This class is a subclass of java.io.FilterOutputStream that allows data to be written to a stream and a checksum computed on that data at the same time. To create a CheckedOutputStream, you must specify both the output stream to write its data to and a Checksum object, such as an instance of Adler32, that implements the particular checksum algorithm you desire. The write( ) methods are similar to those of other OutputStream classes. The getChecksum( ) method returns the Checksum object. You must call getValue( ) on this object in order to obtain the actual checksum value.

Figure 16-136. java.util.zip.CheckedOutputStream

public class CheckedOutputStream extends java.io.FilterOutputStream {
// Public Constructors
     public CheckedOutputStream(java.io.OutputStream out, Checksum cksum);  
// Public Instance Methods
     public Checksum getChecksum( );  
// Public Methods Overriding FilterOutputStream
     public void write(int b) throws java.io.IOException;  
     public void write(byte[ ] b, int off, int len) throws java.io.IOException;  
}