Class java.io.BufferedOutputStream - JDK 5 Documentation v1.1.8, Java 2 SDK 英文文档

All Packages  Class Hierarchy  This Package  Previous  Next  Index

Class java.io.BufferedOutputStream

java.lang.Object
   |
   +----java.io.OutputStream
           |
           +----java.io.FilterOutputStream
                   |
                   +----java.io.BufferedOutputStream

public class BufferedOutputStream
extends FilterOutputStream

The class implements a buffered output stream. By setting up such an output stream, an application can write bytes to the underlying output stream without necessarily causing a call to the underlying system for each byte written. The data is written into a buffer, and then written to the underlying stream if the buffer reaches its capacity, the buffer output stream is closed, or the buffer output stream is explicity flushed.

buf: The buffer where data is stored.
count: The number of valid bytes in the buffer.

BufferedOutputStream(OutputStream): Creates a new buffered output stream to write data to the specified underlying output stream with a default 512-byte buffer size.
BufferedOutputStream(OutputStream, int): Creates a new buffered output stream to write data to the specified underlying output stream with the specified buffer size.

flush(): Flushes this buffered output stream.
write(byte[], int, int): Writes len bytes from the specified byte array starting at offset off to this buffered output stream.
write(int): Writes the specified byte to this buffered output stream.

buf

 protected byte buf[]

The buffer where data is stored.

count

 protected int count

The number of valid bytes in the buffer.

BufferedOutputStream

 public BufferedOutputStream(OutputStream out)

Creates a new buffered output stream to write data to the specified underlying output stream with a default 512-byte buffer size.

Parameters:: out - the underlying output stream.

BufferedOutputStream

 public BufferedOutputStream(OutputStream out,
                             int size)

Creates a new buffered output stream to write data to the specified underlying output stream with the specified buffer size.

Parameters:: out - the underlying output stream.; size - the buffer size.

write

 public synchronized void write(int b) throws IOException

Writes the specified byte to this buffered output stream.

Parameters:: b - the byte to be written.
Throws: IOException: if an I/O error occurs.
Overrides:: write in class FilterOutputStream

write

 public synchronized void write(byte b[],
                                int off,
                                int len) throws IOException

Writes len bytes from the specified byte array starting at offset off to this buffered output stream.

Ordinarily this method stores bytes from the given array into this stream's buffer, flushing the buffer to the underlying output stream as needed. If the requested length is at least as large as this stream's buffer, however, then this method will flush the buffer and write the bytes directly to the underlying output stream. Thus redundant BufferedOutputStreams will not copy data unnecessarily.

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 FilterOutputStream

flush

 public synchronized void flush() throws IOException

Flushes this buffered output stream. This forces any buffered output bytes to be written out to the underlying output stream.

Throws: IOException: if an I/O error occurs.
Overrides:: flush in class FilterOutputStream
See Also:: out

All Packages  Class Hierarchy  This Package  Previous  Next  Index

Submit a bug or feature - Version 1.1.8 of Java Platform API Specification
Java is a trademark or registered trademark of Sun Microsystems, Inc. in the US and other countries.
Copyright 1995-1999 Sun Microsystems, Inc. 901 San Antonio Road,
Palo Alto, California, 94303, U.S.A. All Rights Reserved.