Tencent T2 Daniel explained in person and doubled his job hopping salary

Preface

last year , A potential rule of the workplace has become popular on the Internet ：

Don't scold young people loudly , They will resign immediately , But you can scold those middle-aged people to death , Especially those with cars, houses and dolls .

Truly feel the middle-aged crisis of programmers

In China, , Except from  BAT  Out of the cattle , General managers arrive at  35  year , Director level to  40  year , There will really be fewer opportunities in the future , It's not about whether you can do it , It's someone who doesn't give you a chance to do it , Don't think about what foreigners can do  50、60, You're going to die , I hope the latecomers have made plans , Don't come to the last awkward moment .

Huawei layoffs 34 Programmers over years old , Internet companies are increasingly looking for fresh blood .90 Later is in an awkward stage , There was a senior senior senior in the workplace before , They have a deep foundation , A wide network of people , Experienced , Rely on years of hard work to sit at the top of Management , There is not much room for promotion ; There are young and fresh meat , Now the technology update iteration is fast , New things emerge in endlessly ,90 Post learning ability can't compete with postgraduates , The competitive advantage is not obvious , Only one “ Not more than ” The situation of .

Android piece

• Handler Implementation mechanism , Synchronization barrier ,IdleHandler

• Looper Can I create it in a child thread

• Handler How to realize the timing of sending messages

• HandlerThread Implementation principle of

• Event delivery mechanism , Combined with the specific scene of sliding conflict to solve the problem

• View Drawing process , from Vsync Signal to ViewRootImpl To the end View Of draw

• Apk Packaging process （ Click on  Android Studio  Of  build  What happened after the button  ）

• Apk setup script

• Memory leak ,Handler How to lead to Activity Memory leak , How to do the test , The referenced link to GCRoot

• Fragment Life cycle

• Activity Display the status after switching the status under various startup modes

• Screen reversal Activity The life cycle of

• Dialog Pop up the back of Activity What happens in the life cycle ？

• An application startup process , How to communicate with AMS,PMS Interaction

• EventBus Implementation principle of , How sticky events are implemented ？ Why use EventBus, Where are the advantages ？

• Retrofit The principle of the implementation is combined with the dynamic proxy to ask

• Picasso And Glide The difference between （ Differences in caching ）

• Volley And Okhttp The difference ,Okhttp The realization and the advantages of

• How to realize multi process database and file operation ？

• Android Signature ,V1,V2

• Glide How to realize the life cycle in the project

• Glide How to load a Gif chart

• about Android In the memory use attention point （ Focus on memory leakage and memory optimization ）

• MVP,MVVM,MVC The difference between the two has been applied to the scene

• Android APK Why not in IOS Up operation , How to design it to run ？

• Android Why does system design use virtual machine instead of executing machine code directly ？

• Through the differences between virtual machine operation and direct execution of machine code, what are their respective advantages ？

• Dalvik and ART The difference between

• Native How does the lifecycle inform Web？

• understand Android Medium ANR Do you ？

• understand Android Medium OOM Do you ？

• RecyclerView The principle of cache implementation in

• RecyclerView in ItemDecoration Implementation principle of

• Activity,Window,WindowManager,ViewRootImpl How to look at the relationship between these

• What's the difference between dynamic registration and static registration ？

• Android The way in which processes communicate in ,Binder What are the advantages of ？

• SparyArray and ArrayMap Implementation principle of ？

• Have used Koltin Do you ？

• Have used RxJava and Retrofit Do you ？

• Web And Native The way of communication

• SurfaceView and TextureView The difference between

• Surface Why double buffering ？

• Bitmap The optimization strategy of big picture loading ？

• SharePreference Of commit and apply The difference between

Java relevant

• HashMap and HashTable,ConcurrentHashMap The difference between

• ConcurrentHashMap Of 1.7 and 1.8 Version difference

• LinkedHashMap Realization principle

• ArrayDeque Realization principle

• Java Object What are the ways of ？equals and hashCode When will the method be overridden ？

• Java The lock of pessimism and the lock of optimism , Give an example and explain its implementation ？

• CAS Realization principle

• synchronized and ReentrantLock The difference in the realization of

• synchronized Modification of different methods , Differences in lock objects held

• ThreadLocal Realization principle

• volatile usage

• Let's talk about the understanding of generics

• Generic erase

• When there is no generic erasure

• Let's talk about the understanding of thread safety ,Java Which collection classes are thread safe or not ？

• Java Garbage collection mechanism

• JVM Memory allocation mechanism in

• Java Class loading mechanism

• Usually the application of lock in the project

• Java What types of thread pools provide by default ？ What scenes are suitable for ？

• Java In the thread interrupt()、inte 
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   rrupted() and isInterrupted() What do they mean ？

• Dynamic agent and static agent

Algorithm and data structure

For the client , The major factories will not have too difficult problems , The difficulty is basically 《 The finger of the sword Offer》 and LeetCode Medium level , Basically, you can still write by hand bug free Of , For the implementation of complex , The interviewer will also give you tips or just let you talk about some ideas , Besides Baidu , Everything else needs to be handwritten . Because Baidu doesn't need handwriting , Investigation ideas , So it's a little more difficult .

• There are some points in the two-dimensional coordinate system , Find a line that covers as many points as possible

• A linked list represents a number , Find the sum of two numbers , Returns a linked list

• List reversal

• The lowest depth path of a binary tree

• Find two numbers in an unordered array whose sum is a certain value , Return index value

• The following traversal of binary tree , Non recursive implementation

• The longest non repeating substring in a string

• knapsack problem （ Maximum capacity and maximum value ）

• The difference between dynamic programming and recursion , What problems can be solved by dynamic programming , What's wrong with

• Complexity and sort algorithm , There is no better optimization space

• In the complexity of sorting algorithm nlgn Medium lgn How did you get it

• Heap sort related , The difference between the heap in the heap sort and the heap in the stack

• Two strings , Find the longest substring ？ for example abc1234,123bc（ The complexity of violent methods , Complexity of dynamic programming ）

• What is a complete binary tree ？

For algorithmic problems , We need to find the optimal solution , Handwritten reach Bug free The level of , At the same time, the time complexity can be given for various solutions , At the same time, the calculation process of time complexity is given .

Fundamentals of computer

• TCP Three handshakes , Four waves

• DNS Analytic process

• Http and Https The difference between

• Https The process of establishing a connection

• What is a deadlock ？ How to produce ？ How to eliminate ？

• TCP Implementation of congestion control and flow control ？

• Processing strategy of network request under weak network , Combined with the live broadcast scene

• Understand those design patterns ？

• What are the advantages of factory design pattern ？

• How are design patterns and policy patterns applied in a project ？

• Have used those encryption algorithms ？

• How to understand atomicity and visibility ？

• How to guarantee atomicity ？

• Https Whether the data transmission is symmetric encryption or asymmetric encryption ？

• Complement representation ,int Maximum plus 2 How much is it after

Other handwriting design

• LruCache Realization

• producer , Consumer model

• Design of wechat recording module

• Design a log system

• Design a picture loading framework , How will you achieve it ？

• Handwriting a singleton implementation

• Design an applet container , What points need attention ？

• How to design Web And Native Authentication of communication

HR Face to face Leader Noodles

• HR Noodles

about HR It's basically about talking about past experiences , Take a look at your job intention , I think the business department has decided to hire someone ,HR The probability of hanging people should be very small , Then talk about salary expectations , To put it bluntly, it is around its own KPI Come and deal with you , Keep the price down and make sure you have enough willingness to join . Make complaints about it , Of a company HR Quality is really explosive , Ask me how much money I lost in starting a business ？ Is your girlfriend in Beijing ？（ The special size is ready to keep me ？）

• Leader Noodles

What do you expect to do ？ What do you think you can bring to the company ？ Of course, the interview styles of different companies are quite different , The quality of the companies interviewed above is still very high , Give the interviewer full respect . Unless you think your job content and salary expectations are far from what they can provide , Generally, it can be passed .

Last

To make a long story short ,

Success is reserved for those who are prepared

. No matter what the interview is , Be well prepared , Pay attention to the etiquette and dress of the interview , Just show your enthusiasm and sincerity to the interviewer . Even if I didn't pass the test in the end , We should also sum up our experience , Be prepared for the next interview .

Here I've prepared some interview materials for you , Except for the interview questions , Also summed up the Internet companies Android Most of the questions and answers involved in the programmer interview , And organized into a document , And the advanced learning video of the system to share with you , Hope to help you review before the interview , And find a good job , It also saves time for people to search information on the Internet to learn .

After all, no matter what kind of interviewer you meet , The most important thing to go to an interview is your strength , As long as the strength is strong enough , The technology is strong enough , I'm not afraid that I won't get the interview offer！

Why some people are always better than you , It's because he's good and he's constantly trying to be better , And are you still satisfied with the status quo and secretly happy ！ I hope you can give me a little compliment and pay attention to me , In the future, we will update the technology of dry goods , Thank you for your support ！