public class FilterOutputStream extends OutputStream
 The class FilterOutputStream itself simply overrides
 all methods of OutputStream with versions that pass
 all requests to the underlying output stream. Subclasses of
 FilterOutputStream may further override some of these
 methods as well as provide additional methods and fields.
| Modifier and Type | Field and Description | 
|---|---|
| protected OutputStream | outThe underlying output stream to be filtered. | 
| Constructor and Description | 
|---|
| FilterOutputStream(OutputStream out)Creates an output stream filter built on top of the specified
 underlying output stream. | 
| Modifier and Type | Method and Description | 
|---|---|
| void | close()Closes this output stream and releases any system resources
 associated with the stream. | 
| void | flush()Flushes this output stream and forces any buffered output bytes
 to be written out to the stream. | 
| void | write(byte[] b)Writes  b.lengthbytes to this output stream. | 
| void | write(byte[] b,
     int off,
     int len)Writes  lenbytes from the specifiedbytearray starting at offsetoffto
 this output stream. | 
| void | write(int b)Writes the specified  byteto this output stream. | 
protected OutputStream out
public FilterOutputStream(OutputStream out)
out - the underlying output stream to be assigned to
                the field this.out for later use, or
                null if this instance is to be
                created without an underlying stream.public void write(int b)
           throws IOException
byte to this output stream.
 
 The write method of FilterOutputStream
 calls the write method of its underlying output stream,
 that is, it performs out.write(b).
 
Implements the abstract write method of OutputStream.
write in class OutputStreamb - the byte.IOException - if an I/O error occurs.public void write(byte[] b)
           throws IOException
b.length bytes to this output stream.
 
 The write method of FilterOutputStream
 calls its write method of three arguments with the
 arguments b, 0, and
 b.length.
 
 Note that this method does not call the one-argument
 write method of its underlying stream with the single
 argument b.
write in class OutputStreamb - the data to be written.IOException - if an I/O error occurs.write(byte[], int, int)public void write(byte[] b,
                  int off,
                  int len)
           throws IOException
len bytes from the specified
 byte array starting at offset off to
 this output stream.
 
 The write method of FilterOutputStream
 calls the write method of one argument on each
 byte to output.
 
 Note that this method does not call the write method
 of its underlying input stream with the same arguments. Subclasses
 of FilterOutputStream should provide a more efficient
 implementation of this method.
write in class OutputStreamb - the data.off - the start offset in the data.len - the number of bytes to write.IOException - if an I/O error occurs.write(int)public void flush()
           throws IOException
 The flush method of FilterOutputStream
 calls the flush method of its underlying output stream.
flush in interface Flushableflush in class OutputStreamIOException - if an I/O error occurs.outpublic void close()
           throws IOException
 The close method of FilterOutputStream
 calls its flush method, and then calls the
 close method of its underlying output stream.
close in interface Closeableclose in interface AutoCloseableclose in class OutputStreamIOException - if an I/O error occurs.flush(), 
out Submit a bug or feature 
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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