Java background test for a small company

The master knows in the programming this line does not have too much talent, the qualification is mediocre, but oneself makes the choice, must strive for it.

A few days ago to push Ali, was mistaken department, heard, so he cast a small company, the same day received the interview notice, go to directly is 30 minutes to do the title, a total of 16 questions, but also simple, but there are shortcomings, the master only got the title of the first 12 questions, so it is first to write down, for review.

1. Reflection, the difference between Class.forName and Classloader.loadclass.

2. Describe how to locate and handle a Java memory leak.

3. Run-time exceptions and non-runtime exceptions, each of which is an example.

4. If you do not want to use the tools provided by the Java JDK, you implement a map yourself, what you do.

The difference between 5.Nio and IO.

6. Describe the webservices.

The difference between 7.jsp and servlet.

What 8.JVM performance tuning has done.

9. Talk about how you do business when you use an open source framework in your actual work.

10. What is a thread pool? When do I use the thread pool?

11. If there is a particularly large amount of traffic to the database, how to do optimization.

12. How to locate the bottleneck of system performance? How to cluster? How do I support high concurrency?

Java background test for a small company