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Ali Java programmers who have worked for 5 years share their experience in the field of work, share their experience and interview notes and interview notes

First year of work , Often everything is full of freshness , Learn everything , An exciting year ;WEB Industry knowledge update is particularly fast , A new version of the framework today , Tomorrow is another new framework , Sometimes we learn new things according to the needs of the project ; all , A lot of times I feel , There are so many things I have used ! But there are not many in-depth studies . interview , It's the first problem to face after job hopping ; And different companies interview with different emphasis ; But there is one thing in common :Java The foundation is a must .

First year of work , Often everything is full of freshness , Learn everything , An exciting year ;WEB Industry knowledge update is particularly fast , A new version of the framework today , Tomorrow is another new framework , Sometimes we learn new things according to the needs of the project ; all , A lot of times I feel , There are so many things I have used ! But there are not many in-depth studies . interview , It's the first problem to face after job hopping ; And different companies interview with different emphasis ; But there is one thing in common :Java The foundation is a must .

First year of work , May ask you String Understanding of object creation , What is the common framework and so on ;
Third year of work , Just ask you Java What is the memory allocation mechanism , How classes are loaded and so on ;
The fifth year of work , Ask what design patterns you often use , What role do you play in your work , How to complete a module independently and so on ;
It can be seen that —— This is a typical programmer's growth process :

newest 2020 Organize some interview questions collected ( It's all documented ), There are a lot of dry goods , contain mysql,netty,spring, Threads ,spring cloud Wait for a detailed explanation , There's also a detailed learning plan , Interview questions, etc , I feel very clear about the interview : All you need to do is : Click here to get !!!  Code : Blog Garden  Insert picture description here

Reasonable career planning

What is career planning —- It's your short-term or long-term career plan ! Don't talk about the big reason , Let's be simple . Ask you a few questions first :

a. You've been working for years , Would you like to be a simple programmer all the time just like a new novice ?
b. You're willing to write code all the time , And don't care about anything else ?
c. The early needs of a project , Design , Post deployment maintenance , Leaders find you , You say we can't make it , Would you? ?
Programmers are not machines that knock code . There were so many things I didn't understand in the first year , You can follow the boss's orders , Knock on the code , Look at the database , Test your own and others' code ; But the next year , Are you still like this ? impossible , A year's experience is ready for you , It's time to learn how to do needs analysis , How to design database , How to write all kinds of documents , How to write better code ? This is the requirement of senior programmers !

What is a senior programmer ?

Have the ability of analysis and design , Be able to tackle technical problems , And programmers with a deep background in an industry !

all , After a project is approved , You should actively participate in the preliminary design , Think and analyze problems with old comrades , Learning experience !OK, You are growing up now !

Don't think programmers write code !!!

and , Through the development of a project , You need to be able to roughly count the development time of a function ; For example, a module has 20 A little function point , You developed 80 Hours , Every little function point is average 2 Hours —— Then we can evaluate the workload in the early stage . Of course, everyone's efficiency and work quality are different , Differ from man to man , But the approximate workload can be calculated , Used to count the work cycle of a project ;

Today, I'd like to share with you what I've sorted out in this job hopping Java Interview outline , Most of them are interview questions in the interview process , We can check and fill in the missing , Yes, of course , It's impossible to cover all the ways listed here .

well , Now enter the main body of the interview .

Java Basics

1、List and Set The difference between
2、HashSet How do you make sure you don't repeat
3、HashMap Is it thread safe , Why not thread safe ( It is best to draw a picture to show that multithreaded environments are not safe )?
4、HashMap Expansion process
5、HashMap 1.7 And 1.8 Of difference , explain 1.8 What optimizations have been made , How to optimize ?
6、final finally finalize
7、 Strong citation 、 Soft citation 、 Weak reference 、 Virtual reference
8、Java Reflection
9、Arrays.sort Realization principle and Collection Realization principle
10、LinkedHashMap Application
11、cloneable Interface implementation principle
12、 Exception classification and handling mechanism
13、wait and sleep The difference between
14、 How arrays are allocated in memory

Java Concurrent

1、synchronized Implementation principle and lock optimization ?
2、volatile Implementation principle of ?
3、Java The signal lamp ?
4、synchronized The difference between static methods and normal methods ?
5、 How do all threads wait for an event to happen before they execute ?
6、CAS?CAS What are the drawbacks , How to solve ?
7、synchronized and lock What's the difference? ?
8、Hashtable How was it locked ?
9、HashMap Concurrent problems of ?
10、ConcurrenHashMap Introduce ?1.8 Why should we use red and black trees in China ?
11、AQS
12、 How do I detect deadlocks ? How to prevent deadlock ?
13、Java Memory model ?
14、 How do you ensure multithreading i++ Results the correct ?
15、 The type of thread pool , Distinguish and use scenarios ?
16、 The implementation principle of thread pool and thread scheduling process are analyzed ?
17、 How to tune the thread pool , How to confirm the maximum number .........

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