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

This class is a subclass of
java.io.FilterInputStream; it allows a stream to
be read and a checksum computed on its contents at the same time.
This is useful when you want to check the integrity of a stream of
data against a published checksum value. To create a
CheckedInputStream, you must specify both the
stream it should read and a Checksum object, such
as CRC32, that implements the particular checksum
algorithm you desire. The read( ) and
skip( ) methods are the same as those of other
input streams. As bytes are read, they are incorporated into the
checksum that is being computed. The getChecksum(
) method does not return the checksum value itself, but
rather the Checksum object. You must call the
getValue( ) method of this object to obtain the
checksum value.

Figure 16-135. java.util.zip.CheckedInputStream

public class

CheckedInputStream extends java.io.FilterInputStream {
// Public Constructors
public

CheckedInputStream (java.io.InputStream

in , Checksum

cksum );
// Public Instance Methods
public Checksum

getChecksum ( );
// Public Methods Overriding FilterInputStream
public int

read ( ) throws java.io.IOException;
public int

read (byte[ ]

buf , int

off , int

len ) throws java.io.IOException;
public long

skip (long

n ) throws java.io.IOException;
}