A Java main method uses the parameter (String[ ] variable) so that a user can run the program and supply "command-line" parameters. Since the parameter is a String array, however, the user does not have to supply any parameters.
Java and some other object oriented programs makes use of the command line arguments. This enables one to pass additional information to a program when it is run. whatever information that is passed to the program at the command line argument will accompany the program when is it run and java stores this information as an array of strings.
