Checksum

All Known Implementing Classes:

Adler32, CRC32
```
public interface Checksum
```
Interface to compute a data checksum used by checked input/output streams. A data checksum can be updated by one byte or with a byte array. After each update the value of the current checksum can be returned by calling getValue. The complete checksum object can also be reset so it can be used again with new data.

See Also:

CheckedInputStream, CheckedOutputStream

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`long`	`getValue()`	Returns the data checksum computed so far.
`void`	`reset()`	Resets the data checksum as if no update was ever called.
`void`	`update(byte[] buf, int off, int len)`	Adds the byte array to the data checksum.
`void`	`update(int bval)`	Adds one byte to the data checksum.

- Method Detail
  - getValue
```
long getValue()
```
    Returns the data checksum computed so far.
  - reset
```
void reset()
```
    Resets the data checksum as if no update was ever called.
  - update
```
void update(int bval)
```
    Adds one byte to the data checksum.
    
    Parameters:
    
    bval - the data value to add. The high byte of the int is ignored.
  - update
```
void update(byte[] buf,
            int off,
            int len)
```
    Adds the byte array to the data checksum.
    
    Parameters:
    
    buf - the buffer which contains the data
    
    off - the offset in the buffer where the data starts
    
    len - the length of the data