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