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- java.lang.Object
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- java.io.OutputStream
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- java.io.FilterOutputStream
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- java.io.BufferedOutputStream
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- All Implemented Interfaces:
- Closeable, Flushable, AutoCloseable
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.- Since:
- JDK1.0
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Field Summary
Fields Modifier and Type Field and Description protected byte[]
buf
The internal buffer where data is stored.protected int
count
The number of valid bytes in the buffer.-
Fields inherited from class java.io.FilterOutputStream
out
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Constructor Summary
Constructors Constructor and Description BufferedOutputStream(OutputStream out)
Creates a new buffered output stream to write data to the specified underlying output stream.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.
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Method Summary
Methods Modifier and Type Method and Description void
flush()
Flushes this buffered output stream.void
write(byte[] b, int off, int len)
Writeslen
bytes from the specified byte array starting at offsetoff
to this buffered output stream.void
write(int b)
Writes the specified byte to this buffered output stream.
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Field Detail
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buf
protected byte[] buf
The internal buffer where data is stored.
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count
protected int count
The number of valid bytes in the buffer. This value is always in the range 0 through buf.length; elements buf[0] through buf[count-1] contain valid byte data.
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Constructor Detail
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BufferedOutputStream
public BufferedOutputStream(OutputStream out)
Creates a new buffered output stream to write data to the specified underlying output stream.- Parameters:
out
- the underlying output stream.
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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.- Throws:
IllegalArgumentException
- if size <= 0.
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Method Detail
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write
public void write(int b) throws IOException
Writes the specified byte to this buffered output stream.- Overrides:
write
in classFilterOutputStream
- Parameters:
b
- the byte to be written.- Throws:
IOException
- if an I/O error occurs.
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write
public void write(byte[] b, int off, int len) throws IOException
Writeslen
bytes from the specified byte array starting at offsetoff
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
BufferedOutputStream
s will not copy data unnecessarily.- Overrides:
write
in classFilterOutputStream
- 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.- See Also:
FilterOutputStream.write(int)
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flush
public void flush() throws IOException
Flushes this buffered output stream. This forces any buffered output bytes to be written out to the underlying output stream.- Specified by:
flush
in interfaceFlushable
- Overrides:
flush
in classFilterOutputStream
- Throws:
IOException
- if an I/O error occurs.- See Also:
FilterOutputStream.out
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