Create an interface MessageDecoder that has a single abstract method decode(cipherText), where cipherText is the message to be decoded.The method will return the decoded message. Create a class SubstitutionCipher that implements the interface MessageDecoder as described above. The constructor should have one parameter called shift. Define the method decode so that each letter is shifted by the value in the shif. For example, if shift is 3, a will be replaced by d, b will be replaced bt e, c will be replaced by f, and so on. Hint: You may wish to define a private method that shifts a single character. Create a class ShuffleCipher that implements the interface MessageDecoder. The constructor should have one parameter called n. Define the method decode so that the message is shuffledn times.To perform one shuffle, split the message in half and then take the characters from each half alternatively. For example, if the messsage is "abcdefghi", the halves are "abcde" and "fghi". The shuffled message is "afbgchdie". Hint You may wish to define a private method that performs one shuffle. Finally, write a program that allows the user to encode and decode messages entered on the keyboard.
Create an interface MessageDecoder that has a single abstract method decode(cipherText), where cipherText is the message to be decoded.The method will return
the decoded message.
Create a class SubstitutionCipher that implements the interface MessageDecoder as described above. The constructor
should have one parameter called shift. Define the method decode so that each letter is shifted by the value in the shif. For example, if shift is 3, a will be replaced
by d, b will be replaced bt e, c will be replaced by f, and so on. Hint: You may wish to define a private method
that shifts a single character.
Create a class ShuffleCipher that implements the interface MessageDecoder. The constructor should have
one parameter called n. Define the method decode so that the message is shuffledn times.To perform one shuffle, split the message in half and then take the characters
from each half alternatively. For example, if the messsage is "abcdefghi", the halves are "abcde" and "fghi". The shuffled message is "afbgchdie". Hint You may wish
to define a private method that performs one shuffle.
Finally, write a program that allows the user to encode and decode messages entered on the keyboard.
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