Java Interview Preparation Notes

Java

1. Java Collections

Study Resources:

1. Java Collections Learning Guide
2. Java NIO Series Tutorials

Common Interview Questions:

1. How does ConcurrentHashMap achieve high concurrency?
2. Which Java collections are thread-safe?
3. How does Hashtable implement synchronization?

2. Java NIO

Study Resources:

1. Java NIO Guide

Common Interview Questions:

1. What problems does NIO solve?
2. Why is NIO more efficient than traditional IO?

3. Spring Framework

Study Resources:

1. 69 Spring Interview Questions and Answers
2. Top 25 Spring Interview Questions

Common Interview Questions:

1. How do Spring IoC and AOP work internally?
2. Are Spring controllers thread-safe?
3. Are Struts actions thread-safe?

4. Design Patterns

Study Resources:

1. Common Design Pattern Interview Questions
2. 20 Design Pattern Interview Questions
3. Design Patterns (Java GitBook)

Common Interview Questions:

1. Which design patterns do you use most often?
2. What is the difference between Proxy and Decorator patterns?

5. JVM

Study Resources:

1. In-Depth Understanding of the Java Virtual Machine

Common Interview Questions:

1. Class loading mechanism and class loaders
2. JVM memory model and memory regions
3. When does GC occur?
4. How do you tune JVM performance?
5. How do you troubleshoot OOM errors?

6. Distributed Systems & High Concurrency

Study Resources:

1. Designing Large-Scale Distributed Websites
2. Java Concurrency in Practice

Common Interview Questions:

1. Distributed system use cases in your projects
2. How to implement distributed locks?
3. How to choose thread pools for different workloads?
4. How is Redis clustering implemented?

7. Databases

Study Resources:

1. MySQL Performance Tuning and Architecture

Common Interview Questions:

1. Database optimization techniques you have used
2. Database isolation levels
3. MySQL index structures

8. Production Issue Troubleshooting

Common Interview Questions:

1. Describe a challenging production issue you solved

9. Other Questions

Common Interview Questions:

1. What is your most successful project?
2. What was the most difficult problem you solved, and how?

Additional Interview Resources

1. Backend Developer Interview Questions (GitHub)
2. Java Interview Notes
3. Alibaba Java Interview Experiences

Summary

This document serves as a high-level checklist for Java interview preparation.

It is recommended to:

• Deep-dive into each topic
• Combine theory with real-world experience
• Practice explaining concepts clearly and concisely

Strong fundamentals and structured thinking are key to interview success.