//A Java Program to illustrate Caesar Cipher Technique
class CaesarCipher
{
// Encrypts text using a shift od s
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;
}
// Driver code
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));
}
}