Need some help with Java. This is my project:

This project involves writing a program that encodes and decodes messages. The program should prompt the user to select whether a message is to be encoded or decoded, and then prompts the user to enter the message. A blank space is used to separate each word in the message, and a period (.) is used to denote the end of a sentence. Separate methods must be used to encode and decode the input message. The coding scheme is very simple: the code equivalent for the letter A is Z, for B is Y, , and for Z is A Please make this simple as I have just started learning