Program plan: Mailbox.java Define a class named “Mailbox” that stores e-mail messages. Declare an “ArrayList” variable named “messages”. Create a constructor named “Mailbox” and initializes an empty arraylist. Define a function named “addMessage” and then add the message “m” into the “messages” arraylist. Define a function named “getMessage”, using that retrieve and return the message stored in the position “i” of the “messages” arraylist. Define a function named “removeMessage”, and then remove the message stored in the position “i” of the “messages” arraylist. Message.java: Define a class named “Message” and the keyword “extends” indicates that a class is inherited from another class named “Mailbox”. Declare three String variables named “recipient”, “sender”, and “messageText”. Create a constructor named “Message” with two arguments. Assign the value of the variable “recipient” into the variable “this.recipient”. Assign the value of the variable “sender” into the variable “this.sender”. Assign the empty string into the variable “messageText”. Define a function named “append”. Appends a line of text to the message body and append it into a variable named “messageText”. Define a String function named “toString”. Return the message into one long string. Define a function named “print” Using the “Print” statement, call the function “toString()” and print the message text. TestMessage.java: Define another class named “TestMessage”. Define a main function. Create an object named “email” of class “Message”. Call the function “addMessage()” of “email” object to add a new message. Call the function “append()” of “email” object to append the lines of text to the message body. Create an object named “email2” of class Message Call the function “addMessage()” of “email2” object to add a new message. Call the function “append()” of “email2” object to append the lines of text to the message body Call the function “getMessage()” of “email” object to retrieve a message. Call the function “getMessage()” of “email2” object to retrieve a message. Call the function “removeMessage()” of “email” object to remove a message. Call the function “removeMessage()” of “email2” object to remove a message.

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Chapter 8, Problem 16PP

Program Plan Intro

Program plan:

Mailbox.java

Define a class named “Mailbox” that stores e-mail messages.

Declare an “ArrayList” variable named “messages”.

Create a constructor named “Mailbox” and initializes an empty arraylist.

Define a function named “addMessage” and then add the message “m” into the “messages” arraylist.

Define a function named “getMessage”, using that retrieve and return the message stored in the position “i” of the “messages” arraylist.

Define a function named “removeMessage”, and then remove the message stored in the position “i” of the “messages” arraylist.

Message.java:

Define a class named “Message” and the keyword “extends” indicates that a class is inherited from another class named “Mailbox”.

Declare three String variables named “recipient”, “sender”, and “messageText”.

Create a constructor named “Message” with two arguments.

Assign the value of the variable “recipient” into the variable “this.recipient”.

Assign the value of the variable “sender” into the variable “this.sender”.

Assign the empty string into the variable “messageText”.

Define a function named “append”.

Appends a line of text to the message body and append it into a variable named “messageText”.

Define a String function named “toString”.

Return the message into one long string.

Define a function named “print”

Using the “Print” statement, call the function “toString()” and print the message text.

TestMessage.java:

Define another class named “TestMessage”.

Define a main function.

Create an object named “email” of class “Message”.

Call the function “addMessage()” of “email” object to add a new message.

Call the function “append()” of “email” object to append the lines of text to the message body.

Create an object named “email2” of class Message

Call the function “addMessage()” of “email2” object to add a new message.

Call the function “append()” of “email2” object to append the lines of text to the message body

Call the function “getMessage()” of “email” object to retrieve a message.

Call the function “getMessage()” of “email2” object to retrieve a message.

Call the function “removeMessage()” of “email” object to remove a message.

Call the function “removeMessage()” of “email2” object to remove a message.

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