BATJ Internet’s monthly salary of 45K Java job interview questions are exposed for the first time. Mastering these offer designations can’t run

Recently, many programmer friends have reported that they have been working for several years. Seeing that their partners have received a salary of 30K+, their salary has not changed for a long time. The big data of Liepin shows that both companies and individuals are taking active actions to respond, looking for talents, looking for paths, and looking for new possibilities and opportunities.

Currently , a monthly salary of Java programming engineers easily over a million, there are a few years of experience working in Java engineers pay 450,000 ~ 600,000 between per month, and more top talent Java technology is the annual salary easily over one million . Your salary is not in place because you got the wrong direction. Java programming is very popular nowadays, and BAT is hiring madly, and demand exceeds supply.

Here is a summary of Java interview questions for everyone. If you master these interview questions, I think you can charge for it with a monthly salary of 30K!

The content includes: Java basics, JVM, multithreading, concurrency, Spring, MyBatis, SpringBoot, MySQL, Redis, SpringCloud, Nginx, MQ, data structures and algorithms, Linux, and finally resume guidance !

If you need to get it, it’s troublesome one-click triple-link + comment, and then add VX (tkzl6666) to get it for free

As a developer, these core knowledges are really not to be missed, so that you can improve your skills in the interview.

Due to space limitations, the following is a rough presentation of the document:

Basics

1. What are the characteristics of the Java language
2. The difference between object-oriented and process-oriented
3. The size of the eight basic data types, and their encapsulation classes
4. What is the difference between String, String StringBuffer and StringBuilder?
5. The difference between HashMap and HashTable
6. Four references to Java, strong and weak
7. Is it possible that two unequal objects have the same hashcode
8. try catch finally, there is return in try, is finally executed?
9. What situations have you encountered in OOM, what situations have you encountered in SOF
10. The difference between Java IO and NIO
11. Talk about the difference between List, Set and Map?

 

JVM articles

1. Briefly describe the memory model of JVM
2. When will FullGC be triggered
3. What is the Java virtual machine? Why is Java called a "platform-independent programming language"?
4. Object allocation rules
5. Describe the principle and mechanism of JVM loading class files?
6. How to judge the object can be recycled?
7. Will garbage collection occur in the permanent generation of the JVM?
8. Garbage collection algorithm
9. What are the tuning commands?
10. When do Minor GC and Full GC happen respectively?
11. Do you know which JVM performance tuning

 

Multithreading & Concurrency

1. There are several ways to implement multithreading in Java
2. What is the difference between notify() and notifyAll()?
3. Why should the wait and notify methods be called in a synchronized block?
4. There are three threads T1, T2, T3, how to ensure sequential execution?
5. What is the function of the yield method in the Thread class?
6. What is the difference between the submit() and execute() methods in the Java thread pool?
7. Talk about how you use the synchronized keyword. Have you used it in your project? There are three main ways to use the synchronized keyword:
8. What is thread safety? Is Vector a thread safe class?
9. What are the commonly used thread pools?
10. Briefly describe your understanding of thread pools

 

Spring

1. Spring's IOC and AOP mechanism?
2. What is the difference between Autowired and Resource keywords in Spring?
3. There are several ways of dependency injection and what are each?
4. Talk about what is Spring
5. Spring MVC process
6. How does SpringMVC set up redirection and forwarding?
7. What are the annotations commonly used in SpringMVC?
8. Spring's AOP understanding:
9. Spring's IOC understanding
10. Explain the life cycle of spring bean
11. Explain the scope of several beans supported by Spring.
12. Spring has several ways to inject beans based on xml:
13. What design patterns are used in the Spring framework?

 

Mybatis articles

1. What is MyBatis
2. Pros and cons of MyBatis
3. What is the difference between #{} and ${}?
4. What should I do when the attribute name in the entity class is different from the field name in the table?
5. How does Mybatis perform paging? What is the principle of the paging plug-in?
6. How does Mybatis encapsulate the sql execution result as a target object and return it? What are the mapping forms?
7. How to perform bulk insert?
8. In the Xml mapping file, besides the common select|insert|updae|delete tags, what other tags are there?
9. How many ways does MyBatis implement one-to-one? How do you do it?
10. Does Mybatis support lazy loading? If so, what is its implementation principle?
11. Mybatis's primary and secondary cache

 

SpringBoot

1. What is the core annotation of Spring Boot? Which annotations are mainly composed of?
2. What are the ways to run Spring Boot?
3. How to understand Starters in Spring Boot?
4. How to run some specific code when Spring Boot starts?
5. Does Spring Boot need a separate container to run?
6. What is the monitor in Spring Boot?
7. How to use Spring Boot to implement exception handling?
8. How do you understand Starters in Spring Boot?
9. What are the commonly used starters for springboot
10. What are the several ways to implement hot deployment in SpringBoot?
11. How to understand the Spring Boot configuration loading sequence?
12. What are the core configuration files of Spring Boot? What is the difference between them?
13. How to integrate Spring Boot and ActiveMQ?

 

MySQL articles

1. What are the three paradigms of the database
2. What are the database engines
3. The difference between InnoDB and MyISAM
4. Database transaction
5. Index problem
6. SQL optimization
7. Briefly talk about the difference between drop, delete and truncate
8. What is a view
9. What are inner joins, left outer joins, and right outer joins?
10. What problems do concurrent transactions bring?
11. After sub-database sub-table, how to deal with id primary key?

 

Redis articles

1. Redis persistence mechanism
2. Cache avalanche, cache penetration, cache warm-up, cache update, cache degradation, etc.
3. What are hot data and cold data
4. What are the differences between Memcache and Redis?
5. Why is single-threaded redis so fast
6. Redis data types and usage scenarios of each data type
7. Redis's expiration strategy and memory elimination mechanism
8. Why Redis is single-threaded
9. Redis common performance problems and solutions?
10. Why is Redis's operation atomic and how to ensure atomicity?
11. Redis transaction

 

SpringCloud

1. What is SpringCloud
2. What is a microservice
3. What are the advantages of SpringCloud
4. What is a service circuit breaker? What is service degradation?
5. Both Eureka and zookeeper can provide service registration and discovery functions. Could you please tell me the difference between the two?
6. What is the difference between SpringBoot and SpringCloud?
7. What is the significance of load balancing?
8. What is Hystrix? How does it achieve fault tolerance?
9. What is a Hystrix circuit breaker? Do we need it?
10. Talk about the implementation principle of RPC

 

Nginx articles

1. Briefly describe what Nginx is, and what advantages and functions does it have?
2. How does Nginx handle an HTTP request?
3. List some features of Nginx
4. Please list the differences between Nginx and Apache
5. In Nginx, how to use an undefined server name to prevent requests from being processed?
6. Please explain what are the Master and Worker processes on the Nginx server?
7. Please explain forward proxy and reverse proxy in proxy
8. Explain the purpose of Nginx

 

MQ articles

1. Why use MQ
2. MQ advantages and disadvantages
3. What is the difference between Kafka, ActiveMQ, RabbitMQ, RocketMQ?
4. How to ensure high availability?
5. How to ensure reliable transmission of messages? What if the message is lost
6. How to ensure the order of messages
7. How to solve the delay and expiration of the message queue? What should I do when the message queue is full? There are millions of news backlogged for several hours, talk about how to solve it?
8. Ideas for designing MQ

 

Data structure and algorithm

1. Commonly used data structures
2. There are {1,2,3,4,5,6,7,8,9} in the data, please randomly shuffle the order and generate a new array (please implement it in code)
3. Write a code to judge whether an integer is a power of 2 (please implement the code, and refuse to call the API method)
4. Assuming that today is Sunday, March 1, 2015, please work out the day of the week after 13 months and 6 days, and how many days are away from now (please use code to implement, decline to call API methods)
5. There are two baskets, A and B. Basket A contains eggs, and basket B contains apples. Please use object-oriented thinking to exchange items in the two baskets (please use code)
6. More algorithm exercises

 

Linux articles

1. What symbol is used to represent the absolute path? What is the meaning of the current directory and the upper directory? What is the main directory? What command is used to switch directories?
2. How to view the current process? How to perform exit? How to check the current path?
3. See what commands are available in the file
4. List a few commonly used Linux commands
5. How do you check the logs?

 

Resume

1. Why is the resume important?
2. Let’s start with the interview
3. Let’s start with the interview
4. Some things you must know
5. Two rules that must be understood
6. How to write project experience
7. How to write professional skills
8. Typographic considerations
9. Some other small tips

 

If you need to get it, it’s troublesome one-click triple-link + comment, and then add VX (tkzl6666) to get it for free