Reads some number of bytes from the input stream and stores them into
the buffer array
b
. The number of bytes actually read is
returned as an integer. This method blocks until input data is
available, end of file is detected, or an exception is thrown.
If the length of b
is zero, then no bytes are read and
0
is returned; otherwise, there is an attempt to read at
least one byte. If no byte is available because the stream is at the
end of the file, the value -1
is returned; otherwise, at
least one byte is read and stored into b
.
The first byte read is stored into element b[0]
, the
next one into b[1]
, and so on. The number of bytes read is,
at most, equal to the length of b
. Let k be the
number of bytes actually read; these bytes will be stored in elements
b[0]
through b[
k-1]
,
leaving elements b[
k]
through
b[b.length-1]
unaffected.
The read(b)
method for class InputStream
has the same effect as:
read(b, 0, b.length)
Returns:
the total number of bytes read into the buffer, or
-1
is there is no more data because the end of
the stream has been reached.
Parameters:
-
b - the buffer into which the data is read.
Throws:
-
IOException - If the first byte cannot be read for any reason
other than the end of the file, if the input stream has been closed, or
if some other I/O error occurs.
-
NullPointerException - if
b
is
null
.
See Also:
InputStream.read(byte[], int, int)
,