Java Programming

Provide a class for authoring a simple letter. In the constructor, supply the names of the sender and the recipient: public Letter(String from, String to) Supply a method public void addLine(String line) to add a line of text to the body of the letter. Supply a method public String getText() that returns the entire text of the letter. The text has the form:


Dear recipient name :
blank line
first line of the body
second line of the body
. . .
last line of the body
blank line
Sincerely,
blank line
sender name

Also supply a program LetterPrinter that prints this letter:

Dear John:

I am sorry we must part.
I wish you all the best.

Sincerely,

Mary

Construct an object of the Letter class and call addLine twice.

Hints: (1) Use the concat method to form a longer string from two shorter strings. (2) The special string "\n" represents a new line. For example, the statement

body = body.concat("Sincerely,").concat("\n");

adds a line containing the string "Sincerely," to the body.

Complete the following class in your solution:

/**
This class models a simple letter.
*/
public class Letter
{

/**
Constructs a letter with a given sender and recipient.
@param from the sender
@param to the recipient
*/
public Letter(String from, String to)
{
. . .
}

/**
Adds a line to the body of this letter.
*/
public void addLine(String line)
{
. . .
}

/**
Gets the text of this letter.
*/
public String getText()
{
. . .
}
private String sender;
private String recipient;
private String body;
}