GUI program

Implement a simple graphical user interface to simulate a shopping program. When the program is run a login dialog will be presented to the user (use the JPasswordField class as the input component). The password will be stored in an 'encrypted' format in a file called "[login to view URL]". (The original password in the [sample file] is the string "password", the encryption employs the Caesar cipher which shifted each character backward one place in the alphabet ('s' becomes 'r', 'p' becomes 'o' and 'a' wraps around to 'z'). The encrypted version thus becomes "ozrrvnqc". Your program must be able to use any arbitrary password file.