Java

2.6: Draw a UML diagram to represent the Mail System.

2.7: Draw a UML diagram to represent the Banking System.

2.8 Design a UML Class Diagram to represent how you might structure this system.

A voice mail system records calls to multiple mailboxes. The system records each message, the caller's number, and the time of the call. The owner of a mailbox can play back saved messages and see a list of the messages they have received.