22.6
java.io.ByteArrayInputStream
THE PACKAGE JAVA.IO
22.6.4
public ByteArrayInputStream(byte[] buf)
This constructor initializes a newly created
ByteArrayInputStream
 so that it
uses
buf
 as its buffer array. The initial value of
pos
 is
0
 and the initial value of
count
 is the length of
buf
.
22.6.5
public ByteArrayInputStream(byte[] buf,
int offset, int length)
This constructor initializes a newly created
ByteArrayInputStream
 so that it
uses
buf
 as its buffer array. The initial value of
pos
 is
offset
 and the initial value
of
count
 is
offset+len
.
Note that if bytes are simply read from the resulting input stream, elements
buf[pos]
 through
buf[pos+len 1]
 will be read; however, if a
reset
 operation
( 22.6.10) is performed, then bytes
buf[0]
 through b
uf[pos 1]
 will then
become available for input.
22.6.6
public int read()
throws NullPointerException,
IndexOutOfBoundsException
If
pos
 equals
count
, then
 1
 is returned to indicate end of file. Otherwise, the
value
buf[pos]&0xff
 is returned; just before the return,
pos
 is incremented by
1
.
Implements the
read
 method of
InputStream
 ( 22.3.1).
22.6.7
public int read(byte[] b, int off, int len)
throws NullPointerException,
IndexOutOfBoundsException
If
pos
 equals
count
, then
 1
 is returned to indicate end of file. Otherwise, the
number
k
 of bytes read is equal to the smaller of
len
 and
count pos
. If
k
 is posi 
tive, then bytes
buf[pos]
 through
buf[pos+k 1]
 are copied into
b[off]
through
b[off+k 1]
 in the manner performed by
System.arraycopy
( 20.18.16). The value
k
 is added into
pos
 and
k
 is returned.
Overrides the
read
 method of
InputStream
 ( 22.3.3).
690






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