Java IO.pdf - Nguyen Dang Binh

Java I/O
After each successful call to update(), you can clone the digest and invoke the digest()
method on the clone. This lets you inspect the digest without interfering with the data that still
needs to be processed. This might be useful if you have an exceptionally large amount of data
read from a slow connection, and you don't want to wait for the end of the stream before
checking whether or not the data is corrupt. Of course, you would need the intermediate
digests for the original data, in addition to the digests for the data you're checking.
10.2.9 toString( )
For completeness' sake, I'll note that MessageDigest overrides toString():
public String toString()
This returns a string in the form "algorithm Message Digest from provider,
" or "