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/**

* Write a description of CaesarCipher here.

*

* @author (your name)

* @version (a version number or a date)

*/

public class CaesarCipher {

public String upper = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

public String lower = "abcdefghijklmnopqrstuvwxyz";

public String encrypt(String input, int keyA, int keyB){

StringBuilder builder = new StringBuilder();

for(int i = 0; i < input.length(); ++i){

char tmp = input.charAt(i);

if(Character.isAlphabetic(tmp)){

int index = 0;

boolean lowerCase = false;

if(tmp >= 'a' && tmp <= 'z'){

index = tmp-'a';

lowerCase = true;

}

else index = tmp-'A';

if((i & 1) == 0) index+=keyA;

else index+=keyB;

index = index % 26;

tmp = lowerCase?lower.charAt(index):upper.charAt(index);

}

builder.append(tmp);

}

return builder.toString();

}

public void testCaesar(){

return;

}

public static void main(String[] args){

CaesarCipher x = new CaesarCipher();

System.out.println(x.encrypt("At noon be in the conference room with your hat on for a surprise party. YELL LOUD!", 15, 15));

}

}