Billing Statement

I want to write a character encryption program that has to take an input,encrypt it and display the encrypted output.

Hint: A = @
B = a
C = b
D = c
E = d

eg: input = Hello World
output = gdkkn vnqkc

import org.apache.commons.lang.StringUtils;
public class Test {
public static void main(String[] args) {
String s = "Hello World";
StringBuffer output = new StringBuffer();
s = StringUtils.lowerCase(s);
for (int i=0; i < s.length() ; i++){
char c = s.charAt(i);
int charCode = (int) c;
charCode–;
output.append((char) charCode);
}

System.out.println("Output = " + output);
}
}

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