Java Questions

1. Java
1. How does exception handling in Java work, tell me about the different types of exceptions in Java.
2. What is Polymorphism ?
3. What is hashcode ?
4. How are hashcode and equals related ?
5. How do threads communicate ?
6. Write a code to iterate through a map and print its values.
7. You have data that needs to be displayed on a webpage, exported to PDF and exported to XLS, how would you go about the implementation.
8. What are generics ?
9. What is the difference between protected and default scope ?
10. How would you create a servlet ?
11. What are filters used for?
12. How do we take the thread dump?
2. Java-script
1. What is a JQuery selector ?
2. Among the frameworks like Angular/extJs, etc which one do you prefer to use in a new project and why ?
3. Do you know about closures in Javascript ?
3. Database
1. Tell me any area where you feel MySQL is better than Oracle ?
4. General
1. Tell me about your best career achievement.