Create an interface “MessageEncoder’ that has a single abstract method “encode (plain Text)”, where plaintext is the message to be encoded. The method will return the encoded message. Create a class...

Create an interface “MessageEncoder’ that has a single abstract method “encode (plain Text)”, where plaintext is the message to be encoded. The method will return the encoded message. Create a class “ShuffleCipher” that implements the interface “MessageEncoder”. The constructor should have one parameter called n. Define the method “encode ()” so that n swaps are made on the message string, a swap is done on two characters of the string at a time, starting from the corner two elements.

For example, if the message is abcdefghi. Suppose we have to do n=2 swaps.

In the First swap, the characters ‘a’ & ‘i’ are swapped. The message after first swap is “ibcdefgha”.

In the Second swap, the characters ‘b’ & ‘h’ are swapped. The message after second swap is “ihcdefgba”.

The final answer is “ihcdefgba”.