Preface
This year’s interview is much more difficult than in previous years. Various Internet companies have more and more requirements for Java positions. The main reason is that junior positions have become saturated, but senior positions are relatively lacking. Such talents There are few, so as Java developers, we should think about how to develop into advanced talents instead of transferring to other languages. We must know how to be at the top of the pyramid instead of avoiding those who have been at the grassroots level.
This article mainly records an experience of my interview with Bytedance and my personal preparation before the interview. Of course, I was able to get the offer of Bytedance. It also benefited from the "Alibaba Customs Interview Handbook", this manual. I read page 349 for 28 days and gained a lot.
The main body of this article is divided into two parts. The first half mainly describes the contents of the Alibaba Interview Clearance Manual, and the second half records a complete experience of my entire interview, including interview questions and interview experience.
This Alibaba Interview Clearance Manual is divided into two chapters. The first one is mainly "Interview Experience Skills" and the second one is "Interview Techniques Overcome". I will elaborate on these two parts one by one below.
The "Alibaba Interview Clearance Manual" in the article and my study notes + e-books + real interview questions can be shared for free, and friends who need it can click the portal ! !
1. (Part I) Interview Experience Skills
1. Interviewer's motto
This chapter mainly contains some suggestions and mottos of interviewers from current major Internet companies for interviewers, including Ali, Bytedance, Tencent, Meituan and other companies have something to say, this part of the content is a bit more conceptual , But it is true that for the interviewer, the benefit is a lot after reading it.
The recommended points are as follows:
- There is no way, but the technique can be sought; if there is no way, it ends with the technique
- Refinement but not perfection
- Keep your feet on the ground and develop multiple skills
- Keep an empty mind
- The workplace is a stage for the capable
- Learn to "Talk on Paper"
2. Interview experience exchange
This article mainly includes an interview experience shared by an in-service engineer of a first-line Internet company. "The lesson from the past, the teacher of the future" is vividly reflected in this chapter. This chapter provides a unique analysis of the current programmer interviews, preparations related to written examinations, time planning, book reading, interview skills, offer selection and other aspects. For those who are about to interview or are preparing for an interview, some are very good. Good guidance.
3. Corporate Interview Strategy
This part of the content is a strong one-to-one analysis of the current Internet companies, network equipment suppliers (telecommunications operators, banks, etc.), start-up companies and other IT companies, including the difference in processes and interviews between them. Different content, focus, and precautions, etc., have detailed analysis, which can be very intuitive to understand the requirements of the enterprise.
Due to limited space, the next interview technique can only show part of the interview questions, the detailed and complete version and the answer analysis, click the portal if necessary ! !
2. (Part 2) Interview Technical Conquer
1. Basic knowledge of Java
- What are the advantages of the Java language?
- What are the similarities and differences between Java and C/C+++?
- Why is the method public static void main (String[]args) needed?
- How to output "Hello World" before the main() method is executed?
- What is the order of initialization of Java programs?
- What are the scopes in Java?
- Can multiple classes be defined in one Java file?
- What is a constructor?
- Why do some interfaces in Java have no methods?
- What does the clone method in Java do?
- What is the reflection mechanism?
- What does the package do?
- How to achieve a function similar to the function pointer in C language?
- Object-oriented technology?
- What is the difference between object-oriented and process-oriented?
- What are the characteristics of object-oriented?
- What are the advantages of object-oriented development?
- What is inheritance?
- What is the difference between composition and inheritance?
- What is the realization mechanism of polymorphism?
- What is the difference between overloading and overwriting?
- What are the similarities and differences between abstract class and interface?
- What are the internal classes?
- How to get the class name of the parent class?
- What is the difference between this and super?
- What are the rules for variable naming?
- What is the difference between break. continue and return?
- What is the difference between final, finally and finalize?
- What does assert do?
- What are the functions of the static keyword?
- What are the precautions when using switch?
- What is the role of volatile?
- What does instanceof do?
- What does strictfp do?
- Basic types and operations?
- What basic data types does Java provide?
- What is an immutable class?
- What is the difference between passing by value and passing by reference?
- ......
- What is the difference between Collection and Collections?
- What is a thread? What is the difference between it and the process? Why use multithreading?
- What is the difference between synchronous and asynchronous?
- How to achieve Java multithreading?
- What is the difference between the run() method and the start() method?
- What are the implementation methods of multi-thread synchronization?
- What is the difference between sleep() method and wait() method?
- What are the ways to terminate threads?
- What are the similarities and differences between synchronized and Lock?
- What is a daemon thread?
- What is the role of join () method?
- How to access the database through JDBC?
- What method does JDBC use to process transactions?
- What is the role of Class.forName?
- What is the difference between Statement, PreparedStatement and CallableStatement?
- What is the difference between the getString () method and the getObject () method?
- What issues should be paid attention to when using JDBC?
- What is JDO?
- What is the difference between JDBC and Hibernate?
- ......
2.Java Web
- Servlet与JSP？
- What is the workflow of page request?
- What is the difference between GET and POST methods in HTTP?
- What is Servlet?
- How to choose between doPost() method and doGet() method?
- What is the life cycle of a servlet?
- What are the advantages of JSP?
- What are the similarities and differences between JSP and Servlet?
- How to use JSP and Servlet to implement the MVC model?
- What is the difference between forward and redirect in Servlet?
- What are the built-in objects of JSP?
- What are the main methods of the request object? What are the actions of JSP?
- What is the difference between include directive and include action in JSP?
- What are the session tracking technologies?
- How to specify the encoding of strings in web development?
- What is Ajax?
- What is the difference between cookie and session?
- What is J2EE?
- What are the commonly used terms in J2EE?
- What are the different categories of EJB?
- What are the similarities and differences between EJB and JavaBean?
- What is the life cycle of EJB? ?
- What are the roles of EJB?
- What is the development process of EJB?
- .......
- What is the working mechanism of the database connection pool?
- What are the tuning methods for J2EE development?
- What is the Struts framework?
- What is the workflow of the Struts framework in response to customer requests?
- There are several types of data verification in the Struts framework?
- What is the form validation process of Form Bean?
- In the Struts configuration file, what attributes and sub-elements does the <action> element contain?
- What are the functions of ActionForm Bean?
- What are the execution steps of ActionForm?
- What is the difference between forward and global-forward?
- How does Struts realize internationalization?
- What are the differences between Struts 1 and Struts 2?
- What is loC?
- What is AOP?
- What is the Spring framework?
- What is Hibernate?
- What is Hibernate's second-level cache?
- Hibernate session update () and saveOrUpdate (). What is the difference between load() and get ()?
- What are the primary key generation strategies of Hibernate?
- How to implement the paging mechanism?
- What is SSH?
3. Database principle
- What are the functions of the SQL language?
- What is the difference between internal connection and external connection?
- What is a transaction?
- What is a stored procedure?
- What is the difference and connection between it and the function?
- What is the difference between the various paradigms?
- What is a trigger?
- What is a cursor?
- What happens if the database log is full?
- What is the difference between union and union all?
- What is a view?
- ......
4. Design patterns
- What is the singleton pattern?
- What is the factory model?
- What is the adapter mode?
- What is the observer mode?
- ......
5. Data structure and algorithm
- How to add and delete singly linked lists?
- How to remove duplicate data from the linked list?
- How to find the kth element from the bottom in a singly linked list?
- How to achieve the reversal of the linked list?
- How to output a singly linked list from end to beginning?
- How to find the middle node of a singly linked list?
- How to detect whether a linked list has a ring?
- How to delete a specified node without knowing the head pointer?
- How to judge whether two linked lists intersect?
- What is the difference between stack and queue?
- How to implement the stack?
- How to find the smallest element in the stack with O(1) time complexity?
- How to implement the queue?
- How to simulate queue operations with two stacks?
- How to sort by selection?
- How to perform insertion sort? How to perform bubble sort?
- How to merge and sort?
- How to perform quick sort?
- How to perform Hill sorting?
- How to do heap sort?
- What are the advantages and disadvantages of various sorting algorithms?
- ......
- How to find the position of the first occurrence of a specified number in the array?
- How to merge two sub-ordered segments of an array?
- How to calculate the intersection of two ordered integer arrays?
- How to judge-whether the values in an array are consecutively adjacent?
- How to find the number of reversed pairs in an array?
- How to solve the minimum triple distance 8.6 string?
- How to reverse the string?
- How to judge whether two strings consist of the same characters?
- How to delete repeated characters in a string?
- How to count how many words are in a line of characters?
- How to print the arrangement of the array as required?
- How to output all combinations of strings?
- The basic concept of binary tree
- How to implement a binary sort tree?
- How to traverse a binary tree hierarchically?
- Knowing the pre-order traversal and the middle-order traversal, how to find the post-order traversal?
- How to find the maximum distance of nodes in a binary tree?
- How to eliminate nested parentheses?
- How to find the maximum and minimum of two numbers without using comparison operations?
- ......
6. Mass data processing
- problem analysis
- basic method
- Classic case analysis
- top K problem
- Duplicate question
- Sorting problem
3. Byte Beating Interview Questions Reduction (Technical Questions)
I will not restore the whole process of the byte beating this time. I will only share the interview questions. The interview questions are mainly technical, and the Hr side is basically the same and I will omit it. You can refer to this year's byte beating meeting. What kind of questions to ask, hot and fresh interview questions, I hope it can bring you some help.
- Where does the Session exist? How to return session_id to a client?
- Redis data structure, what complex data structure does it have?
- The difference between Http and Https, describe the process of encryption and asymmetric encryption in detail?
- The difference between thread and process?
- IO multiplexing
- Is the redis server multi-process or single-process, multi-threaded or single-threaded?
- How is top loadaverage calculated?
- How does hashmap resolve conflicts?
- What is a phantom read for database transactions? How are transactions implemented?
- How to check the server load with linux commands?
- How to check port occupancy?
- How to check if a certain port of the remote server is occupied?
- It can be pinged, but the client cannot connect to the server at that time. What is the reason?
- What parts does the operating system include?
- How to allocate memory?
- What happens during process switching?
- fork function
- Project: How to expand and shrink the distributed capacity?
- Talk about the difference between B tree and B+ tree
- Three handshake, four waves
- Why time-wait?
- java multi-thread synchronization
- Project: How to avoid oversold?
- Redis master-slave synchronization
- Why does the operating system memory need to be paged?
- The B+ tree is full of leaves, what should I do if I want to add a new branch?
- How to sort 5G data and 1G memory?
- The principle of operating system lock
- volatile keyword
- Singleton
- Spring AOP
- The principle of annotation
- OOM situation
- Jvm memory model
- Algorithm part: (1) an array of length n, with elements between 1 and n, find a repeated element, the lower the space complexity, the better; (2) the longest non-repeated substring; (3) find comparison The next number that is larger than the current number, such as 1243, the result is 1324; (4) Given an ascending array and a target value, find the largest number smaller than target (similar to a step of ascending insertion sort); (5) linked list Loop; (6) Take out the smallest element of the stack in O time; (7) Find the value with the smallest absolute value in the ascending array
Byte Beat Interview Question Answers
Four, interview experience
Compared with other big companies, the overall atmosphere of the Bytedance interview is relatively relaxed. Maybe it is because the interviewers are relatively young. In fact, the impression it gives to the outside world is always the same, young and energetic. Therefore, if you make relevant preparations in the early stage, the interviewer will basically not embarrass you too much.
Interview byte beating, there are several points that need to be prepared in advance:
①Review the basics and principles, and read some technical notes. During the interview, this part will definitely be asked, but most of it ignores the basic part and affects the interview result. Therefore, before the interview byte beats, I can be considered as a lot of work in this part, combining the basics and principles. Consolidated, and I also read the blogs and handwritten notes of some technical experts.
② Algorithm. Nowadays, many Internet companies like to ask about algorithms during interviews. ByteDance likes to ask about algorithms. I believe everyone has heard about them. From the interview questions I mentioned above, it can be seen that there are basically more questions about algorithms. As for many friends asking how to prepare the algorithm, it is actually very easy. The quickest and most effective way is to write the questions. I have also prepared three sets of "Algorithm Book" to offer:
Three sets of "algorithms"
Algorithm brushing LeetCode Chinese version (as an example)
to sum up
People are very different. We all have our own goals. I am adrift in first-tier cities and occasionally admire those who live happily and steadily in my hometown, but I deeply know that what I want is better every year. There is progress in a year.
Finally, what I want to say is that no matter what age you are in, what city you are in, what background or education you have, the person you compare to will always be yourself, so next year you will see if there is a gap with you this year. People who are salted fish can only use their best to jump. Wish, you will be better next year!
"Alibaba Interview Clearance Manual + Study Notes + Technical Notes + Algorithm Collection + Interview Question Answers" to receive the password online: just click on the portal ! ! Finally, don't forget to forward + comment, and support my article!