Question

I’m trying to format a phone number which is stored without formatting in a database.
Now currently I just use substring and String concatination to form the formatted String but I’m looking for a cleaner/faster/less memory intensive method. (and I don’t mean just using a StringBuilder).

I looked at String.format but that only takes a list of parameters (as in …) and not a chararray.

Answer 1

I’ll toss in my 2 cents after some lookup:

import java.swing.text.MaskFormater;

try {
    MaskFormatter formatter = new MaskFormatter("+AA AAA AA AA AA");
    formatter.setValueContainsLiteralCharacters(false);
    System.err.println(formatter.valueToString("31987365414"));
} catch (ParseException e) {

}