preface

As a Java developer, Java architect should be a career goal for everyone.

To become a Java architect, you must first be a senior Java engineer, familiar with various frameworks and understand how they are implemented. JVM virtual machine principles, tuning, understanding the JVM allows you to write better performance code;

What object pool, connection pool, thread pool… Java reflection technology, a necessary technology for writing frameworks, but with serious performance problems, alternative Java bytecode technology; Nio, there’s nothing to say, but it’s worth noting the “direct memory” features, usage scenarios; Java multithreading synchronous asynchronous;

Java various collection object implementation principle, understand these can let you choose the appropriate data structure when solving the problem, efficiently solve the problem, such as the implementation principle of hashMap, many people with more than five years of experience are not clear, and why the expansion of performance problems? If you don’t understand these principles, you can’t write efficient code, and you think you’re doing it right;

In a word, the more basic things are more important. Many people think they can write code with them, but in fact they only know how to call API, far from being able to use them. In the era of rapid development of the Internet, we can only keep up with the progress of The Times and not be eliminated.

basis

  1. The status of a Java thread
  2. The difference between a process and a thread, how do processes communicate with each other, how do threads communicate with each other
  3. What is the data structure of a HashMap? How to implement. And HashTable, ConcurrentHashMap
  4. The difference between cookies and sessions
  5. What’s an index for? How to build an index?
  6. How is ArrayList implemented, the difference between ArrayList and LinkedList? How to expand ArrayList.
  7. Equals method implementation
  8. object-oriented
  9. What is the difference between a thread state, BLOCKED and WAITING
  10. How does the JVM load bytecode files
  11. JVM GC, GC algorithm.
  12. When does a Full GC occur and when does a YONG GC occur?
  13. JVM memory model
  14. Java runtime data area
  15. How transactions are implemented

The framework

  1. Read the source code of what open source framework
  2. Why Redis? What are the advantages and disadvantages of Redis? How does Redis implement capacity expansion?
  3. How and why does Netty use thread pools
  4. Why use Spring, and what are its advantages and disadvantages
  5. Spring’s IOC container initialization process
  6. Spring IOC container implementation principle, why can find beans by byName and ByType
  7. Implementation principles of Spring AOP
  8. How is messaging middleware implemented and what are the technical difficulties

Technical depth

  1. Have you read the JDK source code, read the class implementation principle is what.
  2. The HTTP protocol
  3. TCP protocol
  4. Consistent Hash algorithm
  5. How does the JVM load bytecode files
  6. How does the class loader unload bytecode
  7. The difference between IO and NIO, NIO advantages
  8. Java thread pool implementation principle, keepAliveTime and other parameters function.
  9. Implementation principles of HTTP connection pooling
  10. Implementation principle of database connection pool
  11. The realization principle of database

System architecture

  1. How to build a HIGH availability system
  2. Which design patterns can increase the scalability of the system
  3. Introduces design patterns such as template pattern, command pattern, policy pattern, adapter pattern, bridge pattern, decorator pattern, observer pattern, state pattern, and visitor pattern.
  4. Abstract ability, how to improve research and development efficiency.
  5. What is high cohesion low coupling, please give an example how to achieve it
  6. When do you use interfaces and when do you use messages
  7. If two systems AB are interdependent, how can they be removed
  8. How to write a design document, what is the content
  9. What scenarios should split systems and what scenarios should merge systems
  10. The difference between system and module is used in what scenarios

distributed

  1. Distributed transaction, two-phase commit.
  2. How to implement distributed locking
  3. How to implement distributed sessions
  4. How can message consistency be guaranteed
  5. Load balancing
  6. Forward proxy (client-side proxy) and reverse proxy (server-side proxy)
  7. CDN implementation principle
  8. How to improve system QPS and throughput

Actual combat ability

  1. Have you dealt with online problems? How to deal with memory leaks, high CPU utilization, and unresponsive applications.
  2. Have you encountered any technical problems during development? How to solve it
  3. How to design this function if there are billions of whitelists, which need high concurrent query during the day and update once at night?
  4. How does Sina Weibo reach subscribers
  5. How Google returns search results to users in less than a second.
  6. 12306 website booking system how to achieve, how to ensure that tickets will not be oversold.
  7. How to implement a seckill system to ensure that only a few users can buy an item.
The above is purely common technology, there are a lot of their own slowly to explore it; Because there is so much to know, being a qualified architect requires a strong self-learning ability. No one is going to teach you everything by hand.

To become an architect, you need to know more than a bunch of techniques. These are the foundation and tools for solving problems. How can you propose solutions if you don’t know them? This is essential to being an architect.

The above interview questions have been summarized in a nearly 500 page PDF document, welcome to my public kind hao: programmer catch wind, get these organized information!

I hope it can help you review before the interview and find a good job, but also save you time to study in the Internet search materials.

The last

Welcome everyone to exchange, like the article remember to pay attention to my like yo, thank you for your support!