public static Character toCharacterObject(String str) { if (StringUtils.isEmpty(str)) { return null;
public static Character toCharacterObject(char ch) { if (ch < CHAR_ARRAY.length) { return CHAR_ARRAY[ch];
    public static Character toCharacterObject(String str) {        if (StringUtils.isEmpty(str)) {            return null;        }        return toCharacterObject(str.charAt(0));    }