base62 for Java

base62.java

    public static final String CODES = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";

    public static String toBase62(int value) {
        final StringBuilder sb = new StringBuilder(1);

        do {
            sb.insert(0, CODES.charAt(value % 62));
            value /= 62;
        } while (value > 0);

        return sb.toString();
    }

    public static long toBase10(String value) {
        value = new StringBuffer(value).reverse().toString();

        int ret = 0;
        int count = 1;
        for (char character : value.toCharArray()) {
            ret += CODES.indexOf(character) * count;
            count *= 62;
        }

        return ret;
    }