Storing constants in Java -

i have table of chars , each char int value affected. (i use table calculate barcode check digit).

i want store table constants, best way in java please? (enum, hashmap...)

any appreciated.

if mapping between letters , codes in own answer, not need table. can simple translation method:

public static int lettertocode(char letter) {     if (letter >= '0' && letter <= '9') {         return letter - '0';     } else if (letter >= 'a' && letter <= 'z') {         return letter - 'a' + 10;     } else {         throw new illegalargumentexception("invalid letter: " + letter);     } }  public static char codetoletter(int code) {     if (code >= 0 && code <= 9) {         return (char) ('0' + code);     } else if (code >= 10 && code <= 35) {         return (char) ('a' + code - 10);     } else {         throw new illegalargumentexception("invalid code: " + code);     } } 

this not perform worse looking code or letter in map.