Question: Write a Java program that can perform the Caesar cipher for English messages that include both upper- and lowercase alphabetic characters. The Caesar cipher replaces

Write a Java program that can perform the Caesar cipher for English messages that include both upper- and lowercase alphabetic characters.

The Caesar cipher replaces each plaintext letter with a different one, by a fixed number of places down the alphabet. The cipher illustrated here uses a left shift of three, so that (for example) each occurrence of E in the plaintext becomes B in the ciphertext.

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