Is it difficult to jump job ByteDance? With these skills, you can easily pass

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Interview preparation

Both school recruitment and social recruitment can not avoid all kinds of interviews 、 written examination , How to prepare these things is particularly important . After strategizing , Successful in distant ！ Don't fight unprepared battles , I think you can prepare for the interview from the following aspects ：

1. Self introduction. .（ Introduce your project experience and some specialties instead of simply introducing your preferences ）

2. What knowledge points may be involved in your interview 、 Those knowledge points are the key .

3. What questions are often asked in an interview 、 How to answer in the interview .

4. How to write your resume .

“80% Of offer Master in 20% In the hands of ” This sentence is not unreasonable . Strength is a big part of the factors that determine the success of your interview Sub proportion , But if you don't have the mentality or the luck , Still can't get satisfied offer. Let's not talk about luck , Take mentality , Ten million Don't be discouraged or doubt your ability because of the failure of the interview , Summarize the reasons for the failure after the interview , Then you will find that you will become more and more The stronger .

in addition , It is very important for us to make clear that ：

1. Be careful what you write on your resume , This may be where the interviewer asks a lot of questions ;

2. It's very important to show your project experience perfectly .

Android Common interview questions and scope are as follows

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()、interrupted() 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

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

Summary of experience

1. Be careful what you write on your resume , Be very familiar with what's on your resume . Because in general , The interviewer will be based on you The resume of ;

2. It is also very important to have a project that can be put on the table , This is probably where the interviewer will ask a lot of questions , So in the interview Before you do a good review of their own projects ;

3. Talk to the interviewer about basic knowledge such as the use of design patterns 、 Use of source code, etc , It can be combined with specific project scenarios or in normal times How to use ;

4. It is recommended to know the values of the company you want to interview in advance , Judge whether you are suitable for the company .

in addition , I personally think the interview is like a new journey , Failure and victory are common . therefore , Don't be discouraged by the failure of the interview 、 The loss of morale . Don't be complacent about passing the interview , Waiting for you will be a better future , Continue refueling ！

Last

I have summarized the knowledge on the above system knowledge map 【2022 The latest first-line Internet manufacturer Android The real question of the interview 】 Include Java Basics 、Android Basics 、Framework、 performance optimization 、 Four components 、 Hot repair 、 Componentization 、 pluggable 、Jetpack、 Data structure and algorithm 、 Design patterns and so on … And they are all documented ！

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 . Directly click on the card below to add and receive it for free .