Introduction
There are currently two major problems with interview questions on the market: First, the questions are too old and have not been updated for a long time, and they are still in the state before 2010; second, the JDK updates and releases have been fast in recent years, and the usage of Java is also A lot has changed, and many new frameworks have been added to the Java technology stack, such as Spring Boot and Spring Cloud, but there are very few similar interview questions.
So I compiled a comprehensive PDF sidebook, this sidebook has the following advantages:
- Pisha picks gold to extract the most classic interview questions in each Java module;
- The answer is accurate, and I have carefully proofread each question;
- Close to the most realistic corporate interview, with practical and effective questions;
JVM and tuning
- Java class loading process?
- Describe the principle mechanism of JVM loading Class files?
- Java memory allocation.
- What is GC? Why is GC?
- Briefly describe the Java garbage collection mechanism
- How to judge whether an object is alive? (Or how to determine the GC object)
- The advantages and principles of garbage collection. And consider 2 recycling mechanisms
- What is the basic principle of the garbage collector? Can the garbage collector reclaim memory immediately? Is there any way to proactively notify the virtual machine for garbage collection?
- Will there be a memory leak in Java, please describe briefly
- Deep copy and shallow copy.
- What will System.gc() and Runtime.gc() do?
- When is the finalize() method called? What is the purpose of finalization?
- If the object's reference is set to null, will the garbage collector immediately release the memory occupied by the object?
- What is distributed garbage collection (DGC)? How does it work?
- What is the difference between a serial collector and a throughput collector?
- In Java, when can an object be garbage collected?
- Briefly describe the Java memory allocation and recovery strategy, Minor GC and Major GC.
- Will garbage collection occur in the permanent generation of the JVM?
- What are the methods of garbage collection in Java?
- What are class loaders and what are the class loaders?
- The class loader parent delegation model mechanism?
At the end of the article, get the way to receive the face
spring interview topics
- 1. What is the Spring framework? What are the main modules of the Spring framework?
- 2. What are the benefits of using the Spring framework?
- 3. What is Inversion of Control (IOC)? What is dependency injection?
- 4. Please explain the IoC in the Spring framework?
- 5. What is the difference between BeanFactory and ApplicationContext?
- 6. How many configuration methods does Spring have?
- 7. How to configure Spring based on XML configuration?
- 8. How to configure Spring based on Java configuration?
- 9. How to configure Spring with annotations?
- 10. Please explain the life cycle of Spring Bean?
- 11. What is the difference between the scope of Spring Bean?
- 12. What is Spring inner beans?
- 13. Are singleton beans in the Spring framework thread-safe?
- 14. Please give an example of how to inject a Java Collection in Spring?
- 15. How to inject a Java.util.Properties into Spring Bean?
- 16. Please explain the automatic assembly of Spring Bean?
- 17. Please explain the difference in automatic assembly mode?
- 18. How to turn on automatic assembly based on annotations?
- 19. Please give an example to explain the @Required annotation?
- 20. Please give an example to explain the @Autowired annotation?
- 21. Please give an example to illustrate the @Qualifier annotation?
- 22. What is the difference between construction method injection and set value injection?
- 23. What are the different types of events in the Spring framework?
- 24. What is the difference between FileSystemResource and ClassPathResource?
- 25. What design patterns are used in the Spring framework?
Due to space reasons, I will not show all of them here. I have compiled these questions into pdf files and shared them for free to those in need. At the same time, it took a lot of time to organize them. Friends in need can help three times and then: "Add me Vx Assistant" to get a free way to receive it!
