All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class java.io.FilterOutputStream 

java.lang.Object
   |
   +----java.io.OutputStream
           |
           +----java.io.FilterOutputStream
public class FilterOutputStream
extends OutputStream
This class is the superclass of all classes that filter output streams. These streams sit on top of an already existing output stream (the underlying output stream), but provide additional functionality.

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.

Variable Index

o out
The underlying output stream.

Constructor Index

o FilterOutputStream(OutputStream)
Creates an output stream filter built on top of the specified underlying output stream.

Method Index

o close()
Closes this output stream and releases any system resources associated with the stream.
o flush()
Flushes this output stream and forces any buffered output bytes to be written out to the stream.
o write(byte[])
Writes b.length bytes to this output stream.
o write(byte[], int, int)
Writes len bytes from the specified byte array starting at offset off to this output stream.
o write(int)
Writes the specified byte to this output stream.

Variables

o out 
 protected OutputStream out
The underlying output stream.

Constructors

o FilterOutputStream 
 public FilterOutputStream(OutputStream out)
Creates an output stream filter built on top of the specified underlying output stream.

Parameters:
out - the underlying output stream.

Methods

o write 
 public void write(int b) throws IOException
Writes the specified byte to this output stream.

The write method of FilterOutputStream calls the write method of its underlying output stream.

Parameters:
b - the byte.
Throws: IOException
if an I/O error occurs.
Overrides:
write in class OutputStream
o write 
 public void write(byte b[]) throws IOException
Writes 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.

Parameters:
b - the data to be written.
Throws: IOException
if an I/O error occurs.
Overrides:
write in class OutputStream
See Also:
write
o write 
 public void write(byte b[],
                   int off,
                   int len) throws IOException
Writes 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.

Parameters:
b - the data.
off - the start offset in the data.
len - the number of bytes to write.
Throws: IOException
if an I/O error occurs.
Overrides:
write in class OutputStream
See Also:
write
o flush 
 public void flush() throws IOException
Flushes this output stream and forces any buffered output bytes to be written out to the stream.

The flush method of FilterOutputStream calls the flush method of its underlying output stream.

Throws: IOException
if an I/O error occurs.
Overrides:
flush in class OutputStream
See Also:
out
o close 
 public void close() throws IOException
Closes this output stream and releases any system resources associated with the stream.

The close method of FilterOutputStream calls its flush method, and then calls the close method of its underlying output stream.

Throws: IOException
if an I/O error occurs.
Overrides:
close in class OutputStream
See Also:
flush, out 
All Packages  Class Hierarchy  This Package  Previous  Next  Index