level 0 : 05 Step by step interview question to crack the interview.

1. what are different between source code, byte code and executable code ?
2. what is JIT in java ?
3. how JIT works in java?
4. what is the role of cache while conversion of byte code instruction into machine code by JIT ?
5. do you know about the architecture of JVM ?
6. what is class loader in java ?
7. how many type of class loader are there in java ?
8. what is bootstrap class loader ?
9. how many class does rt.jar file conatin ?
10. in below code how many classes is loaded from library classes along with callkr class ?

  class callkr {

    public static void main(String args[]){

    System.out.println("welcome to java-till-data");
    }

   }

11. what is system class loader ?

12. which is the default class path to load class by system class loader?

13. what is extension class loader ?

14. from where does extension class loader loaded the class ?

15. where we can find ext folder in java ?

16. if we will keep our .class file in ext folder, will it be loaded by extension class loader?

17. what are the steps to keep our class named 'callkr' 

    in ext folder of jre\lib\ext to be automatically loaded by the extension class loader?

18. what is jar tool and where we can find jar tool ?

19. what is a command to make a .jar and also tell the command of uncompress .jar ?

20. what this cvf switches mean while executing jar tool ?