Help with message class

[eel]

May I know how to create message class in order to store input data from the command line, so that the output will come from this class?

[travishein]

Maybe, you can create a class that uses a ByteArrayOutputStream, where things that get written to System.out instead would go into this ByteArrayOutputStream, which you could then later have it output.

[Norm]

class in order to store input data from the command line

That sounds like what the Scanner class can do.

output will come from this class

What output? How is it generated?
Usually you send output to a class.

[eel]

create the PMC that prompts user for typical email fields and writes SMTP protocol messages to an output file.