How to convert an alphanumeric phone number to digits

Question

UPDATE:

The final version of my utility looks like this:

StringBuilder b = new StringBuilder();

for(char c : inLetters.toLowerCase(         


        

Answer 1

You could do this using the Apache Commons Lang StringUtils, as follows:

String output = StringUtils.replaceChars(StringUtils.lowerCase(input),
                    "abcdefghijklmnopqrstuvwxyz",
                    "22233344455566677778889999");

Assuming speed is not your main concern, of course, and you want a compact solution ;)