Answered: Using JAVA Part A) Design a class…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Using JAVA

Part 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:

1) A constructor that takes the sender and recipient.

2) 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: “From: Harry Morgan%nTo: Rudolf Reindee%n . . . “

Write a program that uses this class to make a message and print it.

Part B) Design a class Mailbox that stores e-mail messages, using the Message class in part a) Implement the following methods in the Message class.

public void addMessage(Message m) // Adds Message M to the Mailbox
public Message getMessage(int i) // returns the ith message from the Mailbox
public void removeMessage(int i) // removes the ith message from the Mailbox
public int mailBoxSize () // returns the number of messages in the Mailbox

Write a program to demonstrate the functionality of the Mailbox. Add messages to the Mailbox, print messages from the Mailbox, then remove a message form the Mailbox.

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I am recieving error "void cannot be dereferenced" and therefore "cannot envoke toString()"

How would one fix this?

System.out.println(mailbox.getMessage(0).toString());
System.out.println(mailbox.getMessage(1).toString());

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