Java in a Nutshell, 5th Edition [Electronic resources] نسخه متنی

This
interface defines the methods required to compute a checksum on a
stream of data. The checksum is computed based on the bytes of data
supplied by the update( ) methods; the current
value of the checksum can be obtained at any time with the
getValue( ) method. reset( )
resets the checksum to its default value; use this method before
beginning a new stream of data. The checksum value computed by a
Checksum object and returned through the
getValue( ) method must fit into a
long value. Therefore, this interface is not
suitable for the cryptographic checksum algorithms used in
cryptography and security. The classes
CheckedInputStream and
CheckedOutputStream provide a higher-level API for
computing a checksum on a stream of data. See also
java.security.MessageDigest.

public interface

Checksum {
// Public Instance Methods
long

getValue ( );
void

reset ( );
void

update (int

b );
void

update (byte[ ]

b , int

off , int

len );
}

Implementations

Adler32, CRC32

Passed To

CheckedInputStream.CheckedInputStream( ),
CheckedOutputStream.CheckedOutputStream( )

Returned By

CheckedInputStream.getChecksum( ),
CheckedOutputStream.getChecksum( )