level 0 : 02 Step by step interview question to crack the interview.

1. what is jdk?
2. do jdk has jre in it?
3. why do we install jdk?
4. where we can find java and javac tool?
5. can we separately install jre in our system?
6. jre is plate form independent or plate form dependent?
7. what make jre plate form dependent?
8. what java run time do ?
9. what happens when we compile any java file : javac  test.java ?
10. what is difference between .java file and .class file?
11. what is jvm and where we can find jvm ?
12. what is libraries in java?
13. what is rt.jar in java ?
14. where to find rt.jar in java ?
15. how to extract rt.jar with command line?
16. how to generate doc file in java .
17. how many classes do jdk1.8 has?
18. what is jre and private jre? Is there any different in both?
19. can we run executable file in private jre?
20. how to start jvm?
21. when to use javap, javadoc,javatool?
22. what do u mean by satting aclass path?
23. what does set path="path"; means?
24. what is byte code in java?
25. why we call .class as a byte code?
26. what is different between System.out.println() and System.out.print(); ?
27. write a java program to fine a factorial no?