Java™ Platform
Standard Ed. 6

java.util.zip
Class CRC32

java.lang.Object
  extended by java.util.zip.CRC32
All Implemented Interfaces:
Checksum

public class CRC32
extends Object
implements Checksum

A class that can be used to compute the CRC-32 of a data stream.

See Also:
Checksum

Constructor Summary
CRC32()
          Creates a new CRC32 object.
 
Method Summary
 long getValue()
          Returns CRC-32 value.
 void reset()
          Resets CRC-32 to initial value.
 void update(byte[] b)
          Updates checksum with specified array of bytes.
 void update(byte[] b, int off, int len)
          Updates CRC-32 with specified array of bytes.
 void update(int b)
          Updates CRC-32 with specified byte.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

CRC32

public CRC32()
Creates a new CRC32 object.

Method Detail

update

public void update(int b)
Updates CRC-32 with specified byte.

Specified by:
update in interface Checksum
Parameters:
b - the byte to update the checksum with

update

public void update(byte[] b,
                   int off,
                   int len)
Updates CRC-32 with specified array of bytes.

Specified by:
update in interface Checksum
Parameters:
b - the byte array to update the checksum with
off - the start offset of the data
len - the number of bytes to use for the update

update

public void update(byte[] b)
Updates checksum with specified array of bytes.

Parameters:
b - the array of bytes to update the checksum with

reset

public void reset()
Resets CRC-32 to initial value.

Specified by:
reset in interface Checksum

getValue

public long getValue()
Returns CRC-32 value.

Specified by:
getValue in interface Checksum
Returns:
the current checksum value

Java™ Platform
Standard Ed. 6

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For further API reference and developer documentation, see Java SE Developer Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

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