Java return value

Main always returns void in Java. If you want your program to return an error value use System.exit()

Yes, in Java main is always public static void main(String[] args). Why would you want it to return a value anyways? It would just be returning to the enclosing java.exe process and not to the OS, which isn't very useful.

To exit and return a code to the OS, use System.exit(int code).

Use java.lang.System.exit(int status) to return a non-zero status code.

I guess you are looking for System.exit(int retValue)

yes , its true , you should call the function from the main with the class object .. or declare the function as static and call from main to do the work

Yes, The "main" function is the start of execution for your program, it's a "special" function which serves as the entry point to the application - you are not supposed to call it from other code and it does not return a value