JAVA Interview Questions - 2

1. * Can a lock be acquired on a class?
2. * What happens when you invoke a thread's interrupt method while it is sleeping or waiting?
3. * What is static variable?
4. * What is Singleton class?
5. * What is the middleware? What is the functionality of Web server?
6. * What is the difference in between C++ and Java? Can u explain in detail?
7. * What value does readLine() return when it has reached the end of a file?
8. * What is the command pattern? Where it is used?
9. * Can a Byte object be cast to a double value?
10. * What happens when a thread cannot acquire a lock on an object?
11. * What is typecasting?
12. * What is JVM?
13. * What is JNI?
14. * Can a for statement loop indefinitely?
15. * What is the difference between a Window and a Frame?
16. * Are true and false keywords?
17. * What is final method?
18. * What is JAR file?
19. * What is the difference between Hash map and Hash table?