Can't interview JVM? Ali P8 summarized 25 JVM interview analysis (basic + advanced + actual combat)

JVM is a big company that cares more and more. I won’t talk about specific projects, but now he must ask JVM for new recruits, regardless of whether they are familiar with JVM on their resume. Just look at one of Xiaobai’s chats and you can feel it!

 

As a Java practitioner, when looking for a job, you will definitely be asked about JVM-related knowledge. The mastery of JVM knowledge is an important criterion for candidates' technical depth in the eyes of many interviewers. This article will focus on common JVM topics during the interview process. The interview questions are divided into three categories: basic questions, advanced questions, and practical questions. And give a standard answer, for everyone to learn reference.

JVM basic high frequency problem

1. What is the relationship between JDK, JRE, and JVM?
2. JVM memory model and partition situation and role
3. What is the process of creating JVM objects?
4. How many types of garbage collection algorithms are there? What are their corresponding advantages and disadvantages?
5. What is the loading process of the class? Briefly describe each step
6. What are the predefined class loaders for JVM? What is the role of each?
7. What is the parental delegation model? what's the effect?
8. What are the garbage collectors in JVM? What are their characteristics?
9. What is a class file? What are the main information structures of the Class file?
10. What is the concept of "object is dead"?

 

JVM advanced high frequency problem

1. What will cause OOM in the JVM data runtime area?
2. Except for the data operation area, other areas may cause OOM.
3. How does the Java language achieve cross-platform?
4. Introduce in detail the allocation process of objects in the zoned memory area?
5. Comparison of G1 and CMS garbage collectors
6. What are the JVM parameters commonly used online?
7. When did the subject enter the old age?
8. What is memory overflow, memory leak? What is the difference between them?
9. What are the behaviors that cause class loading operations?
10. Introduce the common tools provided by JVM
11. What is the difference between Full GC, Major GC and Minor GC?
12. When will Full GC be triggered?
13. Under what circumstances will stack overflow
14. Talk about strong references, soft references, weak references, phantom references and their relationship with gc
15. What is the proportional distribution of Eden and Survivor? why?

 

JVM combat problems

1. CPU resource usage is too high
2. OOM troubleshooting

to sum up

Note: In order not to affect reading, I have sorted the analysis into pdf and shared it for free. Friends in need "add my vx assistant to receive it for free"

"Being a programmer, circle and learning are the most important." Because having a circle allows you to avoid detours, expand your network, expand your ideas, and learn from others' experiences and learning methods! At the same time, share the compiled JVM and performance optimization study notes document and JVM study video here for free!

JVM and performance optimization study notes pdf

The content is divided into 5 modules:

1. JVM memory area division
2. JVM execution subsystem
3. Garbage collector and memory allocation strategy
4. Write efficient and elegant Java programs
5. Performance optimization

 

JVM interview question analysis video

 

Java back-end interview special documents

 

Video explanation of high-frequency questions in Java back-end interview