Why main function inside the class

As the others have said, in Java the main() method must be inside a class.

Similarly, in C# the Main() method must be inside a class or struct (Java doesn't have structs).

This is because Java and C# are pure object oriented languages which don't support global functions.

However, because of its C heritage, C++ supports procedural as well as object oriented programming. Consequently it does support global functions and the main() function must in fact be defined as a global function - it can't be defined as a member function of a class.

Its wrong Alok. Java program may have main function inside of class.

Example:

class Sample {


  public static void main(String[] args) {
    System.out.println("Java rules the world!");  
  }


}

the Above Class will Execute with out any problem.
If one Class is a Resource for another classes , that class may or may not have main method inside. 


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