How do I increment a variable to the next or previous letter in the alphabet?

Question

I have a capital letter defined in a variable string, and I want to output the next and previous letters in the alphabet. For example, if the variable was equal to \'C\'

Answer 1

One way:

String value = "C";
int charValue = value.charAt(0);
String next = String.valueOf( (char) (charValue + 1));
System.out.println(next);