3.7 Exercise 1: Greetings

Time for an exercise. Exercise 1 is as follows:

Write a Java application called Greetings
The application should accept a command line argument and treat it as a name.
If a command line argument is supplied then the application should print the message "Greetings, xxxxx", where xxxxx is the command line argument, and then exit.
If no argument is supplied then then application should print the message "What is you name ?" and then exit.