Introduction
The peak interview period is coming soon, so please prepare in advance! !
This interview question covers most of the Java technology knowledge, enough for you to deal with more than 90% of the interviews on the market. I don't know if you will make a review summary after the interview and think about the interviewer's ideas. In short, I have also summed it up for everyone, so that you can understand the interviewer’s ideas more clearly and face the interviewer’s questions more calmly.
Forewarned is forearmed, without prejudging the waste. Still the old saying: God pays off! I believe that every step of your hard work will reap unexpected rewards.
What's included
The content shared below is basically the real interview questions from Dachang, as well as some real high-quality interview questions. At the same time, it also includes the high-frequency interview questions from last year. The content is very complete. It is specially shared for free to you who want to change jobs and raise your salary. You have a hand.
How to get it: After three consecutive sessions, you can get it for free by sending a private message to the password [Interview] or just check below!
Java basics
1. What are the several data types in JAVA and how many bytes each occupy.
2. Can the String class be inherited and why?
3. The difference between String, StringBuffer and StringBuilder.
4. What is the difference between ArrayList and LinkedList.
5. Talk about the instantiation order of classes, such as parent class static data, constructor, field, subclass static data, constructor, field. When new, their execution order.
6, which used the Map class, what's the difference, HashMap when thread-safe for you, what Map of concurrent use, what are their internal principles, such as the storage method, hashcode, expansion, default capacity.
7、.......
JVM articles
1. Under what circumstances will stack memory overflow occur?
2. JVM memory structure, the ratio of Eden and Survivor.
3. Why should JVM memory be divided into new generation, old generation and persistent generation. Why are there Eden and Survivor in the new generation?
4. What is a complete GC process in JVM, how to promote the object to the old age, and talk about the main JVM parameters you know.
5. Which types of garbage collectors do you know, their advantages and disadvantages, focus on cms and G1, including principles, processes, advantages and disadvantages.
6. The realization principle of garbage collection algorithm.
7、.......
MySQL articles
1. What are the database isolation levels, what are their meanings, and what is the default isolation level of MySQL?
2. What is phantom reading?
3. What storage engines does MySQL have, and their advantages and disadvantages
4. How to safely modify the same row of data under high concurrency
5. What are optimistic locks and pessimistic locks? What are the two standard row-level locks of InnoDB, and explain their meaning
6. What are the general steps of SQL optimization, how to look at the execution plan, and how to understand the meaning of each field
7、.......
Redis articles
1. Advantages of Redis
2. What are the data structures of Redis
3. What to pay attention to when using Redis
4. The transactional nature of Redis
5. What are the current Redis cluster cluster methods, their advantages and disadvantages, and scenarios
6. The principle of Memcache, which data is suitable for storing in the cache
7、......
Spring
1. Talk about the loading process of Spring
2. The realization principle of Spring AOP
3. Talk about the propagation properties of Spring transactions
4. How does Spring manage transactions and how to configure transactions
5. Tell me about your understanding of Spring, the principle of non-singleton injection? Its life cycle? The principle of cyclic injection, the realization principle of aop, talk about several terms in aop, how do they work with each other?
6. DispatcherServlet workflow in Spring MVC
7、......
Operating system
1. The difference between process and thread
2. Several ways of process synchronization
3. The way of synchronization between threads
4. What is a buffer overflow. What is the harm and the reason
5. What kinds of states are there in the process?
6. What is the difference between paging and segmentation
7、......
Multithreading
1. Several implementations of multithreading, what is thread safety
2. The principle and function of volatile, can it replace locks?
3. The difference between sleep and wait
4. The meaning of sleep(0)
5. The difference between Lock and Synchronized
6. What is the principle of synchronized and where is it generally used (such as the difference between loading static methods and non-static methods)
7、.....
Data structure and algorithm
In recent years, due to the push of byte beating and Huawei, data structure and algorithm interviews have gradually become a standard for Internet giants to screen talents. The main scope of major inspections is linked list, stack and queue, hash table, heap, String and KMP, BM algorithm, tree, graph theory, seven search algorithms, ten sorting algorithms, greedy algorithm, dynamic programming algorithm, divide and conquer algorithm, backtracking algorithm, branch and bound algorithm.
Many classic algorithm questions can be found on LeetCode, so we will skip the interview questions for the time being. We will mainly learn about thinking. This is the fundamental countermeasure to understand the algorithm and respond to the interview.
There are more Java interview questions that have been compiled into a pdf. The following figure shows the interview techniques involved. Due to space limitations, there are other things to share below, so I won’t introduce them one by one. If you need it, you can get it by private message [interview] after three consecutive sessions!
Interviewer's brain circuit
This article involves advanced technologies such as message queues, Redis caches, sub-databases and tables, high availability, distributed, and Spring Cloud microservice architecture. Due to space limitations, only some technical points are shared here, and the full version can be obtained by private message [Interview]!
message queue:
1. If you are asked to write a message queue, how to design the architecture? Tell me about your thoughts.
2. How to ensure the high availability of the message queue?
Distributed Systems:
What are Dubbo load balancing strategies and cluster fault tolerance strategies? What about dynamic proxy strategies?
Spring Cloud microservices:
Dachang Adventure
At last
The latest Java interview package covers the mainstream technology points of the first-line Internet companies. For more Java interview materials and Java core dry goods knowledge, please private message [Interview] or scan below to get!
Having mastered these knowledge points, you can get a lot of eye-catching among candidates during the interview, crit 9999 points. Opportunities are reserved for those who are prepared. Only with sufficient preparation can you stand out among the candidates.
