banner
lMingyul

lMingyul

记录穿过自己的万物
jike
主页 🏡时间轴 🔖工具箱 🧰

Futu Interview Experience - First Round

104
AI Translation
This post is translated from Chinese into English through AI.View Original
AI-generated summary
The interview experience was good, with the interviewer providing guidance throughout. However, the interviewee struggled with outdated knowledge. The interview covered topics such as Java basics, concurrency, JVM, databases, data structures and algorithms, and projects. Some specific questions included the differences between String, StringBuilder, and StringBuffer, the usage and differences between ArrayList and LinkedList, the usage and issues with HashMap in concurrent scenarios, the reasons for using a thread pool instead of creating new threads, the usage and effects of the synchronized keyword, the differences between Sleep() and Wait() methods, knowledge of Java Virtual Machine garbage collection, transaction levels in MySQL and examples, different types of locks in MySQL, understanding of indexes and the efficiency of primary key indexes, an explanation of quicksort and heapsort, and writing recursive methods for binary tree traversal. In terms of projects, the interviewee was asked to explain a project they had worked on, the reasons for using SpringCloud's OpenFeign for third-party service calls, the implementation of a log calling chain in a project, the differences between MySQL and ProgresSQL, and the process of smoothly switching databases without stopping the service. Lastly, the interviewee was asked how to handle a scenario where a user receives a successful response before a background process finishes and the server crashes, causing the loss of recorded logs.

The interview experience was good, the interviewer was guiding all the time, but it's been a long time since I've dealt with boilerplate code 🤣

  • Position: Backend Development
  • Date: 2023-05
  • Interview Duration: 1 hour 24 minutes

Java#

Basics#

  • Difference between String, StringBuilder, and StringBuffer

    • What is the reason for the better performance of StringBuilder?

  • What are the List implementations used in Java development, and can you explain their characteristics?

    • What is the difference between ArrayList and LinkedList?

  • What are the Map implementations used in Java development, and can you explain their characteristics?

    • What problems can occur with HashMap in concurrent scenarios, and what methods can be used to solve them?

Concurrency#

  • In what situations do you need to use a thread pool in daily development?

    • Why use a thread pool instead of creating a new thread directly?

  • Besides using multithreading, what other approaches do you use to solve concurrency problems in programming (such as locks)?

    • Have you used the synchronized keyword in Java, and can you explain how it is generally used?
    • Can synchronized be used to modify methods, and what phenomenon does it cause?

  • Usage and differences between Sleep() and Wait() methods

JVM Virtual Machine#

  • Are you familiar with Java Virtual Machine (JVM) garbage collection?
    • Which GC model is used in your project?

Database#

  • What are the transaction isolation levels in MySQL, and can you give an example for each level?
  • Can you explain MySQL locks, such as gap locks?
  • Are you familiar with indexes?
    • Why is the query efficiency of a primary key index faster than that of a regular index?
    • What is the difference between a unique index and a primary key index?

Data Structures and Algorithms#

  • Introduction to Quick Sort and Heap Sort
  • Write the inorder and preorder traversal of a binary tree using recursion

Project#

  • Explain in detail about the projects you have worked on
  • Why do you use Spring Cloud's OpenFeign to call third-party services in your project?
  • How is the log calling chain implemented in the project, and how does it work in practice?
  • What are the differences between MySQL and PostgreSQL, and why did you switch the database from MySQL to PostgreSQL?
  • How do you achieve a smooth database migration process without stopping the service?
    • How to achieve a smooth database switch without stopping the service?
  • Scenario: Calling an API where Step A is executed sequentially and Step B is executed asynchronously in the background to record the call logs (which takes longer to execute). Now, if Step A is successful and returned to the user, but the service crashes during the execution of Step B and the logs are not recorded, how would you handle it?
Loading...
Ownership of this post data is guaranteed by blockchain and smart contracts to the creator alone.