Concept explainers
Open the mail-system project, which you can find in the book's support material. The idea of this project is to simulate the act of users sending mail items to each other. A user uses a mail client to send mail items to a server, for delivery to another user's mail client. First create a Mail Server object. Now create a Mai1C1ient object for one of the users. When you create the client, you will need to supply a Mail Server instance as a parameter. Use the one you just created. You also need to specify a username for the mail client. Now create a second MailClient in a similar way, with a different username.
Experiment with the MailCIient objects. They can be used for sending mail items from one mail client to another (using the sendMai1 Item method) and receiving messages (using the getNextMailItem or printNextMailItem methods).
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