JAVA Interview Questions - 1

1. * Why do you create interfaces, and when MUST you use one?
2. * How to make application thread-safe?
3. * Are constructors inherited? Can a subclass call the parent's class constructor? When?
4. * Why Java is not fully object oriented?
5. * Can an exception be re thrown?
6. * What are wrapped classes?
7. * Can a lock be acquired on a class?
8. * Difference between Array List and Vector?
9. * What is synchronization and why is it important?
10. * Can a double value be cast to a byte?
11. * Name four Container classes?
12. * What are wrapped classes?
13. * What is the difference between Serializalble and Externalizable interface?
14. * How Linked list can be implemented in java with out using collection framework?
15. * How many different types of JDBC drivers are present? Discuss them.
16. * Which class is extended by all other classes?
17. * A local inner class may be final or abstract?
18. * What is transient variable?
19. * Can the abstract class be final?
20. * How will you pass values from HTML page to the Servlet?
21. * Explain tier and -tier Architecture?