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A cryptogram is a message that is encoded by replacing each letter i

A cryptogram is a message that is encoded by replacing each letter i

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A cryptogram is a message that is encoded by replacing

each letter in a message by another. In the original

message, all occurrences of a single letter are

all replaced by the same new letter in the encoded

message. Additionally, there is a one-to-one mapping

between letters in the original message and letters in

the encoded message. This means that no two different

letters in the original message are replaced with the same

letter.

You are going to write a program that allows the user to

type in an encoded cryptogram message. The user will

then be able to try to decode the message by replacing

letters one at a time in the message until the message is

completely decoded. In this program, you will need one

class named Cryptogram that will use ArrayLists or

(Vectors) to store the messages. You will also provide a

MissingLetterException class and a InvalidInputException

class for input errors.

SETUP

Use two ArrayLists or (Vectors) of Character objects to

store the characters of the encoded message and the

decoded message respectively. The encoded message

will NOT be read in from the keyboard. You are to store

the encoded message directly in the program as a

\"constant\" (this is done to simplify grading). You can do

this by defining a String object that is initialized to the

encoded message. Then add each character of the

message into an ArrayList (or Vector). Set up the second

ArrayList (or Vector) so that it is an exact copy of the

encoded message, except that each letter is replaced with

an asterisk (*). For example, here is the encoded

message you will be using:

Encoded Message: X AQC\'M YCQO OKJM BQG OJCM

DGM X SJC\'M WXZP XM JCB TQVP

Decoded Message: * ***\'* **** **** *** **** *** * ***\'* ****

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** *** ****

Note that non-letters are not encoded (e.g. the quote).

INPUT & OUTPUT PROCESSING

Input will come from the keyboard in this program. The

user will enter a letter from the encoded message, and

then the user will enter what to change the letter to

in the original message. For example, it might look like

this (user input in purple):

Pick a letter from encoded message: M

Replace with which letter (A-Z,*): S

Encoded Message: X AQC\'M YCQO OKJM BQG OJCM

DGM X SJC\'M WXZP XM JCB TQVP

Decoded Message: * ***\'S **** ***S *** ***S **S * ***\'S

**** *S *** ****

The user may replace a letter with an asterisk (*). For

example, the next input might look like this (user input in

purple):

Pick a letter from encoded message: M

Replace with which letter (A-Z,*): *

Encoded Message: X AQC\'M YCQO OKJM BQG OJCM

DGM X SJC\'M WXZP XM JCB TQVP

Decoded Message: * ***\'* **** **** *** **** *** * ***\'* ****

** *** ****

The user will continue to decode the message, one letter

at a time. If the decoded message has NO ASTERISKS,

you should ask the user if the message is decoded. If

it is, your program should end. Otherwise, it will continue

to ask for letters.

EXCEPTION PROCESSING

If the user inputs a letter not in the encoded message, you

should throw a LetterMissingException. The exception

handler should report the error and prompt the user

for another letter until the user finally enters a letter in the

encoded message. If the user inputs a character for the

decoded message that is not a letter or an

asterisk, you should throw a InvalidInputException. The

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A cryptogram is a message that is encoded by replacing each letter in a message by another. In the original message, all occurrences of a single letter are all replaced by the same new letter in the encoded message. Additionally, there is a one -to-one mapping between letters in the original message and letters in the encoded message. This means that no two different letters in the original message are repla ced with the same letter. You are going to write a program that allows the user to type in an encoded cryptogram message. The user will then be able to try to decode the message by replacing letters one at a time in the message until the message is completely decoded. In this program, you will need one class named Cryptogram that will use ArrayLists or (Vectors) to store the messages. You will also provide a MissingLetterException class and a InvalidInputException class for input errors. SETUP Use two ArrayLists or (Vectors) of Character objects to store the characters of the encoded message and the decoded message respectively. The encoded message will NOT be read in from the keyboard. You are to store the encoded message directly in the program as a \"constant\" (this is done to simplify grading). You can do this by defining a String object that is initialized to the encoded message. Then add each character of the message into an ArrayList (or Vector). Set up the second ArrayList (or Vector) so that it is an exact copy of the encoded message, except that each letter is ...
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