21.  Does the order of public and static declaration matter in main() method?

22.  Can a source file contain more than one class declaration?

23.  What is a package?

24.  Which package is imported by default?

25.  Can a class declared as private be accessed outside it's package?

26.  Can a class be declared as protected?

27.  What is the access scope of a protected method?

28.  What is the purpose of declaring a variable as final?

29.  What is the impact of declaring a method as final?

30.  I don't want my class to be inherited by any other class. What should i do?