need java code

This is for you security people out there. Write a program that asks the user for a message or a code. If the user selects message, convert the message to a code using a cypher of your design. If the user selects code, then decrypt the cypher and print the message.

SAMPLE RUN #1:

Please enter (Message/Code): Message

Please enter the message: Please send money!

Here is your code: 16534e4r43wr4

SAMPLE RUN #2:

Please enter (Message/Code): Code Please enter the code: 16534e4r43wr4 Here is your message: Please send money!