What are some common Java performance optimization interview questions?

What are some common Java performance optimization interview questions?

Some common questions include: 1. What is garbage collection and how does it affect performance? 2. How can you optimize memory usage in Java? 3. What are the differences between StringBuilder and StringBuffer?

Can you explain garbage collection and its impact on performance?

Garbage collection is the process of automatically reclaiming memory by removing objects that are no longer in use. It can impact performance by introducing pauses during the collection process, which can affect application responsiveness.

What strategies can I use to optimize memory usage?

You can optimize memory usage by using primitive types instead of wrapper classes, utilizing efficient data structures, and minimizing object creation.

What is the difference between StringBuilder and StringBuffer?

StringBuilder is not synchronized and is faster for single-threaded scenarios, while StringBuffer is synchronized and thread-safe, making it suitable for multi-threaded environments.