Caeser Cipher Hack 

public class CaesarCipher {

    public static String cipher(String message, String[] letters, int n) {
        
        String newMessage = "";

        for (int i=0; i<message.length(); i++) {
            int index = 0;
            for (int j=0; j<letters.length; j++) {
                if (message.substring(i, i+1).equals(letters[j])) {
                    index = j;
                }
            }
            index += n;
            if (index > 25) {
                index -= 26;
            }
            newMessage += letters[index];
        }
        return newMessage;
    }

    public static void main(String[] args) {

        String[] letters = {"a", "b", "c", "d", "e", "f", "g", "h", "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u", "v", "w", "x", "y", "z"};
        String message1 = "Kfzb gly!";
        String message2 = "zlab zlab zlab";
        String message3 = "prmbozxifcoxdfifpqfzbumfxifalzflrp";

        System.out.println(cipher(message1, letters, 3));
        System.out.println(cipher(message2, letters, 3));
        System.out.println(cipher(message3, letters, 3));
    }

}

CaesarCipher.main(null);

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