Design a class Mailbox that stores e-mail messages, using the Message class of Exercise P8.15. Implement the following methods:

• public void addMessage(Message m)
• public Message getMessage(int i)
• public void removeMessage(int i)

Data from Exercise P8.15.

Design a class Message that models an e-mail message. A message has a recipient, a sender, and a message text. Support the following methods:

• A constructor that takes the sender and recipient
• A method append that appends a line of text to the message body
• A method toString that makes the message into one long string like this: "From:

Harry Morgan%nTo: Rudolf Reindeer%n . . ." Write a program that uses this class to make a message and print it.