Caesar Cipher

 class CaesarCipher
{
 public static StringBuffer encrypt(String text, int s)
 {
 StringBuffer result= new StringBuffer();
 for (int i=0; i<text.length(); i++)
 {
 if (Character.isUpperCase(text.charAt(i)))
 {
 char ch = (char)(((int)text.charAt(i) + s - 65) % 26 + 65);
 result.append(ch);
 }
 else
 {
 char ch = (char)(((int)text.charAt(i) + s - 97) % 26 + 97);
 result.append(ch);
 }
 }
 return result;
 }
 public static void main(String[] args)
 {
 String text = "ATTACKATONCE";
 int s = 4;
 System.out.println("Text : " + text);
 System.out.println("Shift : " + s);
 System.out.println("Cipher: " + encrypt(text, s));
 }
}