Using Python 3.5: 2. The following problems relate to an email messaging system.

Question

Using Python 3.5:

2. The following problems relate to an email messaging system. Work all problems in the same file.:

(a) 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 (notice that each line is in a new line):

"From: Harry Morgan To: Rudolf Reindeer . . ."

(b) Design a class Mailbox that stores e-mail messages, using the Message class of Exercise 2a. Implement the following methods:

- def addMessage(self, message)

- def getMessage(self, index)

- def removeMessage(self, index)

(c) Write a program that uses the Message and Mailbox classes from problems 2a and 2b to make a message, print it and store it in a Mailbox.

Explanation / Answer

package emailmodel; 02 03 import java.util.Scanner; 04 public static void main (String[] args) 05 { 06         public class Message 07         { 08             private String senderemail; 09             private String receiveremail; 10               11             //The constructor method 12             public Message(String sender, String receiver) 13             { 14                     senderemail = sender; 15                     receiveremail = receiver; 16             } 17             //Method to display the sender/receiver 18             public void displayMessageDeatails() 19             { 20                 System.out.println("To"+ receiveremail +" "); 21                 System.out.println("From"+ senderemail + " "); 22             } 23             public class MessageExample//Call method to constructor 24             { 25                 public void main(String[] args) 26                 { 27                     Message email = new Message(receiveremail, senderemail); 28                     email.displayMessageDeatails(); 29                 } 30             } 31             /** 32              * Adds a sender email to the message 33              * @param senderemail the sender email 34              */ 35             public void addsenderemail() 36             { 37                 System.out.print("Please enter sender:"); 38                 Scanner se = new Scanner(System.in); 39                 senderemail = se.nextLine(); 40                 se.close(); 41             } 42             /** 43              * Adds a receiver email to the message 44              * @param receiveremail the receiver email 45              */ 46             public void addreceiveremail() 47             { 48                 System.out.print("Please enter receiver:"); 49                 Scanner re = new Scanner(System.in); 50                 receiveremail = re.nextLine(); 51                 re.close(); 52             } 53             /** 54              * Gets the sender email in the current email 55              * @return the senderemail 56              */ 57             public String getsenderemail() 58             { 59                 return senderemail; 60             } 61             /** 62              * Gets the receiver email in the current email 63              * @return the receiveremail 64              */ 65             public String getreceiveremail() 66             { 67                 return receiveremail; 68             } 69               70             public class Append 71             { 72                 int messagebody; 73                 public void main(String args[]) 74                 { 75                     //Appending text of message body 76                     System.out.print("Please enter message body:"); 77                     Scanner in = new Scanner(System.in); 78                     messagebody = in.nextInt(); 79                     //Appended message 80                     String s; 81                     StringBuffer sb = new StringBuffer(40); 82                     s = sb.append(messagebody).toString(); 83                     System.out.println(s + " "); 84                     in.close(); 85                 } 86             } 87         }

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