THE PACKAGE JAVA.IO

java.io.BufferedInputStream

22.10

22.10 The Class

java.io.BufferedInputStream

A

BufferedInputStream

 adds functionality to another input stream namely,

the ability to buffer the input and to support the

mark

 and

reset

 methods. When

the

BufferedInputStream

 is created, an internal buffer array is created. As bytes

from the stream are read or skipped, the internal buffer is refilled as necessary

from the contained input stream, many bytes at a time. The

mark

 operation

remembers a point in the input stream and the

reset

 operation causes all the

bytes read since the most recent

mark

 operation to be reread before new bytes are

taken from the contained input stream.

public class BufferedInputStream extends FilterInputStream {

protected byte[] buf;

protected int count = 0;

protected int pos = 0;

protected int markpos =  1;

protected int marklimit = 0;

public BufferedInputStream(InputStream in);

public BufferedInputStream(InputStream in, int size);

public int read() throws IOException;

public int read(byte[] b)

throws IOException, NullPointerException;

public int read(byte[] b, int off, int len)

throws IOException, NullPointerException,

IndexOutOfBoundsException;

public long skip(long n) throws IOException;

public int available() throws IOException;

public void mark(int readlimit);

public void reset() throws IOException;

public boolean markSupported();

}

22.10.1

protected byte[] buf;

The internal buffer array. When necessary, it may be replaced by another array of

a different size.

22.10.2

protected int count = 0;

This value is always in the range

0

 through

buf.length

; elements

buf[0]

through

buf[count 1]

contain buffered input data obtained from the underlying

input stream.

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