Interview: Java along with Algorithm 2

After clearing questions in the first round, I was asked to face the interviewer in F2F rounds. I was nervous to face the interviewers after a long long time.

It all started with the general introductory question and followed with the following questions.

1. Difference between Restful and Soap web services?
2. What is Soap WS?
3. Which different XML parsers we have?
4. Write code for stream parser?
5. Tell me the class loader heirarchy?
6. What is serialization?
7. What is SerialVersionUID?
8. How does Hashmap work?
9. What are the differences between SynchronizedHashMap and ConcurrentHashMap?
10. Implement stack using 2 queues?
11. Implement stack using 1 queue?
12. Sort an array containing numbers 0,1,2?
13. Difference between abstraction and encapsulation?
14. where will you categories the private method?
15. How to stop subclass from serializing if super-class is serializable?

I will try to post answers to following question within some time.