Better checksum in Java

You were also pissed off by the need of writing shitcode like you can find on RoseIndia examples while striving to get a way to represent digest bytes as a hexadecimal string, right? Here is a better way:

MessageDigest digest = MessageDigest.getInstance("SHA1"); // Or MD5...
digest.update("hello world");
String hexdigest = new BigInteger(1, digesst.digest()).toString(16);

And that's it.