future , The interview session was also highly praised , Except one side and two sides , The next three sides have a shuttle , Leaders have no airs .

• Finally, after the interview, I returned the interview souvenirs , This is the real attitude of recruiting . Students looking for opportunities can focus on this company .

• The next day I sent Offer, The money is in place , However, I didn't go there for comprehensive reasons , I am very sorry. .

SHAREit（ Eggplant quick pass ）

Interview experience *****

• This company is a fast-growing company , Interview experience , Good working atmosphere .

• Three rounds of interviews , Two technical rounds , Round HR Noodles

• one side ： Asked a lot about the basics , And the details , The questions are all in the top category , The only difference is that the production consumer model is written on site , The interviewer is quite satisfied , Go directly to both sides .

• Two sides ： technology Leader, Asked Glide storage , every last Activity Whether the cached pictures are cached separately , The algorithm is concerned with traversing the binary tree by layer , And output the last node of each layer , And it did 4 -5 Change , How each change is implemented .

• In the face of problems , The interviewer will guide you to think , To solve the , The solution will eventually be . This behavior is highly praised .

• Finally, I gave Offer, But because Ali also gave Offer, So I gave up .

Meituan optimization （ The size of the week , And every night 9 After work ）

Interview experience *****

• Three rounds of interviews , It's all video .

• one side ： Basic interview , The interviewer is simple and honest , The basic part will not be repeated , The special investigation includes ： Merge two ordered linked lists . Remove extra spaces from the string , And the first character of the technical word is capitalized .

• Two sides ： Main investigation items , Solution , Communication is smooth .

• HR： I didn't expect this process to be slow , Maybe they have more candidates , Finally, I gave Offer grading L7, Finally, it is because he chose Ali and gave up .

Bytes to beat （ The size of the week ）

Interview experience *****

• Bytes to beat , I was turned upside down 2 Time , The interviewer is really awesome .

• My first investment was in the Tiktok department , After a while , On both sides , The interview comment is The foundation is relatively solid , However, the project architecture is slightly deficient , So hang it on both sides .

• Being disappointed , Byte of understanding chedi called again , That resume has been fished up again , I went to meet the car emperor again , Hang up again .

• It's really awesome to know the car emperor , For example, I recorded some problems :

1. If you want to unify the thread pool of the project , Including the thread pool of the three party import package , How to deal with .（ The final solution can be achieved through bytecode modification ）
2. If you want to monitor a thread for more than 300 How to operate a millisecond task .（ Reflective acquisition Handler Grab each Message The execution time of ）
3. If an uncaught exception occurs in the project , How pre operation can prevent Crash.
4. If you design a App Startup framework for , What issues need to be considered , How to handle synchronous and asynchronous load task scheduling .
5. glide Loading principle , How to sense loading and pausing .
6. okhttp Loading principle , How to control synchronous and asynchronous tasks .
7. Talk about the difficulties of a project , How to solve this problem .
8. What design patterns have you used .
9. mvp mvvm In what scenarios .
10. One int How to judge the array is the subsequent traversal of the search binary tree .

millet

Interview experience ***

• Xiaomi's interview experience is not very good , In limine HR Communication is the way to interview Xiaomi IOT department , It took about a week from resume submission to interview .

• one side ： It was a good experience , The interviewer is very modest , The problem is also very qualitative , It's probably going on 1 Hours 20 minute , The interviewer was quite satisfied with me .

• Two sides ： More than a week passed between the two sides , This efficiency is really a bit poor , The key is that the two sides are from Xiaomi TV Department , Just like before IOT It's not relevant .

• On three sides ： It's also Xiaomi TV , Talked about a lot of project related content .

• In fact, I am an old rice noodle , From rice 1 All the way to meters 10, Along the way, I have feelings for Xiaomi , But I don't understand why the interview link is like this . Hope to improve a lot , The interview physical examination is a little poor .

Homework help （ Every night 9 Work after o'clock ）

Interview experience ***

• This company is recommended by colleagues , So the interview process is relatively rapid , Push in the first day , Interview the next day , The interview is divided into three rounds .

• one side : Face to face with colleagues , The range of questions is quite wide , Interviewers are also good at communicating , It's a pleasure .

• Two sides :leader Noodles , This leader A former colleague of my colleague , Before 360 Browser kernel , I don't know why Android 了 , The character is relatively boring , Poor communication and feedback , Low communication efficiency .

  To ease the embarrassment of communication , I try to map the answers to life scenes , And he killed me , say ： Technology doesn't have to be exemplified .... Oh my god ...

A little consultation （ Have a culture of not working overtime ）

Interview experience *****

• This company is also pushed by colleagues , Baidu's companies , There are four sides , Three wheel technology , Round HR

• This company has a great interview experience , It's very efficient , All interviews were completed by video , Three rounds of technical work were completed in one day .

• A typical question is asked from three sides , If you have enough people , Enough money , Enough resources , Let you learn oil painting , What should you do ？

Baidu

Interview experience ***

• It is said that this company is also an internal push , But I don't know who pushed it , There are four sides

• one side ： Video face , The interviewer was very nice, More modest .

• Two sides ： What is agreed in advance is 2 PM , And the email was sent 3 spot , Later, the communication was changed back to 2 spot , As a result, I waited for more than half an hour when I arrived , That's ok . The interviewer should not wake up when he comes down , So the interview is emotional .

  After answering the questions, the interviewer habitually asks you Do you think you are right ？ I'm not sure. I usually like to ask the question Is there a better solution , The interviewer really didn't give a plan , So there's nothing to talk about .

• Baidu's interview experience is really poor , Maybe I was unlucky and met a bad person , But the impression of an interviewer will hang on Baidu company , EH ... It's hard ..

Alibaba

Interview experience *****

• Alibaba , I interviewed Ali's mother department , It's Ali's profitable department , altogether 5 Round interview .

• one side ： Pure algorithm , About an hour and a half ,3 Algorithm questions , Each line of code is reviewed and interpreted , The interviewer is my current colleague , I have mocked him for the last two days , And advised him to be kind in the future .

• Two sides ：Android relevant , The interviewer has a wide range of experience , Talked a lot , Finally, the interviewer said , It's almost an hour and a half since today , Let's continue talking when you join the company .

• On three sides ：leader Noodles , This leader It's not blowing , Tete can cut it , From living to working , To technology , To develop , The whole thing was pulled over , We worked for another hour and a half .

• Four sides ：P9 Big Boss Noodles , This mainly talked about some development planning related issues , We talked for about half an hour .

• Five sides ：HR Noodles , Probably chatting. 1 Hour or so , I mainly asked about the ways of dealing with people in the company before , There is also some basic information , Introduced Alibaba's policies and systems , Benefits, etc .

• Ali's Leader Really very sincere , Because of Ali Offer The approval process is quite long , So he called me halfway 7-8 A phone call , Talk a lot every time , Let me rest assured. , So in the end I decided to return everything else Offer, Join Alibaba family .

Okay , That's all for this article , The answers to all the above questions are sorted into PDF 了

I believe if you master all the knowledge and skills above , And can be used flexibly , a monthly salary 20k The above is not a problem ,

Finally, I also prepared for you 40G Software test resources , Contains all of the above , You can see below gzh