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Class BufferedInputStream
java.lang.Object └ java.io.InputStream └ java.io.FilterInputStream └ java.io.BufferedInputStream
public class BufferedInputStream extends FilterInputStream
A
Author: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.Arthur van Hoff
Version:1.50, 05/03/04
Since:JDK1.0
Fields
volatile byte | buf | |
The internal buffer array where the data is stored. When necessary, it may be replaced by another array of a different size. |
int | count | |
The index one greater than the index of the last valid byte in the buffer. 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. |
int | marklimit | |
The maximum read ahead allowed after a call to the mark method before subsequent calls to the reset method fail. Whenever the difference between pos and markpos exceeds marklimit, then the mark may be dropped by setting markpos to -1. |
int | markpos | |
The value of the pos field at the time the last mark method was called. This value is always in the range -1 through pos. If there is no marked position in the input stream, this field is -1. If there is a marked position in the input stream, then buf[markpos] is the first by ... more > |
int | pos | |
The current position in the buffer. This is the index of the next character to be read from the buf array. This value is always in the range 0 through count. If it is less than count, then buf[pos] is the next byte to be supplied as input; if it is equal to count, then the ne ... more > |
Constructors
public | BufferedInputStream (InputStream in) | |
Creates a BufferedInputStream and saves its argument, the input stream in, for later use. An internal buffer array is created and stored in buf. |
public | BufferedInputStream (InputStream in, int size) | |
Creates a BufferedInputStream with the specified buffer size, and saves its argument, the input stream in, for later use. An internal buffer array of length size is created and stored in buf. |
Methods
synchronized int | available () | |
Returns the number of bytes that can be read from this input stream without blocking. The available method of BufferedInputStream returns the sum of the number of bytes remaining to be read in the buffer (count - pos) and the result of calling the available method of the ... more > |
void | close () | |
Closes this input stream and releases any system resources associated with the stream. |
synchronized void | mark (int readlimit) | |
See the general contract of the mark method of InputStream. |
boolean | markSupported () | |
Tests if this input stream supports the mark and reset methods. The markSupported method of BufferedInputStream returns true. |
synchronized int | read () | |
See the general contract of the read method of InputStream. |
synchronized int | read (byte b, int off, int len) | |
Reads bytes from this byte-input stream into the specified byte array, starting at the given offset. This method implements the general contract of the corresponding int, int) read method of the InputStream class. As an additional convenience, it attempts to read as many bytes as ... more > |
synchronized void | reset () | |
See the general contract of the reset method of InputStream. If markpos is -1 (no mark has been set or the mark has been invalidated), an IOException is thrown. Otherwise, pos is set equal to markpos. |
synchronized long | skip (long n) | |
See the general contract of the skip method of InputStream. |
Inherited methods
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